Spring Boot Developer Interview Questions to Ask When Hiring

The best Spring Boot developer interview questions test three things at once: core Java, how well a candidate uses Spring Boot’s auto-configuration and starters, and whether they can ship a clean REST API under real constraints. Demand makes this hard to get right. In the 2024 Stack Overflow Developer Survey, 30.3% of developers worked in Java and 12.7% used Spring Boot, and the U.S. Bureau of Labor Statistics projects software developer jobs to grow 15% from 2024 to 2034, about 129,200 openings a year. This guide gives you 30 questions grouped by concept, code, and experience, what a strong answer looks like, and a way to score candidates on evidence before they ever reach a live interview.

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Why use skills assessments for Spring Boot hiring?

Skills assessments show what a candidate can actually build, which a resume cannot. A short, role-specific test scores Java, the Spring Framework, REST APIs, and database work automatically, so a hiring team sees real ability before spending interviewer hours. That matters because skills move fast: the World Economic Forum Future of Jobs 2025 report finds employers expect 39% of workers’ core skills to change by 2030. Credentials age; demonstrated skill does not.

A Spring Boot developer test filters for hands-on ability first, then your interview goes deep on judgment and design. Structure the whole process with the Testlify Competency-to-Evidence Matrix: map each role competency (Java, Spring Boot, REST, data, security) to a specific piece of evidence, whether that is an assessment score, a coding task, or an interview answer. Every candidate is then scored on the same competencies, not on interviewer gut feel.

What are the top general Spring Boot questions to ask?

These 20 questions cover the concepts a mid-level Spring Boot developer should own: configuration, data access, security, testing, and microservices. Ask for the reason behind each answer, not just the definition. Hiring across the stack? Pair this with our Java developer interview questions.

1. What are the key features of Spring Boot?

What a strong answer shows: Auto-configuration, embedded servers like Tomcat, starter dependencies, and production-ready features such as Actuator. The candidate should tie these to faster delivery and less boilerplate.

2. How does Spring Boot differ from the traditional Spring Framework?

What a strong answer shows: Spring Boot builds on Spring with opinionated defaults, auto-configuration, and an embedded server, so there is no external server setup or heavy XML. It speeds up setup without replacing Spring’s core.

3. Explain auto-configuration in Spring Boot.

What a strong answer shows: Boot configures beans based on the classpath. Adding a JPA starter triggers a data source and EntityManager. A senior candidate can name a case where they disabled or overrode an auto-configuration.

4. What does the @SpringBootApplication annotation do?

What a strong answer shows: It combines @Configuration, @EnableAutoConfiguration, and @ComponentScan, so one annotation bootstraps configuration, auto-config, and component scanning.

5. How does Spring Boot manage dependencies with Starters?

What a strong answer shows: Starters like spring-boot-starter-web bundle related dependencies behind one coordinate, so version conflicts drop and setup is faster.

6. How do you configure an app with application.properties or application.yml?

What a strong answer shows: Externalized properties set ports, data sources, and logging. YAML adds hierarchy and profile blocks. Look for use of environment variables and profile-specific files.

7. What is Spring Boot DevTools used for?

What a strong answer shows: Automatic restarts, live reload, and dev-friendly defaults that shorten the feedback loop during development.

8. How do Spring Boot Profiles work?

What a strong answer shows: Profiles define environment-specific config (dev, test, prod) activated by properties or command-line flags, so one build runs cleanly across environments.

9. How does Spring Data JPA simplify database access?

What a strong answer shows: It gives a repository abstraction over JPA with CRUD methods, derived queries, and custom JPQL, so most data access needs no boilerplate DAO code.

10. What is the difference between @RestController and @Controller?

What a strong answer shows: @RestController is @Controller plus @ResponseBody, so it returns data (usually JSON) for REST APIs, while @Controller returns view names for server-rendered pages.

11. How would you secure a Spring Boot application?

What a strong answer shows: Spring Security handles authentication and authorization through a security filter chain, method-level rules, and integrations like JWT or OAuth2. Look for password hashing and least-privilege thinking.

12. How do you handle exceptions globally in Spring Boot?

What a strong answer shows: @ControllerAdvice with @ExceptionHandler centralizes error handling and returns consistent, structured error responses instead of leaking stack traces.

13. What are the types of dependency injection in Spring, and which do you prefer?

What a strong answer shows: Constructor, setter, and field injection. Strong candidates prefer constructor injection because it makes dependencies explicit, supports immutability, and is easy to test.

14. How do you implement pagination and sorting with Spring Data JPA?

What a strong answer shows: The Pageable and Sort interfaces with methods like findAll(Pageable) return paged, sorted results and keep large queries efficient.

15. What is Spring Boot Actuator and how is it used?

What a strong answer shows: Actuator exposes health, metrics, and info endpoints for monitoring and ops. Look for awareness of securing those endpoints in production.

