Harsimarpreet Singh

I’m a Full Stack Java Developer focused on building maintainable microservices and shipping reliable features in Agile sprints. I refactored large monolithic modules into independent microservices to improve maintainability and scalability across deployments, and I bring a strong data-structures problem-solving mindset from solving 500+ LeetCode problems.

In my current role, I optimize SQL queries and implement caching strategies that reduced database response times by up to 40% for high-traffic modules. I integrate and consume third-party REST APIs securely using Okta authorization and JWT, strengthen code quality with JUnit and Mockito unit/integration tests, and help teams deliver faster by migrating legacy Ant builds to Maven/Gradle with improved CI/CD compatibility. I also contribute to production readiness by monitoring health and logs with Grafana and Elasticsearch dashboards, containerizing services with Docker for cloud deployment, and designing secure encryption workflows with AWS KMS, AWS Secrets Manager, and AES—enhancing compliance with GDPR, HIPAA, and ISO 27001. I enjoy knowledge transfer too, delivering Spring Boot and modular microservice best-practice sessions within the team.