100 software engineering interview questions and answers

Looking for a software engineer job or looking to add software engineers to your team? Consider this as your mandatory pit stop. We have put together a list of software engineering interview questions that will assist you whether you are a software developer or a recruiter looking for a software developer.

Last updated on Jun 16, 2024

Software engineering is the aspect of computer science and engineering concerned with designing, developing, testing, deploying, and maintaining software applications. Software engineers use programming knowledge and engineering principles to build operating systems and software programs.

Software engineers are always highly sought after because they are responsible for developing and designing unique products for businesses and have extensive knowledge of computer operating systems, programming languages, and software development. To help software engineers ace their next interview and technical recruiters find the best software talent, here is the list of the top 100 software engineering interview questions and answers.

Basic software engineering questions and answers


Mention some challenges of software development.

This is an important software engineering interview question that is often asked in interviews. Some of the software development challenges are:

  • The rapid advancement of technology: Technology evolves at a phenomenal pace, thus, exerting pressure on software developers to learn and adapt to maintain competitiveness.
  • Increasing demands of customers: Different customers have different needs. Software developers must understand the business concept to understand the software requirements of the customers.
  • Time constraints: Software developers need to work under strict time deadlines. For remote software developers, the challenge is even bigger as they straddle timezones. Time constraints can reduce the efficiency of software developers and end in mediocre quality software products.
  • Limited resources: Many software development companies still struggle with a lack of IT resources such as high-performing software development tools, robust computing platforms, incompetent data storage, and inefficient network capabilities. All these can reduce the overall efficiency and performance of the software development team.
  • Disagreements with software testing teams: Software development and software testing teams are often at loggerheads with each other. Major reasons for the same are the difference in team mindsets and job roles, the opposite nature of development and testing, and high work and performance pressure.
  • Coping with legacy systems: Many organizations still run with older legacy systems and this can raise the risk of security, inefficiency, and lack of technological compatibility. Thus, the modernization of legacy software is a pressing need.
  • Heterogeneity challenge: Since customer demands evolve constantly, an advanced challenge in software development is to create flexible and dependable software that can adapt to changing and future needs.


Mention the limitations of the RAD model.

The limitations of the RAD model are:

  • This model has a sufficiently high requirement of human resources to build the required number of teams.
  • The system does not work if the developers and users don’t stay committed.
  • If the system is not correctly modularized, it may lead to problems in building components.
  • If the technical risk is high, this model is not applicable.

When answering software development interview questions about the limitations of certain models, you can also talk about times when you faced such limitations and how you coped with them.


What are the steps involved in software development?

The following steps are needed for software development:

  • Brainstorming and planning: This stage determines the purpose and functions for which the software program must be developed.
  • Project team analysis: This stage determines the team members, tools, and time frame required for the project.
  • Design stage: At this stage, the designated software development team designs the program.
  • Development stage: This is the stage where the final functionality of the software is developed.
  • Quality assurance and testing: This is the penultimate, but perhaps the most important stage before finally launching the program. Here, any bugs, defects, or errors are identified and rectified.
  • Launch: This is when the program is finally installed and launched for the intended users.


Mention the benefits of Smoke-testing.

Some of the benefits of Smoke-testing are listed below:

  • It minimizes the risk of integration
  • It improves the end-product quality
  • It simplifies the diagnosis and correction of errors
  • It makes assessing progress easy


Talk about equivalence partitioning.

Equivalence partitioning is a method for testing software where the input data of a software unit is divided into partitions containing equivalent data. These partitions help in deriving the test cases, which, in principle, must cover each partition at least once. Through partitioning, the test cases can detect classes of errors, and hence reduce the number of test cases to be developed. Since the number of test cases reduces, the time required for software testing reduces too. Though this method is usually applied to a tested component’s inputs, in some rare cases it could also be applied to the outputs.


Differentiate between alpha and beta testing.

These are two types of acceptance tests.

  • Alpha test: Alpha tests are tests where the customer assesses a full-version software under the developer’s supervision. This kind of testing happens at the developer’s site.
  • Beta test: Beta tests are tests where the customer assesses a version of the software without the developer’s supervision. This kind of testing happens at the customer’s site.


Mention the types of static testing tools.

The three types of static testing tools are:

  • Code-based: For these testing tools, the source code functions as the input and they use that to generate the test cases.
  • Specialized: In these testing tools, the language is used to write detailed test specifications for every test case.
  • Requirement-based: These testing tools design the test cases as per the user requirements.

For such a question in the software developer interview, remember to add instances from personal experience.


Mention the different types of software maintenance.

The different types of software maintenance are as follows:

  • Corrective: Corrective maintenance is used for correcting the faults in the software.
  • Adaptive: Adaptive maintenance helps the software to adapt to changes in its environment.
  • Perfective: Perfective maintenance helps in changing or improving the system to meet the new requirements.
  • Preventive: Preventive maintenance refers to the alterations made to enhance future maintainability.


What are the software engineering categories?

