Yangqian focused on stabilizing DeepSeek integration within the BerriAI/litellm repository, addressing a critical bug in provider configuration. By replacing OpenAIConfig with DeepSeekChatConfig, Yangqian ensured that DeepSeek-specific parameters were correctly mapped and consistently applied across configuration paths. The work involved backend development and API integration using Python, with an emphasis on robust testing practices. Unit tests were added to verify parameter mapping and prevent future regressions, contributing to safer defaults and improved code quality. Although the period did not include new feature development, Yangqian’s targeted fix enhanced the reliability and maintainability of DeepSeek provider support in the codebase.