Worked on the infiniflow/ragflow repository to enhance the reliability of document parsing by addressing recovery from transient errors. Focused on backend development and error handling using Python, the work involved implementing a targeted bug fix that allowed task progress to be recovered and documents to be re-synced automatically after failures. Adjustments were made to progress tracking and polling logic, ensuring that documents previously marked as failed could resume processing when possible. These changes reduced the number of stuck documents and improved throughput, resulting in more predictable outcomes for downstream consumers and a more robust API-driven document processing workflow overall.