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Tushar Sinha

@tusharsinha

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Java Developer with 4+ years building secure, scalable microservices and REST APIs with Spring Boot.

India

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What I'm looking for

I’m looking for a backend role where I can build secure, scalable microservices and REST APIs using Java and Spring Boot—owning validations, exception handling, and API quality, while collaborating in an agile team with strong engineering practices.

I’m a Java Developer with 4 years of experience building secure and scalable applications using Java, Spring Boot, and Microservices. I focus on designing robust RESTful APIs, integrating third-party services, and delivering clean, maintainable backend code.

At HCL Technologies Limited as a Lead Engineer (Jan 2025 – May 2026), I designed and developed backend applications with Java, Spring Boot, and microservices. I implemented JWT-based security, schema-based multitenancy using Hibernate, and added validations and exception handling to improve reliability and maintainability.

I also built efficient data access layers using JPA/JPQL, worked with MySQL, and integrated AWS S3. I developed inter-service communication using FeignClient, containerized applications with Docker, contributed to Swagger/OpenAPI documentation, and supported logging and monitoring using Kibana.

Previously at Zenon Systems Private Limited as a Junior Java Developer (Feb 2022 – Dec 2024), I assisted with backend development using Java and Spring Boot, contributed to RESTful API development, and wrote unit tests with JUnit. Across projects, I’ve strengthened my engineering discipline through Git/GitHub, CI/code quality practices like SonarQube, and continuous learning of new technologies.

Experience

Work history, roles, and key accomplishments

Lead Engineer

Hcl Technologies Limited

Jan 2025 - May 2026 (1 year 4 months)

Designed and developed backend applications using Java, Spring Boot, and microservices, including JWT-based security and schema-based multitenancy. Built robust RESTful APIs with validations and exception handling, implemented JPA/JPQL data access, and integrated AWS S3, with unit/integration testing and Swagger/OpenAPI documentation.

Java Spring Boot Microservices JWT & Security Hibernate JPA RESTful APIs MySQL AWS S3 Docker Pagination Performance Optimization OpenAPI Junit Mockito Logging Kibana Gitlab Jira

Junior Java Developer

Zenon Systems Private Limited

Feb 2022 - Dec 2024 (2 years 10 months)

Assisted in backend development using Java and Spring Boot, supporting RESTful API development and maintenance. Worked with SQL and JPA for persistence, supported third-party API integrations, performed bug fixing and performance optimization, and wrote unit tests using JUnit.