Kobayashi Blessing focused on improving build hygiene in the nodejs/docker-node repository by implementing a cleanup step after smoke tests. Using Dockerfile and leveraging containerization and DevOps skills, Kobayashi added logic to remove temporary files from the /tmp directory, ensuring that each build started from a clean environment. This approach addressed issues with residual artifacts that could cause flaky continuous integration runs and complicate debugging. The work, linked to a specific commit for traceability, demonstrated attention to detail in maintaining reliable build pipelines. While the period covered only one bug fix, the solution targeted a core aspect of CI reliability and maintainability.