The categories of software engineering include:

  • Scientific software: This software provides an engineering solution for specific engineering tasks. Examples include CAM and CAD software, AutoCAD, etc.
  • Embedded software: This refers to software used in control and instrumentation appliances such as televisions, satellites, and washing machines.
  • AI software: These types of software are designed for pattern recognition, advanced systems, and artificial neural software used in machine learning algorithms and natural language processing.
  • Networking and web development software: This provides a medium in communication between computer systems, software, and data storage systems. Examples include web browsers, email clients, and file transfer protocol (FTP) software.
  • System software: This category includes software that provides the core functionality for other digital applications. Examples include operating systems like Windows and Linux, device drivers, and utility programs.


How would you define a framework?

A framework is a platform for developing and deploying software. It outlines how software components relate to one another and details the development process. It is a structured and standardized set of tools, libraries, and components that provide a foundation for building software applications.

Frameworks are designed to facilitate the development, maintenance, and scalability of applications by offering a pre-built structure for organizing code, handling common tasks, and interacting with other systems.


Differentiate between computer software and a computer program.

A computer program is a subset of computer software. A computer program contains programming instructions to carry out tasks, while computer software is a collection of computer programs.

Computer software might contain programs, libraries, APIs, components, and frameworks. It is a broad term encompassing any software designed to run on a computer system, including operating systems, application software, utilities, device drivers, and system softwares.

On the other hand, a computer program is a set of instructions written in a specific programming language and executed by a computer. It can be a single application or a group of related applications that perform a specific function or set of functions.


What is the full meaning of SDLC?

SDLC stands for Software Development Life Cycle. It is a structured approach to software development that involves various stages and activities, from planning and analysis to implementation and maintenance. The process enables the creation of high-quality software within the shortest possible time frame.


List different SDLC models.

Software Development Life Cycle (SDLC) is a planned methodology of building software to ensure quality and reliability in the software built. Here is a list of some popular SDLC models:

Waterfall model: In this SDLC model, the entire process is divided into various phases where the outcome of one phase becomes the input of the next phase.

Incremental model: It is a series of separate SDLC cycles where requirements are grouped and addressed in each cycle.

V-model: It plans the phases in parallel with verification phases on the left side and validation phases on the right side of the V-shaped diagram.

Agile Model: Agile development model promotes continuous collaboration between development and testing teams throughout the development process.


What is debugging?

Debugging is the process of identifying and resolving defects, errors, and faults in software applications. A bug is an error or fault in a software application that causes it to behave unexpectedly or incorrectly. Debugging begins soon after the software code is written and continues through the subsequent stages of software development. The goal is to create a defect-free or error-free software product for market release.


What is the Waterfall method?

The Waterfall approach is a linear and consecutive downward development SDLC approach. In this methodology, the customer and stakeholder requirements are collected at the beginning of the project.

After that, a sequential project plan covers all those requirements. And, hence the Waterfall method is so named as each phase of the project downpours into the next like a waterfall.


What are some use cases of SDLC?

SDLC is useful in various scenarios, including:

  • Developing new software applications or systems from scratch
  • Updating or modifying existing software
  • Maintaining software and ensuring its longevity
  • Ensuring software quality and reducing the risk of defects
  • Managing and controlling project timelines and costs


What is software engineering?

Software engineering is a branch of engineering that focuses on developing and maintaining high-quality software systems. It involves applying engineering principles and methods to design, develop, test, deploy, and maintain software. Software engineering plays a vital role in the current digital age, where software systems are a ubiquitous part of our daily lives, from smartphones to cars, healthcare systems to financial services.

Software engineering involves a range of activities, such as requirements gathering, software design, coding, testing, documentation, and project management. Effective software engineering involves not only technical skills but also collaboration, communication, and problem-solving. Software engineers work with other professionals such as product managers, designers, and quality assurance teams to deliver high-quality software systems that meet user needs.


What are the targeted accomplishments of a software engineering model?

A software engineering model is designed to achieve several objectives, including:

Providing a framework for software development: A model helps in creating a systematic approach to software development, which can be used to plan, design, develop, test and maintain software.

Enhancing software quality: A software engineering model helps in identifying and addressing software quality issues early in the development process, which helps in reducing the cost of development and maintenance, and ensures that the software meets the desired standards of quality.

Improving communication: A model provides a common language and understanding between software developers, managers, and stakeholders, which helps in improving communication and collaboration throughout the development process.

Facilitating project management: A model helps in managing the development process by providing a clear roadmap of activities, roles, and responsibilities, which helps in ensuring that the project is completed on time, within budget, and with the desired quality.

Enabling software reuse: An engineering mode also promotes the reuse of software components, which helps in reducing the time and cost of development and ensures consistency and quality across projects.


What are internal milestones in software engineering?

Internal milestones are measurable and important attributes of processes. They are standard systematic procedures that indicate that the engineers are on the right path. These milestones can be used to assess the development team's progress, identify issues and risks, and make necessary adjustments to the project plan. They can be related to various aspects of the project, such as completing a specific feature, testing and debugging the code, or reaching a certain level of performance or functionality.


