Developed and delivered the Upstream Definitions Management feature for the 0xJacky/nginx-ui repository, enabling dynamic updates and removals of upstream definitions in response to configuration changes. This backend enhancement, implemented in Go, reduced manual maintenance by ensuring proxy targets and upstream references remained accurate and synchronized with evolving configurations. The work included a targeted fix to upstream handling, addressing a specific issue to improve deployment reliability and minimize errors. Emphasizing backend development and testing, the approach aligned with a configuration-driven architecture, supporting more robust and maintainable deployments while streamlining the process of managing proxy targets within the application.