Charlie contributed to the instructlab/instructlab and meta-llama/llama-stack repositories, focusing on reliability and maintainability. He refactored system profile auto-detection in instructlab to use a Metadata class within configuration files, replacing error-prone filename matching and prompting users to update existing profiles. In meta-llama/llama-stack, Charlie improved error handling by ensuring client initialization exits gracefully on failure, and fixed API argument handling in llama-stack-client-python to prevent runtime errors during model retrieval. His work, primarily in Python and Markdown, emphasized robust scripting, API integration, and clear documentation, resulting in more reliable automation and reduced support overhead for downstream users.