Mention some characteristics of software.

Software exhibits various characteristics that make it a unique product in the market. Some of the most notable features include tailor-made design to fit specific user requirements, usability, functionality, maintainability, and reliability. These characteristics are essential to ensure that the software performs as intended, is user-friendly, can be easily updated and repaired, and functions without failure or errors.


What is a software process?

A software process refers to a set of systematic activities and procedures that enable the development and maintenance of software applications. The key activities typically included in a software process are requirements gathering, design, implementation, testing, and maintenance. These activities provide a framework for managing the entire software development life cycle.The software process can be customized to suit the specific requirements of a project or organization, and it can be refined and improved over time to optimize performance and efficiency.


What are the factors to be taken into account during the construction of a system model?

System models are useful tools for understanding complex systems and identifying areas for improvement. When constructing a system model, there are several elements to consider, including:

  • Preferences: This refer to the goals or objectives that the system is designed to achieve.
  • Assumptions: These are the underlying beliefs or ideas about how the system works.
  • Limitations: These factors can constrain the system, such as time or resources.
  • Constraints: These are the specific conditions that the system must operate under, such as legal or regulatory requirements.

By considering these elements, developers and stakeholders can ensure that the model accurately reflects the system and can be used to make informed decisions about improvements or changes.


List some project management tools used in software engineering.

Software engineering project management involves a variety of tools, including Jira, Trello, Asana, and more. These tools offer features such as task assignment, progress tracking, Gantt charts, team collaboration, and resource allocation. Other useful project management tools for software engineering include Agile methodologies, Scrum boards, and Kanban boards.


What is the Rapid Application Development (RAD) model?

The RAD model is an iterative and prototyping approach to software development that emphasizes less time spent on traditional planning phases and more on software development. It involves a series of smaller development cycles, including planning, design, construction, and testing, with a focus on quick delivery of functional software to clients and stakeholders. The RAD model incorporates feedback from end-users and stakeholders to refine and improve the software.


What are the different phases of SDLC?

The Software Development Life Cycle (SDLC) consists of several phases that depend on the project's requirements, but the typical phases are:

Requirement Gathering: Gathering information from stakeholders and defining the scope of the project.

System Analysis and Design: Analyzing requirements and designing a system architecture that meets those requirements.

Coding: Implementing the design by writing code in a specific programming language.

Testing: Testing the software to ensure that it works as expected and meets the requirements.

Deployment and Maintenance: Deploying the software to production and maintaining it by fixing bugs, adding new features, and upgrading it over time.


What are some disadvantages of the classic life cycle model, also known as the Waterfall model?

The Waterfall model may not be the best choice for long or continuous projects due to the lack of certainty and high amount of risks involved. It may also present challenges for dynamic or complex projects, as well as those that are object-oriented.


Mention a few disadvantages of the incremental process model.

Some of the disadvantages include:

Complexity: As the number of increments increases, managing and coordinating multiple increments can become challenging.

Lack of overall planning: Since the project is divided into increments, the overall planning may be less detailed than other models. This may lead to difficulty in identifying dependencies and conflicts between increments.

Cost: The incremental model can be expensive as it requires constant testing and integration of different increments.

Time-consuming: The incremental model can be time-consuming as each increment requires design, development, testing, and integration phases. This can lead to longer project timelines.

Difficulty in accommodating changes: Changes to requirements or design in one increment can have a significant impact on subsequent increments, making it difficult to accommodate changes.


List some advantages of the incremental process model.

The advantages of the incremental process model include the following:

Incremental resource deployment: Instead of deploying all resources at once, they can be gradually introduced as the project progresses, reducing the risk of resource waste.

Low initial delivery cost: Since each iteration focuses on delivering a specific functionality, the initial delivery cost is relatively low

Ease of error recognition: With incremental development, errors are easier to recognize since each iteration is focused on a specific functionality. This means that developers can identify and address errors early on in the development process, reducing the risk of critical issues arising later on.

Offers more flexibility: By delivering working software in increments, developers can make changes as necessary, enabling them to respond quickly to changing requirements and stakeholder feedback.

Easily tested and debugged: Each iteration is focused on a specific functionality, making it easier to test and debug.


What are some disadvantages of the spiral model?

The spiral model is a software development process that involves repeated cycles of risk analysis, design, and development. Some disadvantages of this model are:

Costly: The spiral model can be expensive to implement due to the need for a high level of expertise in risk analysis and the potential for additional iterations.

Expertise required: The risk analysis involved in this model requires a high level of expertise, which can be challenging to find.

Not suited for small projects: The spiral model is best suited for large and complex projects, making it less suitable for smaller projects.

Critical risk analysis: The project's success depends heavily on the accuracy and effectiveness of the risk analysis, making it a critical factor for the success of the project.


What is a software scope?

In software development, the term software scope refers to the extent and boundaries of the software's features and functionalities that are defined during the planning stage of the project. It involves identifying what the software should do and what it should not do, which is critical to ensuring that the software meets the business requirements and user expectations.

