What role did you play in your previous projects?

In previous projects, my role depended on the scale and stage of development, but I usually performed the following tasks:

• Developing new functional modules in Java, including writing business logic.
• Refactoring and optimizing existing code to improve performance and readability.
• Participating in code reviews, which helped maintain code quality within the team.
• Writing and maintaining unit tests to ensure application stability.
• Collaborating with QA team and other developers to resolve emerging issues.

In some projects, I also participated in architecture design and technology selection, which helped better understand the overall structure of the application.