Developed reproducible development environments and enhanced CI/CD pipelines for the 18F/identity-idp and 18F/identity-dashboard repositories, focusing on improving deployment speed, security, and developer onboarding. Leveraged Nix and GitLab CI to implement declarative environment management, integrating security analyzers and expanding tooling to streamline local development. Addressed Makefile reliability issues to reduce friction in linting workflows and introduced dotenv support with improved documentation. For identity-dashboard, established a Nix-based environment supporting Ruby, JavaScript, PostgreSQL, and Redis, with merge request-focused CI rules. This work reduced configuration drift, accelerated secure release cycles, and improved overall code quality and developer experience across both projects.