Top 10 Microservices interview questions and answers for 2022

You've come to the perfect spot if you're trying to build a team of amazing Microservices developers for your company or if you're looking to start a rewarding career as a Microservices developer. Whether you are a recruiter or a developer, we will offer you a carefully created list of 10 crucial Microservices interview questions for expert Microservices developers, which will help you discover your ideal fit.

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Microservices architecture is a means of designing a large-scale application in the form of discrete modules that function independently yet together account for the full business application. This service is rapidly being used by businesses to create enterprise solutions. There is a growing need for cloud solutions since this is based on simple, modular services.

As a developer, facing a Microservices job interview is a difficult task. However, your Microservices interview could simply be a stroll in the park with our carefully written Microservices interview questions, which cover the bulk of the fundamental principles as well as practical applications. With these Microservices interview questions, meant for recruiters, you can find the ideal advanced Microservices developer for your organization.

Microservices interview questions and answers

1.

What are the main components of Microservices?


Microservices consists of:

  • Containers, Clustering, and Orchestration
  • IaC [Infrastructure as Code Conception]
  • Cloud Infrastructure
  • API Gateway
  • Enterprise Service Bus
  • Service Delivery

2.

While using Microservices, mention some of the challenges you have faced.


*To answer a Microservice interview question like this, you should list down the blockers you have personally faced while using the technology and how you overcame these challenges. *

Some of the common challenges that developers face while using Microservices are:

  • Microservices are constantly interdependent. As a result, they must communicate with one another.
  • It's a complicated model because it's a distributed system.
  • If you're going to use Microservice architecture, be prepared for some operational overhead.
  • To handle heterogeneously dispersed Microservices, you'll require trained people.

At the end of this Microservice interview question, make sure to talk/ask about how to tackle these roadblocks.

3.

List down the main features of Microservices.


Some of the main features of Microservices include:

  • Decoupling: Services are generally disconnected inside a system. As a result, the application as a whole may be simply built, modified, and scaled.
  • Componentization: Microservices are considered discrete components that can be simply swapped out or improved.
  • Business Capabilities: Microservices are small and focused on a single service.
  • Team autonomy: Each developer works autonomously, resulting in a shorter project timeframe.
  • Continuous Delivery: Enables frequent software releases by automating the development, testing, and approval of software.
  • Responsibility: Microservices aren't focused on projects as much as they are on applications. Rather, they consider apps to be products for which they are responsible.
  • Decentralized Governance: The objective is to select the appropriate tool for the job. Developers have the option of selecting the finest tools to tackle their issues.
  • Agility: Microservices allow for more agile development. It is easy to swiftly add new features and then remove them at any moment.

4.

What do you understand about Cohesion and Coupling?


Coupling

Coupling is the relationship between software modules A and B, as well as how dependent or interdependent one module is on the other. Couplings are divided into three groups. Very connected (highly reliant) modules, weakly coupled modules, and uncoupled modules can all exist. Loose coupling, which is performed through interfaces, is the best type of connection.

Cohesion

Cohesion is a connection between two or more parts/elements of a module that have the same function. In general, a module with strong cohesion may effectively execute a given function without requiring any connection with other modules. The module's functionality is enhanced by its high cohesiveness.

5.

Why are reports and dashboards important in Microservices?


Reports and dashboards are commonly used to monitor a system. Microservices reports and dashboards can assist you in the following ways:

  • Determine which resources are supported by which Microservices.
  • Determine which services are impacted when components are changed or replaced.
  • Make documentation accessible at all times.
  • Examine the component versions that have been deployed.
  • Determine the components' maturity and compliance levels.

6.

Do you think GraphQL is the perfect fit for designing a Microservice architecture?


GraphQL hides the fact that you have a microservice architecture from the customers, therefore, it is a wonderful match for microservices. You want to break everything down into microservices on the backend, but you want all of your data to come from a single API on the frontend. The best approach to achieve both is to use GraphQL. It allows you to break up the backend into Microservices while still offering a single API to all of the apps and allowing data from multiple services to be joined together.

7.

Explain Materialized View pattern.


When we need to design queries that retrieve data from various Microservices, we leverage the Materialized View pattern as a method for aggregating data from numerous microservices. In this method, we create a read-only table with data owned by many Microservices in advance (prepare denormalized data before the real queries). The table is formatted to meet the demands of the client app or API Gateway.

One of the most important points to remember is that a materialized view and the data it includes are disposable since they may be recreated entirely from the underlying data sources.

8.

Are containers similar to a virtual machine? Provide valid points to justify your answer.


No, containers are very different from virtual machines. Here are the reasons why:

  • Containers, unlike virtual machines, do not need to boot the operating system kernel, hence they may be built-in under a second. This characteristic distinguishes container-based virtualization from other virtualization methods.
  • Container-based virtualization provides near-native performance since it adds little or no overhead to the host computer.
  • Unlike previous virtualizations, container-based virtualization does not require any additional software.
  • All containers on a host computer share the host machine's scheduler, reducing the need for additional resources.
  • Container states are tiny in comparison to virtual machine images, making them simple to distribute.
  • Cgroups are used to control resource allocation in containers. Containers in Cgroups are not allowed to utilize more resources than they are allotted.

9.

Which is the most efficient way of implementing service discovery in Microservices architecture?


There are other methods for establishing service discovery, but Netflix's Eureka is the most efficient.

Eureka Server, also known as Netflix Service Discovery Server, is a server that manages all client-service applications. Eureka Server knows all the client apps operating on different ports and IP addresses since every Microservice registers with Eureka Server. It usually makes use of Spring Cloud and isn't very concerned with the application development process.

Using Eureka is a very simple method that doesn't add much to the application's weight. It also works with a variety of online apps. Spring Cloud provides a variety of annotations to make its use as easy as possible and to hide difficult ideas.

10.

How is WebMvcTest annotation used in Spring MVC applications?


When the test purpose is to focus on Spring MVC Components, the WebMvcTest annotation is used for unit testing in Spring MVC Applications.

In the following code:

@WebMvcTest(value =ToTestController.class, secure = false):

We simply want to run the ToTestController here. Until this unit test is completed, no more controllers or mappings will be deployed.

Wrapping up

Finally, the Microservices interview questions listed above will offer you the maximum amount of information and understanding regarding Microservices and its technical aspects. With these Microservices interview questions, you should be able to easily ace your technical Microservices interview or find the most technically competent Microservices professionals. However, you must begin paying attention to soft skills in order to ace your Microservices interview. As a developer, you should brush up on your soft skills because recruiters are searching for a technically sound Microservices developer that also fits in well with their team. Soft-skill questions are important for a recruiter to pay attention to since they want to hire the best candidate for the job. As a result, soft skills are just as vital as technical ones.

If you have both soft skills and technical prowess, head over to Turing.com and apply for a position as a Microservices developer. Join forces with Turing to construct your ideal team by hiring from the top 1% of developers on the planet.

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