Greg Santos contributed to the onflow/flow repository by delivering features that enhanced developer experience and modernized testing practices. He migrated the testing framework from JavaScript to Cadence, aligning with Flow platform standards and improving test reliability. Greg also integrated Flow AI into the documentation and redesigned the docs homepage using Markdown, focusing on clarity and accessibility for developers. His work included optimizing Cadence NFT serialization as part of broader documentation and developer experience improvements. Throughout the month, Greg emphasized documentation, technical writing, and testing strategy, producing well-scoped, impactful features that addressed platform alignment and developer workflow efficiency without bug fixes.