8+ years experience with Java, I''ve code with java since my university day. 4+ years experience in developing back end services with springboot, hibernate/jpa,aspose, quartz cron, activiti workflow, RabbitMQ messaging, spring asynchronous, redis cache, keycloak, jwt, aws, s3. I've done multiple modules from the most simple one to many complex ones. I got my hands on developing mobile apps for android, developing simple 2d video game with unity engine and C#, developing chatbot with spring, heroku and a little bit of postgresql. I had my hands on a bit aws cloud service also.Work ExperienceJava Backend Software Developer 2019 - Present- Contributed to backend development for a Singaporean government website, focusing on modules supporting microservices architecture. - Developed and maintained well-documented technical specifications for modules, ensuring clear communication across teams.- Handled bug fixes and patches as part of the maintenance team, ensuring continuous system reliability and performance.- Worked in the development team, building new features and modules from the ground up and addressing change request (CR) by adding features to existing modules based on user feedback. - Improving performance of high traffic service using asynchronous methodology and cache implementation.- Collaborated closely with the frontend team to integrate new APIs and features, ensuring seamless functionality.-Employed Scrum methodology throughout the development process to enhance team coordination and efficiency.- Assisted Quality Assurance in testing features during development to accelerate progress and meet project deadlines.- Mentoring junior team member and gave guidance on tackling issue(s) and solving problem(s).- Improved data migration process by building microservice module to automatically migrate data from xml file with pre defined mapping rule.- Managed Database storage by performing data archival activity to archive data older than 5 years old with AWS Glue