The software scope includes various elements such as the project's budget, resource allocation, and time allocation.


What type of data is passed through the HTTP headers?

HTTP headers allow the client and server to pass additional information through the request or response. This information can include authentication credentials, data type specifications, cache instructions, connection details, and information about the client and server. Non-standard headers can also be used to pass custom data as needed


What are some advantages of evolutionary prototyping?

The advantages of this type of prototyping include the following:

Early and continuous feedback: With each iteration, stakeholders can provide feedback on the prototype, allowing the system to evolve and meet the project needs better.

Better risk management: The system is developed incrementally, so potential risks can be identified early and addressed before they become major issues.

Flexibility: The system can adapt to changing requirements, as each iteration allows for modifications and enhancements to be made.

Time and cost-effectiveness: The system can be developed and tested in smaller increments, reducing the overall development time and cost.


What are some disadvantages of evolutionary prototyping?

The disadvantages of evolutionary prototyping include the following:

Time-consuming: Evolutionary prototyping can be a time-consuming process because it involves multiple iterations, testing, and refinement.

Lack of structure: This approach does not have a well-defined structure, which can lead to the development of a system that lacks coherence and consistency.

Cost: Developing multiple prototypes can be expensive, particularly if the development team does not have a clear understanding of the project requirements.

Scope creep: The iterative nature of evolutionary prototyping can lead to scope creep, where additional features are added to the software without considering their impact on the overall project goals and timeline.


What is software prototyping?

Prototyping is an iterative process in which developers create a preliminary software application version to test its functionality, user interface, and other features. The prototype can gather feedback from stakeholders, identify potential design flaws, and refine the software development process.


How can project execution be measured?

Project execution can be measured by milestone checklists, activity monitoring, and status reports. These methods help project managers track the project's progress and identify any potential issues that may arise during the project execution. Additionally, they provide a clear picture of the project's status and allow stakeholders to make informed decisions based on the information provided by these methods.


What are some evolutionary process models?

Some of evolutionary models include:

  • Prototype model
  • Spiral model
  • Incremental model
  • Concurrent model


What are the different techniques in rapid prototyping?

The different types of rapid prototyping techniques include:

  • Mockups & wireframes
  • Automatic code generation
  • 3D printing
  • Rapid Application Development (RAD)


What is coupling?

Coupling in software engineering defines interdependence between two or more software modules. It shows how closely related or connected two modules are. High coupling can make a software system more difficult to maintain and modify, while low coupling can make it more modular, flexible, and easier to work with.


What is cohesion?

Cohesion indicates the bond strength between elements in a module. It measures the relationship strength between the data of a class/methods and the unifying factor or purpose the class serves. High cohesion means that the elements within a module are closely related and work together towards a common goal, while low cohesion implies that the elements are loosely related and do not have a clear or unified purpose.


What is Agile SDLC?

Agile software development life cycle is an iterative process of software development based on an adaptive and decision-making approach, using continuous design improvements to produce better software.


What are the different types of coupling in software engineering?

Listed below are the different types of coupling in software engineering:

  • Stamp
  • Data
  • Content
  • Common
  • External
  • Control


What are the different types of cohesion in software engineering?

The following are the different types of cohesion in software engineering:

  • Sequential
  • Functional
  • Communicational
  • Temporal
  • Procedural
  • Logical
  • Coincidental


What are some advantages of cohesion?

Some of the advantages of cohesion include:

  • Reduces complexity of modules
  • Increases module reusability
  • Improves system maintainability
  • Improves testabilty
  • Creates balance between coupling and unit complexity


What is a COCOMO model?

This is an acronym for Constructive Cost Model. COCOMO model is a procedural regression model that calculates the estimated effort, time, and cost required to develop the software.The model considers various factors such as the size of the project, complexity, required software reliability, team experience, and development environment to provide a reliable estimate of the software development effort.


How would you describe a state transition diagram?

A state transition diagram describes the various states an object can possess and the events under which such an object can transition. It consists of nodes, which represent the states, and directed edges, which represent the transitions. It is commonly used in software engineering to model the behavior of a software system or a specific module within a system.


Explain refactoring.

Refactoring is the process of optimizing the software system without changing the software’s functionality or code behavior. It is typically done to improve the code's readability, reduce complexity, remove duplication, and increase the code's overall quality. Refactoring is a common practice in software development and is often done to improve a codebase's long-term maintainability and scalability.


What is smoke testing?

Smoke testing is a preliminary software testing in which software is tested to reveal stability faults or failures. This is normally done to confirm the quality assurance team to proceed with the software testing. Smoke testing typically involves a set of simple and crucial tests that verify the basic features of the software, and any critical issues found during smoke testing are addressed before proceeding to more comprehensive testing.


What are the differences between tags and branches?

A tag is a pointer to a specific commit in Git history. Tags are generally used to mark a specific release or version of the codebase. Tags are immutable, meaning that they cannot be changed once created.

On the other hand, a branch is a parallel line of development in Git that allows developers to work on new features or make changes to the codebase without affecting the main codebase. Branches are mutable, which means they can be updated and modified as new commits are added.


