During October 2025, Eshen worked on backend development and system programming for the cloudflare/workerd repository, focusing on improving the API correctness of container lifecycle operations. Eshen addressed a bug in the Container Stop API by updating the success status code from 200 to 204, aligning the response with standard HTTP semantics and clarifying client expectations. The solution also introduced enhanced error handling for attempts to stop containers that were not running, reducing ambiguity for automation and integration scenarios. This work, implemented in C++, demonstrated careful attention to API contract adherence and reliability, though it was limited in scope to a targeted bug fix.