Worked on the charmbracelet/crush repository to deliver performance and stability improvements for large-scale backend systems. Addressed gitignore matching by replacing regex-based logic with glob-based matching, introducing two-level caching and pre-built matchers in Go, which reduced CPU usage from approximately 80% to 2% during file-walking in large repositories. Enhanced the LSP manager by implementing safeguards against nil clients and adding state checks, improving reliability and error handling. Focused on profiling-driven optimization and maintainability, these changes resulted in faster indexing, lower resource consumption, and more stable editor features, directly benefiting developer experience and scalability for large monorepo environments.