Worked on the volcengine/verl repository to enhance decode generation stability and configuration reliability under Decode Context Parallel (DCP) conditions. Addressed a critical CUDA programming issue by implementing an automatic downgrade of cudagraph mode from FULL_AND_PIECEWISE to PIECEWISE when DCP is active, effectively preventing illegal memory access during decode generation. Improved backend development by fixing a configuration bug that previously allowed engine_kwargs to be improperly overwritten during engine initialization. All changes were validated on a 4-node, 32-GPU cluster using Python, with updated documentation, expanded unit and end-to-end tests, and successful pre-commit and continuous integration checks ensuring robust error handling.