Stefan Maretic enhanced identity and access management capabilities across the cognitedata/cognite-sdk-python and cognitedata/cognite-sdk-js repositories by delivering two cross-language features. He implemented group attributes support in the Python SDK, enabling creation and listing of IAM groups with richer metadata, and updated core layers and tests to ensure reliability. In the JavaScript SDK, he introduced a sessionsAcl type, aligning session-based access control with the broader access management system. Stefan’s work focused on robust API integration, backend development, and data modeling using Python and TypeScript, resulting in standardized, policy-driven governance and improved security for customer integrations across both SDKs.