Charlie contributed to two core projects, focusing on stability and configurability enhancements. In prometheus/node_exporter, Charlie resolved a memory leak in the macOS Filesystem Collector by applying Objective-C memory management techniques, specifically using @autoreleasepool and ensuring proper deallocation of C strings, which reduced memory bloat during statistics collection. For major/traefik, Charlie implemented a strictPrefixMatching configuration for the Kubernetes Ingress provider, aligning path prefix matching with the Kubernetes specification. This feature included comprehensive documentation updates and new test fixtures. Throughout the work, Charlie utilized Go, Objective-C, and Kubernetes, demonstrating depth in system programming and attention to robust, maintainable solutions.