In your opinion, which of testing frameworks is best for testing code quality?

There are several testing frameworks available that can help to test code quality, each with its own strengths and weaknesses. Here are some popular options:

JUnit: JUnit is a widely used testing framework for Java applications. It is designed to help developers write and run repeatable tests to ensure their code works as expected. JUnit can be used to test individual methods or entire classes, and it provides a variety of built-in assertion methods to help developers check the correctness of their code.

PyTest: PyTest is a popular testing framework for Python applications. It is designed to be simple and easy to use while also providing powerful features for testing complex systems. PyTest supports a wide range of testing scenarios, including unit testing, functional testing, and integration testing.

NUnit: NUnit is a testing framework for .NET applications. It provides various tools for testing different types of applications, including desktop applications, web applications, and mobile applications. NUnit supports a wide range of testing scenarios, including unit testing, integration testing, and acceptance testing.

Mocha: Mocha is a testing framework for JavaScript applications. It provides a simple, flexible syntax for writing tests and supports synchronous and asynchronous testing scenarios. Mocha can be used to test a variety of JavaScript frameworks and libraries, including Node.js, React, and Angular.


What is software architecture?

Software architecture is the design and structure of a software system, including its components, relationships, and principles. Examples of software architecture include layered, client-server, or microservices. It serves as a blueprint for the development, deployment, and maintenance of the system and is crucial for ensuring scalability, maintainability, and reliability.


List the methods used for determining the size of a software product.

Some of the methods that can be used to determine the size of software are:

Function points: It is a method that measures the functionality provided by the software product based on user requirements.

Delivered code: It measures the size of the code delivered as part of the software product.

Lines of Code (LOC): This method involves counting the total number of lines of code written to develop the software product.

Story Points (SP): This method involves estimating the size of the software product based on the complexity of its features and user stories.


What does the acronym CASE stand for?

CASE stands for Computer-Aided Software Engineering. It uses computer-based tools and techniques to aid in software development. These tools can assist developers in analyzing, designing, coding, testing, and maintaining software systems.


What are function points?

Function points are important features that can be used to quantify the functionality provided by the software product. Function points are calculated based on various factors, such as inputs, outputs, inquiries, files, and interfaces, which are assessed to determine the size and complexity of the software.


How would you differentiate between Queue and Stack?

The main difference between a queue and a stack is their principle of operation. A queue is a data structure that works on the principle of First-In-First-Out (FIFO), which means that the element that is inserted first is the first one to be removed. On the other hand, a stack is a data structure that works on the principle of Last-In-First-Out (LIFO), which means that the element that is inserted last is the first one to be removed.

In a queue, elements are inserted at the rear end and removed from the front end. In contrast, in a stack, elements are inserted at the top and removed from the top. Another key difference is that queues are used for breadth-first search and sequential processing, whereas stacks are used for depth-first search, recursive programming, and backtracking.

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Intermediate software engineering interview questions and answers


Which of the SDLC models would you recommend as the best?

The best SDLC model is the Agile model because it combines functionalities of iterative and incremental models and is the most widely used one. The Agile SDLC model offers several advantages, including flexibility, faster time to market, optimized quality, and increased collaboration between teams.

However, here it is worth noting that it’s important to evaluate the specific needs of each project and organization and choose the SDLC model that best fits those needs.


What are the different phases of the Waterfall model?

The Waterfall model is a linear, sequential approach to software development that is divided into distinct phases. The phases of the Waterfall model are as follows:

  • Requirements gathering and analysis
  • Design
  • Implementation
  • Testing and integration
  • Deployment
  • Maintenance


What is Quality Function Deployment (QFD)?

Quality Function Deployment (QFD) is a structured approach that helps organizations interpret customer requirements and translate them into engineering specifications. QFD ensures that the product design and development align with the customer's needs, resulting in a product that is more likely to satisfy the customer and succeed in the market.


What would you consider to be some benefits of software prototyping?

Some of the benefits are listed below:

  • It allows easy management of the system, design, and final product
  • It offers a platform for creating system specifications
  • It increases the system usability
  • It reviews and improves the product quality


How would you define change control?

Change control is a systematic approach to managing software changes and configurations. It is a critical function that ensures all changes to software follow organizational guidelines and rules. The process typically involves identifying proposed changes, evaluating their impact, obtaining approvals, implementing them, and monitoring their effects.

The ultimate goal of change control is to guarantee consistency, control, and transparency in software changes, while minimizing disruption to systems and maintaining their integrity and reliability.


What equation would you use to calculate the cyclomatic complexity of a program?

The cyclomatic complexity can be calculated using the graph theory’s formula: V(G) = e – n + 2 of the Cyclomatic Complexity Theorem. Here "e" is the number of edges in the program's control flow graph, and "n" is the number of nodes in the graph.


What are some prototyping methods?

There are four main prototyping methods, including:

Extreme prototyping: This type of prototyping is mostly used for web applications and contains three distinct stages, namely, low, mid, and high-fidelity models.

