Spring Boot Microservices Interview Questions to Prepare in 2021

Spring Boot Microservices Interview Questions

Because Microservices technology is becoming the new norm in cloud development, you might be interested in making it your life-long career. However, before doing that, you must know how to make it successful for the Spring Boot Microservices Interview Questions here. This blog prepares you for that.

Microservices technology has been in use for some time with a wide array of benefits to the users. This technology can be defined as a platform that provides for the external connection of data. Knowing the basics about Microservices and the related skills prepares you for its interviews. This article shares commonly asked Spring Boot Microservices questions and their answers. 

Spring Boot Microservices Interview Questions

  • What is Spring Cloud?

Most, if not all, Microservices interviews will feature this question. In most instances, the question will come at the top of the interview questions posted to you. Therefore, knowing how to respond to this question is critical since it might be imperative to your success in the interview. The right answer would be something like, ‘Spring Cloud is integrative software that provides access to external data.’ 

Spring Cloud software is super-fast in nature and ensures that the application-making processes happen fast and accurately. The data flow within the software is voluminous, but the software’s speed provides for this need. Here are some of the features Spring Cloud provides for;

  • Circuit Breaking
  • Message Distribution Across the Globe
  • Data Routing
  • Invention Services and Registering Them, and many more
  • What’s your understanding of Spring Boot?

The interviewing panel will likely want to know what you know about Spring Boot before you can venture into Microservices architecture as a career. As you answer this question, remember that Spring has become more sophisticated over the years. While many features are being added to the advantage of the users, the technology only gets more complex. As with most technologies, Spring Boot requires you to work with new projects, making it worthwhile.

In working with such a new project, you will need to do several things. You may need to feature additional paths, including Maven dependencies. In addition, you may likely have to configure Spring software, and the process might have many errors. That’s when Spring Boot comes in to curtail the configuration errors, making it an important element of project development. Wrap this up and answer the question.

  • What is Ubiquitous Language (UL)?

This is a question you will likely come across either as a freshman or an expert with years of experience in Microservices architecture. Therefore, knowing how t respond to this question will add value to the entire interviewing process. Every field, including law, medicine, nursing, or artificial intelligence, has a particular language code with which they communicate as members. That is what constitutes the Ubiquitous language in Microservices. Your answer to his question would be something like, ‘Ubiquitous Language refers to the language mode particular users and a developing team of a given domain uses for communication.’ 

Since the sole purpose of developing a ubiquitous language is to ease communication among the team members, the language must be understood by the entire team. This overruns the possibility of any discrepancies while working on Microservices and makes information processing an easy process. The UL would also allow various experts within a particular niche to bring heads together and troubleshoot domain-related issues.

  • What is the essence of Domain-Driven Design?

Following its inception about a decade ago, Microservices architecture has created various features, including the Domain-Driven Design, DDD. The operational processes of Microservices are all intertwined with DDD in a way or another. The following necessitated DDD;

Ubiquitous LanguageThe need for an all-encompassing language for all team members, users, and developers.
Countered ComplexityThe architecture was getting more complex, which necessitated a system that could contain and manage the complexity.
MaintainabilityThe need to sustain and maintain the software and its components.
Domain MappingThe need for a mapping system to the domain
Design Knowledge BaseThe DDD would provide a knowledge base for reference in designing.
  • What characterizes Microservices?

Your potential employer might want to know whether you are familiar with the Microservices architecture characteristics. Besides being of help during the interview session, knowing the properties of Microservices architecture will definitely add up to your personal consumption and knowledge base buildup. Your answer to the question could include several of the properties listed below;

  • Provision for failure; Microservices architecture performs troubleshooting functionalities. Therefore, design for failure is one of its key properties.
  • The top-down structure uses the top-down approach to determine the overall goal and splits the required services into various subsections, ultimately leading to the overall goal’s realization. 
  • Infrastructures are easily automated; this takes care of the complexity of the modern-day Microservices architecture.
  • Decentralized management; the system operates by delegating tasks and not leaving the workload for a single component of the entire entity.
  • Independence; although Microservices features various components, each tends to be independent and readily deployable on its own.
  • Responsibility among teams; once a task has been assigned to a particular team in the system, it takes the overall responsibility for the assigned task.
  • What are the advantages and disadvantages of Microservices architecture?

