Gytis focused on improving the developer experience for the input-output-hk/cardano-js-sdk repository by streamlining CORS origin configuration in development and pre-production environments. Using Nix and leveraging configuration management and DevOps skills, Gytis implemented a change that disables origin filtering by setting backend.allowedOrigins to null in dev-preprod. This adjustment eliminated the need for manual CORS configuration, reducing setup time and minimizing friction for developers. The work ensured consistent environment policies and reduced configuration drift, supporting faster onboarding and testing. Gytis also documented the operational and security implications, contributing to clearer governance and more maintainable deployment processes for the team.