Throwaway prototyping: This method intends to build the prototype into something other than a working system. Thus, it is discarded after use.

Incremental prototyping: This method creates several prototypes, which are then assembled into a final working system once proven to satisfy consumers’ needs.

Evolutionary prototyping: As the name indicates, this prototype is built to scale, evolve, and be refined as the development progresses.


What are blocking calls?

Blocking calls, also known as synchronous calls, refer to situations in which the execution of a program is paused until a certain operation is completed. In the context of JavaScript, this means that the code execution is blocked until a non-JavaScript operation, such as a network request or a file I/O operation, is finished.

Blocking calls can have significant performance implications, as they can cause the entire application to freeze while waiting for the operation to complete. To avoid this, developers can use asynchronous programming techniques, such as callbacks or promises, which allow the code to continue executing while waiting for the operation to complete.


What do you understand about functional programming?

Functional programming is a programming paradigm that uses functions to solve problems. In functional programming, functions can be passed as arguments to other functions, returned as values from functions, and stored in data structures.

One of the key characteristics of functional programming is the emphasis on immutability, meaning that once a value is defined, it cannot be changed. Instead of changing existing values, functional programming typically creates new values based on existing ones.


What are non-blocking calls?

Non-blocking calls are asynchronous operations that allow programs to continue executing without waiting for a response from a particular function or task. By freeing up resources and allowing for parallel execution, non-blocking calls improve the responsiveness and performance of applications. This approach is widely used in modern programming languages to optimize system utilization and deliver seamless user experiences.


How would you define a system context diagram?

A system context diagram is a high-level view of a system that defines its boundaries and indicates the entities that interact with it. It is a visual representation in software engineering that provides an overview of the entire system and is similar to a block diagram.


What are CASE tools, and list some examples?

CASE (Computer-Aided Software Engineering) tools are software applications used to automate and improve various activities involved in the Software Development Life Cycle (SDLC). They assist in various phases of software development such as analysis, design, coding, testing, and maintenance.

Some examples of CASE tools are:

  • Software design tools (Rational Rose, Visual Paradigm, Enterprise Architect.)
  • Requirement analysis tools (CaliberRM, DOORS, RequisitePro)
  • Code generation tools (CodeSmith, CodeCharge Studio, JCodeModel)
  • Integrated development environment (IDE) (Eclipse, Visual Studio, NetBeans)


In software, what are functional and non-functional requirements?

Functional requirements refer to the features and standards required of the software by the users. These features are expected to be a part of the final product and they must be incorporated into the software during the development process.

The non-functional requirements, on the other hand, are concerned with the quality constraints and checks that a software system must satisfy. The non-functional requirements are associated with user interface, security, performance, etc.


What is ERD, and how would you describe it?

ERD stands for Entity-Relationship Diagram. An ERD is a visual representation of the relationships between different entities or objects within a system or domain. It is primarily used in database design to model the relationships between tables and their attributes.


What is the primary use of User Interface prototyping?

User Interface (UI) prototyping is primarily used to create a visual representation of a software product's user interface design. It allows designers and developers to create a mockup or working model of the user interface that can be tested and refined before the final product is developed.

By creating a user interface prototype, designers and developers can gain valuable insights into how users interact with the system and identify potential usability issues early in the development process. This, in turn, helps to ensure that the final product is more user-friendly and meets the needs of its intended audience.


What is requirement engineering?

Requirement engineering or RE can be defined as defining, documenting, and maintaining the requirements in the software engineering process. It involves understanding the needs and expectations of stakeholders, translating them into functional and non-functional requirements, and ensuring that the software system meets those requirements throughout its lifecycle.


Define the purpose of a timeline chart.

A timeline chart serves the purpose of visually explaining the sequence or process of events of a project to get insights into the essence of that project. It allows for a quick understanding of the order of events and their relationship to one another.

A timeline chart is often used as a project management tool to track progress and deadlines, and it can also be used for educational or informational purposes.


What is an SRS?

SRS stands for Software Requirement Specification and it helps users determine if the software meets their needs. It is a representation of the software assessed by the users.

The SRS is typically created at the beginning of the software development process and serves as a guide for the rest of the development process. The SRS describes the software system's features, functionalities, and characteristics in detail, including user interfaces, inputs, outputs, and performance requirements.


Kindly explain the bottom-up and top-down design models.

Bottom-up and top-down are two common design models used in software engineering. The bottom-up approach involves starting with specific and smaller components and then gradually combining them to create larger systems. For example, a software engineer might start by building and testing individual functions or modules before integrating them into a complete system.

On the other hand, the top-down approach starts with a generalized view and then breaks it down into smaller, more specific components. In this model, the design begins with a high-level overview of the system's goals and functions, and then gradually drills down into the details. For instance, a software engineer might start by identifying the overall functions that a system needs to perform, and then break them down into smaller tasks and subtasks.


What is the major difference between object-oriented design (OOD) and component-oriented design (COD)?

The major difference between OOD and COD is that OOD splits complex systems into smaller, manageable units and can be re-operated with lesser complexity. However, COD deals with the decomposition process to create sections or software components, creating independent modules which establish various functionalities across the software system.


