HanJunYU

Java Developer and Python Automation Developer

Alibaba • Vollzeit

Sep 2022 - Jun 2026 • 3 yrs 9 mos

Responsible for internal business web platform development and Python‑based automation tooling. Collaborated with cross‑functional teams to deliver feature development, API iteration, automation script deployment and online troubleshooting, participated in code review and release cycles. - Developed full‑stack web modules for internal operation management system using Vue + FastAPI. Implemented permission control, data query and report export functions. Designed RESTful APIs with MySQL and Redis, optimized slow queries and reduced average API response time by 40%, supporting daily usage for hundreds of internal users. - Built multiple Python automation utilities. Leveraged Playwright for web automation and Pandas for business data cleansing & statistics. Realized automatic data synchronization and scheduled report delivery, replacing heavy manual work and cutting weekly manual workload from 120 hours to under 20 hours. - Wrote pytest automated test cases for core web backend interfaces for regression validation. Developed lightweight operation tools for log parsing and anomaly alerting to accelerate issue diagnosis. Added exception handling, logging and retry logic to ensure stable 7×24 scheduled task execution. - Worked with product, QA and DevOps through requirement review, development, integration and production rollout. Investigated online incidents, fixed web compatibility, API failures and automation stability issues. Conducted code reviews and contributed to internal coding standards to improve overall code quality. **Tech Stack**: Python, FastAPI, Vue3, MySQL, Redis, Playwright, Pandas, Pytest, Git, Docker, Linux