Worked on the BerriAI/litellm repository to enhance backend stability and maintain compatibility with OpenRouter workflows. Focused on debugging and error handling, the main contribution involved reverting the GPT-5.2-Codex mode from 'responses' back to 'chat' after identifying that the previous change caused crashes with OpenRouter integrations. This fix restored reliability for production deployments, reducing downtime and support requests. The work demonstrated skills in API integration, backend development, and version-controlled reversions, with careful attention to commit traceability for future audits. Utilized JSON for configuration and data handling, ensuring that the system remained predictable and functional for end users.