- Lead backend team. Analyze requirements. Arrange team tasks, review the schedule. Monitor the process. Review code and be responsible of teams' productivity and performances. - Design and extend well-structured, scalable, and efficient RESTful APIs and database. - Implement safe, reliable API service on AWS.

Back-end Java web application development. Lead the development team of 7 members. Redesign the code structure of the project. Introduce integration test and function unit test into development work flow to maintain high standard code output. Provide advice of Agile development (Scrum) that keeps efficient code production.

Back end web application development using Java, PHP and SQL. Meet the high standard of the scrum team that keeps producing efficient, readable, and well-structured code. Keep improving the code quality of the product.

Full stack web application development using Java, Java frameworks, html, JavaScript and SQL. Android app development. Increase the number of users (clients) of Payroll and Leave System to 3 times by improving functions of the system. Manage several systems alone by taking the role of PM, front-end, and back-end.