Every move in this technological advent has pros and cons. What determines the viability of a move is the balance between these two faces of a coin, the head (pros) and the tail (cons). The table below highlights the key advantages and disadvantages of Microservices. 

A wide variety of technologies to choose fromThis leads to the entire system being more complex
A Microservices can only handle a single task at agoThis leads to extended working periods and delays in delivery
The units within the system can be dispatched at individual levelsNecessitates the need for more configuration, increasing the operational and running costs
Allows for simultaneous creation and dispatching of servicesReconciling and joining the resultant services is cumbersome
The teams regularly work to release new software and appsTracking the apps and software becomes challenging and less safe
Microservices provides for service safety and securityThe multiple domains and boundaries the system works with places a challenge in the security and safety track
  • What are the tests in Microservices?

Microservices architecture features three classes of tests. The interviewer(s) definitely would like to know if you understand the tests undertaken within the Microservices operations. You could be aware of these tests, have them at your fingertips, and easily mention them. However, explaining the different tests to the interviewing panel goes a long way to place you ahead and earn you an extra point in the interview. Here are the three tests in Microservices;

  • Bottom Level Test – These are processes that follow automatic procedures and default settings. Because they are automated, these tests are more general and include unit tests to determine functionality status.
  • Middle-Level Test – These are the second-degree tests which are more expounded. For instance, a company can perform a middle-level test to analyze stress levels and their effects.
  • Top-Level Test – These tests happen at the highest degree and are fewer than the preceding two. They would include the tests by the team to help the stakeholders know, understand, and accept the team’s provisions.
  • What recommended actions and best practices guide Microservices creation?

Microservices architecture is dynamic, and during this technological advent, the architecture will always feature new developments. Such advances need to be guided by some codes and best practices to help the developer create a competitive product that will stand a chance in the market. Your answer to this question should include the following tenets; 

  1. Treat each microservice independently and dispatch data separately from a microservice and another.
  2. Determine the maturity milestones and track the codes for these milestones.
  3. When it comes to building and constructing each microservice, treat it as an independently deployable organ and do a separate buildup.
  4. Use carriages and containers to deploy the microservices and their components.
  5. The system will have many servers at different phases and view and handle these independently. 
  • What do you understand by the term RESTful?

It’s beyond doubt that any Spring Boot Microservices interview will pose that question to you. Therefore, you must know how to respond to this question satisfactorily. RESTful is short for representational Service Transfer. It is a subsidiary service that allows communication of microservices, their components, and the involved computer systems via the internet. Without RESTful, the entire process of developing Microservices, troubleshooting them, and even implementing them would be cumbersome.

  •  On what devices can a person use Microservices?

This question seeks to understand which devices and electronic appliances have Microservices architecture suitability. Be sure to include smart TVs, wearables, smartphones, mobile devices, websites, desktop computers, and laptops.

  1. List some of the big companies that have incorporated Microservices architecture?

The interviewer, at this point, wants to know whether you know the companies that are already utilizing Microservices. Such companies include eBay, Netflix, Uber, Karma, Amazon, and Lending Club.


Microservices architecture is fast-developing and featuring new technologies. That being the case, anyone looking forward to joining this architecture as a long-term career must acquaint himself with the skills required within architecture. In addition, a person must know the common interview questions and the corresponding answers as doing so may open the doors to this lifelong career. This article has featured eleven such questions and their answers.

Other Questions Relate to the Topic

Here are additional questions you might want to address;

  1. Is Microservices architecture an interesting field? Absolutely. Working with various teams and experts characterizes Microservices architecture. Nothing can be more interesting than this.

  2. What is the future of Microservices architecture? With the many technological advancements in place, Microservices architecture features, the future looks bright. More developments, paths, and configurations are to set in. 
Spring Boot Microservices Interview Questions to Prepare in 2021

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