Tell me about your experience at your last job. What was your contribution?

At my last job, I was involved in developing backend services in Java for processing large volumes of data. My contributions included:

• Optimizing the performance of key modules, which reduced query processing time by 30%.
• Implementing modular testing using JUnit and Mockito, which improved code quality and simplified maintenance.
• Participating in the design of microservices architecture, including integration via REST API and using Spring Boot.
• Setting up CI/CD processes for automating build and deployment of applications.

I also actively participated in code reviews and mentoring junior developers, which contributed to improved team collaboration and knowledge sharing.