Deloitte Spring Boot Interview Questions for Experienced (30 MUST Questions + Project Explained)
If you are preparing for a Deloitte Spring Boot interview for experienced candidates, this video is exactly what you need.
In this video, we cover 30 real Spring Boot interview questions that are frequently asked in Deloitte interviews for experienced Java backend developers.
Each question is explained in depth, with real-world enterprise use cases, and demonstrated using a single Spring Boot sample project, so you can visualize how things actually work in production systems.
This is NOT a theory-only video.
This is how Spring Boot is used in real Deloitte-style enterprise projects.
👨💻 Who should watch this video?
Java developers with 2+ years experience
Spring Boot developers preparing for Deloitte interviews
Backend developers preparing for enterprise-level interviews
Anyone targeting Big 4 companies (Deloitte, EY, PwC, KPMG)
📌 30 Deloitte Spring Boot Interview Questions Covered
What is Spring Boot and why do enterprises like Deloitte use it?
What does @SpringBootApplication actually do internally?
How does Spring Boot auto-configuration work?
What are Spring Boot Starter dependencies?
What is Dependency Injection and how does Spring Boot implement it?
Why is constructor injection preferred over field injection?
What is @RestController and how is it different from @Controller?
How does Spring Boot convert Java objects to JSON?
What is Spring Data JPA and why is it powerful?
What is @Entity and how does ORM mapping work?
What is @Transactional and why is it critical?
Lazy vs Eager fetching — when should you use which?
What is Pagination and why is it important?
What is @ControllerAdvice and how is it used?
How does Spring Boot handle CORS?
What is Spring Security and why is it needed?
How does HTTP Basic Authentication work?
What is JWT and why is it preferred in enterprise applications?
What is Spring Boot Actuator and why is it important?
How does Spring Boot support externalized configuration?
What are Spring Profiles and when should you use them?
Difference between @Component, @Service, and @Repository
How does Spring Boot handle REST API validation?
How does Spring Boot embed servers like Tomcat?
How does Spring Boot support microservices readiness?
How does Spring Boot support testing?
What is the role of application.yml in Spring Boot?
How does exception handling work in Spring Boot?
How does Spring Boot manage database transactions?
Why is Spring Boot preferred for enterprise development?
🧩 Project Used in This Video
All explanations are demonstrated using a single Spring Boot sample project, covering:
REST APIs
JPA & Hibernate
Transactions
Pagination
Validation
Security
Profiles
Configuration management
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