The candidate should have worked as a Pure backend developer in his entire work experience.

MUST-HAVE SKILLS :

Skillset - Required Depth :

- Core Java (Java 8 to 17) & Collections - Ownership

- Multi-threading & Concurrency - Ownership

- Spring Boot & Spring Data JPA - Hands-on

- SQL Fundamentals - Hands-on

- Microservices Architecture - Exposure

- CI/CD, Docker & Kubernetes - Exposure

Definitions :

- Ownership : Should have owned and be responsible for a part of the project where the core skill required is mentioned. He should be able to describe the project and how he delivered on his specific piece. If required he also mentored a few juniors on the deliverables. He should be able to describe what code he wrote, what were the production level challenges faced etc. Can answer scenario questions on this on an expert level with multiple level probing.

- Handson : Was working under supervision of someone else but was responsible for something where the core skill required is mentioned. Should be able to describe the project, his specific role and what were his specific responsibilities. He should be able to describe what code he wrote, what were the production level challenges faced etc. Can answer scenario questions on an average level with 1-2 level probing on specific concepts.

- Exposure : Was working in a team where someone else was responsible for the skill set in question but the person has seen it in action. He knows the issues that happened with respect to the skill and what did the team do. He is not able to solve scenario level questions but knows typically how to collaborate with other team members on solving the problem.

- Knowledge : Knows conceptually about how things work and can answer a few questions. Cannot answer anything in scenario based questions.

Skill/Requirement :

- 1. Pure Backend Developer experience for the entire work duration of 5+ years (No frontend heavy profiles)

- 2. Strong command over Core Java (Java 8/11/17) must have hands-on experience using modern features like Streams/Lambdas in recent projects

- 3. Multi-threading and Concurrency clear experience writing multi-threaded code and handling performance in high-traffic applications

- 4. Spring Boot & Spring Data JPA must have built end-to-end REST APIs from scratch, not just maintained existing ones

- 5. SQL Fundamentals hands-on ability to write complex queries (aggregations) and understand database optimization without relying purely on ORM

- 6. Microservices Architecture past exposure required, assessment by asking questions like : Have you worked on breaking down a monolith or service discovery (Eureka)