During September 2025, Pierre Tsier contributed to the Metta-AI/mettagrid repository by restoring S3 support for file handling utilities and addressing a resource cleanup issue in MettaGridEnv. He implemented Python-based solutions to enable seamless read and write access to AWS S3 buckets, expanding the platform’s cloud storage capabilities. Additionally, Pierre resolved a bug by introducing a close method that ensures the stats writer is properly closed and buffered statistics are flushed on environment termination, improving data integrity and resource management. His work demonstrated a solid grasp of environment management, file handling, and cloud integration within a focused development cycle.