Describe the testing process.

There are five basic steps involved in testing, and they are:

  • Unit testing: Testing of individual elements
  • Module testing: Testing of a similar cluster of independent elements
  • Sub-system testing: Different modules are integrated and tested as a sub-system in this step.
  • System testing: Testing of the entire system
  • Acceptance testing: This involves the testing of the system to see if it conforms to the user’s requirements


In software development, what is a baseline?

In software development, a baseline is a milestone that indicates the completion of singular or multiple software deliverables. This helps to regulate vulnerability that can spiral the project out of control or increase damage. Baselines can include things like code, documentation, and other aspects and are often used to assess progress, track changes, and manage version control.


How can you differentiate between validation and verification?

Validation is the process of determining if a software project meets the specified quality standards.

On the other hand, verification is the process that ensures that a software product meets its stated objectives in terms of functionalities.


What is the difference between fixed website design and fluid website design?

Fixed website designs use fixed pixel widths for easy launching and running but are less user-friendly. Fixed website designs have a set width that remains the same regardless of the size of the screen or browser window. This means that the design may appear differently on different screen sizes or resolutions, and users may have to scroll horizontally to view the content on smaller screens.

However, fluid websites utilize percentages as relative indicators for widths. This allows the content to expand or contract to fit the screen, creating a more flexible and user-friendly experience. However, designing a fluid layout can be more challenging and requires careful consideration of the content and how it will adjust to different screen sizes.


Differentiate between functional and object-oriented programming.

In functional programming, the primary focus is on functions, which are mathematical mappings between inputs and outputs. In this paradigm, functions can be passed around as arguments to other functions, returned as values, and stored in variables. This allows for a highly modular and composable style of programming.

In contrast, OOP focuses on objects and instances of classes that encapsulate data and behavior. This allows for the natural modeling of real-world entities and their interactions. Objects communicate with each other by sending messages, which invoke methods defined in their respective classes.

Functional programming supports Python, Javascript, Scala, and Haskell. The languages supported by object-oriented programming include Python, Java, C++, Lisp, and Perl.

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Advanced software engineering interview questions and answers


What are software metrics?

Software metrics are quantifiable measures used to evaluate specific aspects of software development. They are numerical measurements used to assess the quality, efficiency, and effectiveness of software development processes and products. Some common examples of software metrics include code complexity, code coverage, and defect density. By measuring these metrics, software development teams can identify areas for improvement, monitor progress, and make data-driven decisions to optimize their development processes and products.


What are some benefits of software metrics?

Software metrics offer several benefits and a few are listed below:

  • Workload reduction
  • Cost reduction
  • Increase in ROI
  • Identification of improvement areas


What are the DORA research program's key metrics to measure software performance?

The DORA research program, which stands for DevOps Research and Assessment, has defined several metrics to measure software delivery performance. These metrics include Mean Time To Restore (MTTR), Deployment Frequency, Change Lead Time, Change Failure Rate, Test Automation Percentage, and Change Fail Percentage among others.


How would you differentiate between black box testing and white box testing?

Black box testing is a high-level testing method that involves testing the software without knowledge of the internal workings of the program. The goal of black box testing is to ensure that the software meets its functional and non-functional requirements.

On the other hand, white box testing is a testing method that involves testing the internal workings of the software or its architecture. White box testing is typically carried out by developers who have knowledge of the code and its implementation. The goal of white box testing is to identify defects in the code and to ensure that the software is working as expected at the code level.

Overall, black box testing focuses on the behavior of the software while white box testing focuses on the implementation of the software. Both methods are important for ensuring that software is of high quality and meets the desired requirements.

Learn more about black box testing vs. white box testing.


What is the need for concurrency in software, and how is it done?

Concurrency is a concept that allows the software to carry out multiple tasks simultaneously and seamlessly. Programming languages such as Java and C++ achieve concurrency through multithreading. However, other programming languages such as Python and JavaScript also support concurrency and have their own techniques for achieving it, such as asyncio and web workers.


How would you define Software Configuration Management (SCM)?

Software Configuration Management (SCM) is the process of identifying, organizing, and controlling changes to software and related documents throughout the software development lifecycle. SCM ensures that changes to code and related documents are tracked, reviewed, and approved by the appropriate stakeholders to prevent errors and maintain consistency across versions. SCM plays a critical role in software development by providing a systematic approach to managing changes to software and related documentation.


Differentiate between Quality Assurance and Quality Control in software engineering.

Commonly referred to as QA and QC, QA is a preventive process of ensuring that the end software product meets the required standards, and it applies to the full software development cycle. It involves activities such as requirement analysis, design review, code review, and process improvement.

On the other hand, QC refers to the corrective process of ensuring that a software production process meets the required standards to produce the required products. This is employed in the testing phase. The primary goal of QC is to verify that the final product meets the quality standards and requirements set by the stakeholders.


Why is modularization important in software engineering?

