• Engineered a Last Mile Optimization system with Java, Spring Boot, and PostgreSQL, utilizing MyBatis significantly enhancing order management efficiency by 20%.• Developed REST APIs and leveraged Google APIs for route optimization, processing order data through custom batches, supporting 200+ regions. Architected backend APIs for seamless frontend integration.• Implemented user authentication and data encryption, enhancing application's security and protecting sensitive client information, achieving 100% compliance with data privacy standards.

Designed a RAG application using FastAPI, optimizing the resolution process of daily support tickets.• Developed a data pipeline to handle and integrate various file formats into a VectorDB with embeddings.• Boosted search accuracy using the Cosine similarity and cross-encode re-ranking for document retrieval.• Automated Redmine ticket polling with Kafka, achieving a 75% reduction in the resolution time for user.----------------------------------------------------------------------------------------------------• Developed comprehensive test suites using the JUnit framework, employing advanced techniques like reflection testing to access and validate private fields and methods, increasing test coverage by 30%.• Utilized Mockito for effective mocking and stubbing, including handling static methods and constructors with PowerMock, isolating components to simulate precise behaviours. Applied boundary testing, negative testing, and edge case testing, enhancing software reliability.• Integrated testing frameworks with CI/CD pipelines for automated test execution, using tools like JaCoCo and SonarQube to measure code coverage and identify gaps, leading to an improvement in test quality.