16. How do you manage transactions with @Transactional?

What a strong answer shows: @Transactional wraps a method in a transaction with configurable propagation and rollback rules. Candidates should know how rollback behaves on checked versus unchecked exceptions.

17. How do you add caching to a Spring Boot application?

What a strong answer shows: @EnableCaching plus @Cacheable and @CacheEvict, backed by a provider like Redis or Caffeine, cut repeat work. Look for cache-invalidation awareness.

18. How do services communicate in a Spring Boot microservices setup?

What a strong answer shows: REST or messaging (Kafka, RabbitMQ), often with a service registry and a resilience pattern like circuit breakers. Look for handling of timeouts and retries.

19. How do you write tests with @SpringBootTest and @WebMvcTest?

What a strong answer shows: @SpringBootTest loads the full context for integration tests; @WebMvcTest slices to the web layer for fast controller tests with MockMvc. Look for a testing pyramid, not only end-to-end tests.

20. How would you create a custom Spring Boot Starter?

What a strong answer shows: Build an autoconfigure module with configuration classes and register it so other projects get a preconfigured setup by adding one dependency. This shows deep understanding of Boot’s mechanics.

What coding questions should you ask?

Talk is cheap; code is evidence. Use these five short tasks live or as a timed take-home. Watch how a candidate structures code, names things, and handles edge cases, not just whether it compiles.

1. Write a REST controller that returns “Hello, World!” at /hello.

@RestController
public class HelloController {
    @GetMapping("/hello")
    public String hello() {
        return "Hello, World!";
    }
}

2. Create a JPA entity class for a Product with id, name, and price.

@Entity
public class Product {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    private String name;
    private double price;
    // getters and setters
}

3. Write a Spring Data JPA repository interface for Product.

public interface ProductRepository extends JpaRepository<Product, Long> {
}

4. Add a service method that finds a product by name.

@Service
public class ProductService {
    private final ProductRepository repository;
    public ProductService(ProductRepository repository) {
        this.repository = repository;
    }
    public Product findByName(String name) {
        return repository.findByName(name);
    }
}

5. Write a query to find all products priced above 100.

@Query("SELECT p FROM Product p WHERE p.price > 100")
List<Product> findExpensiveProducts();

What is the difference between Spring and Spring Boot?

This is the single most common Spring Boot interview question, and a shaky answer usually means shallow experience. A strong candidate frames Spring Boot as a productivity layer on top of Spring, not a rival to it. Use the table to score the answer, or verify it automatically with a Spring Boot test.

How do you gauge a senior developer’s experience?

Concept and coding rounds tell you if someone can do the work. These five open questions tell you how they think under pressure, collaborate, and grow. Listen for specifics: a real project, a real tradeoff, a real number.

• Describe a Spring Boot project where you worked with DevOps or front-end teams. How did you keep integration smooth?
• Tell me about a time you improved the performance of a Spring Boot app. What did you measure, and what changed?
• How do you stay current with Spring Boot? Share a recent feature or practice you adopted and why.
• Walk me through a difficult bug you debugged in production. How did you find the root cause?
• How do you approach testing? Give an example of your unit, integration, and end-to-end strategy.

When should you ask these questions?

Ask them in the technical interview, after a skills assessment and a short recruiter screen. By that point the candidate has already shown baseline ability, so the interview can go deep on reasoning and design instead of re-checking basics.

Open with two or three concept questions to set the level, move to one coding task to see real skill, then finish with experience questions to judge seniority and fit. Keep the whole round to 8 to 12 questions so there is time for follow-ups, which is where the honest signal lives.

Hire Spring Boot developers with evidence, not guesswork

Key takeaways

• Test Java and Spring Boot together. Spring Boot sits on core Java, so a candidate weak in Java will struggle no matter how many annotations they can name. Screen for both, because a gap in fundamentals shows up as fragile production code later.
• Weight the coding task highest. Definitions are easy to memorize and a poor predictor of on-the-job skill. A short, real coding task is the strongest signal you get in an interview, so make it the centerpiece, not an afterthought.
• Assess before you interview. A skills test as the first gate means interviewers only meet candidates who can already do the work. That cuts weeks of screening and raises the quality of every conversation that follows.
• Score on competencies, not vibes. Map each question to a competency with the Testlify Competency-to-Evidence Matrix so every interviewer rates the same things. Consistent scoring is how you compare candidates fairly and defend the decision later.
• Match depth to seniority. Use concept questions for a screen, coding for mid-level proof, and experience questions for senior judgment. A senior developer should show tradeoffs and real numbers, not just correct answers.
• Keep the round focused. Eight to twelve questions with follow-ups beat a forty-question quiz. Follow-ups reveal how a candidate reasons, which is what actually predicts performance on your team.

Frequently asked questions (FAQs)

Yash Patel

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Yash Patel is a Wordpress and SEO Specialist at Testlify with 3+ years of experience in technical SEO, on-page optimization, and content strategy. He works on improving Testlify’s organic presence and produces content focused on hiring, talent assessment, and HR technology.