Modularization is a method used to divide a software system into different discrete modules for their independent operations. Modularization is a crucial aspect of software engineering as it helps achieve better code organization, maintainability, and reusability.

When software is broken down into smaller modules, each module can be designed, tested, and maintained independently. This helps in identifying and fixing bugs easier, improving code quality, and reducing development time.


What does 0-level data flow diagram refer to?

The 0-level data flow diagram (DFD), also known as context diagram, is the highest level of abstraction. All the inputs and outputs of the system are shown in this diagram, along with the various entities that interact with the system.


To prevent software from getting into trouble, what process model will you use?

I will use the clean room engineering model because it detects and eliminates defects before the software worsens. The clean room engineering model is one approach to software development that emphasizes rigorous testing and verification to ensure the correctness and reliability of the software.

Other process models that can also help prevent software issues include agile, waterfall, iterative, and incremental development.


Software analysis and design tools are important in software development. What software analysis and design tools would you recommend?

The following software analysis and design tools are highly recommended:

  • Data dictionary
  • Structured charts
  • Data flow diagrams
  • Hierarchical Input Process Output diagrams
  • Entity Relationship Diagrams and Decision Tables
  • Use case diagrams
  • Unified Modeling Language (UML)


How would you differentiate between an EXE and DLL?

EXE is a program that can be executed. This means an EXE file contains encoded steps of instructions that can be executed when a user clicks on the file icon. A DLL, on the other hand, is a code library that different programs can dynamically use simultaneously.


What are strong and weak typing, and which would you recommend?

Weak typing checks the types of variables in a system at run time, while strong typing checks the types of variables at compilation time. Strong typing is recommended because it reduces bugs. However, it can also make the code more rigid and harder to modify. Eventually, the choice depends on your project requirements.


Why do you think using catch (exception) is a bad idea?

I think it is a bad idea because of these reasons:

  • It cannot be used when exception types are not known
  • Because if there are no variables defined, the exception is hard to read
  • It can lead to unexpected behavior if the code is modified later and new exceptions are introduced, as they may also be caught by the catch (exception) block and handled inappropriately.


Why do we use polymorphism in software engineering?

Polymorphism allows objects of different classes to be treated as if they are objects of the same class. This means that the same method can be called on different objects, and each object will respond in a way that is appropriate to its class. This enables code to be more flexible, reusable, and easier to maintain.


How would you describe a responsive web design?

Responsive web designs are just websites with responsive designs that use media queries to focus and aim at breakpoints that scale images, adjust the layout, and wrap texts such that websites can easily adjust to fit any screen size.


Would you choose a microservice approach or a monolithic one for app development? State the reason(s) for the answer.

I would choose a microservice approach. This is because building an app with a microservice approach gives it a combination of various independent services that can act robustly without one another. This gives the app faster performance, higher flexibility, and more efficiency.


What are web workers in HTML5, and why do they matter in software engineering?

Web workers are JavaScripts that run independently in the background of an HTML5 page without affecting the page's performance.

They matter in software engineering because it helps in multithreading simulation in JavaScript. This means that they enable the simultaneous run of different scripts. This is particularly useful for handling computationally-intensive tasks, such as processing large amounts of data, without causing the page to freeze or become unresponsive.


Have you worked with microservices architecture? If so, can you describe the challenges you faced and how you overcame them?

Yes, I got a chance to work with microservices architecture in my previous role. One of the major challenges we faced was managing the communication between microservices. As the system grew in complexity, we had to ensure that the microservices could communicate with each other effectively and efficiently.

To overcome this challenge, we implemented an API gateway, which acted as a single entry point for all requests to the microservices. This helped us manage the communication between microservices by routing requests and responses between them. We also implemented a service registry, which allowed us to keep track of all the microservices in the system and their endpoints.

Another challenge we faced was ensuring the scalability of the system. As the number of microservices grew, we had to ensure that the system could handle the increased load. To address this, we implemented containerization using Docker, which allowed us to isolate each microservice and scale them independently.


Explain the big-O notation in the simplest words.

The big-O in software engineering is used to explain the complexity of an algorithm. The big-O notation analyzes the efficiency of an algorithm as the input tends to the largest possible input size by explaining the worst-case scenario. It can be used to describe the time for execution or memory space occupied by the algorithm.


If a non-technical person asked you the meaning of an API, how would you explain it?

Firstly, API is an acronym for Application Programming Interface. It is simply an interface that allows two programs or systems to communicate. It does the job of taking the request from one system to another and then delivering the response. It enables developers to access the functionality of another system or application without having to understand how it works internally.

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Wrapping up

This content is catered towards software developers applying for engineering roles and technical recruiters looking to hire software engineers. It will help software engineers prepare for their next interview using the latest software engineering interview questions and answers.

On the other hand, it gives the technical recruiters a deep insight into the useful questions for evaluating each software engineering candidate. For a better alternative, technical recruiters can opt for an easier and more convenient way of hiring the world’s best remote software engineers via Turing. Also, software engineers can sign up with Turing, pass technical tests and interviews, and get matched with top U.S. companies.

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