During November 2025, Haolin Guan focused on improving build stability for the apache/doris repository by addressing a persistent issue with the Dockerfile’s JDK base image. By updating the Dockerfile to reference the openjdk:17.0.1-jdk-slim image, Haolin ensured that builds no longer failed due to missing or unavailable images, directly enhancing the reliability of CI pipelines and streamlining developer onboarding. This work demonstrated practical skills in containerization, DevOps, and Dockerfile configuration, with clear commit messaging that improved traceability and reproducibility. The targeted fix contributed to a more robust and maintainable build infrastructure, reflecting thoughtful engineering within a short timeframe.