During December 2025, Xiebin contributed to the alibaba/ROLL repository by developing a policy-model gated rollout feature that conditionally starts the server based on policy model usage, enhancing control over state offloading during rollout. Using Python and leveraging backend development and data processing skills, Xiebin also addressed configuration consistency by correcting typos in column variable names, which improved both code reliability and documentation clarity. The work demonstrated attention to code hygiene and maintainability, with clear documentation alignment and standardized naming conventions. These targeted improvements supported business value by increasing rollout stability and making future onboarding and maintenance more straightforward for the team.