During their work on the derailed/cilium repository, this developer refactored the Hubble peer service to adopt a cell-based architecture, introducing a new peercell package and integrating it with the existing Hubble cell structure. Using Go and applying principles of modular architecture and system design, they focused on reducing cross-component coupling and addressing technical debt. Their approach improved code maintainability and organization, laying a foundation for safer and faster future feature development. Although no bugs were fixed during this period, the depth of the architectural changes provided long-term benefits, making the codebase more accessible for maintainers and easier to test.