Worked on the prometheus/common repository to refactor YAML interface assertions, focusing on improving test isolation and code modularity. The approach involved moving YAML interface assertions from the main model package into a dedicated test file, which reduced unnecessary YAML dependencies in the core application module. This change, implemented using Go and backend development practices, enabled YAML-agnostic builds for applications that do not require YAML, potentially improving build times for those workloads. By clarifying dependency boundaries and test scope, the work enhanced overall code health and maintainability. The effort demonstrated attention to clean architecture and robust testing within the Go ecosystem.