During March 2026, Lqsxianren focused on backend development and testing for the BerriAI/litellm repository, addressing a bug that caused thinking blocks to be dropped from responses when the thinking field was null or missing. Using Python, they implemented a block-type-based preservation approach, ensuring that thinking blocks are reliably retained regardless of field presence. Their work included adding regression tests to validate behavior across edge cases, enhancing both reliability and user experience. By aligning commit references to the fix, Lqsxianren improved traceability and maintainability. This targeted engineering effort demonstrated depth in API integration and robust backend problem-solving.