During April 2025, Fujianhao worked on the deepseek-ai/DeepEP repository, focusing on improving the reliability of test output in Linux environments. He addressed an issue where empty print statements could cause delays in test result visibility by ensuring these statements are properly flushed, allowing immediate output during continuous integration runs. This targeted debugging effort, implemented in Python, enhanced the stability of CI pipelines and reduced the time required for troubleshooting. Fujianhao’s work demonstrated a strong understanding of Linux I/O behavior and testing practices, delivering a precise, low-risk fix that improved the overall developer experience without introducing new features.