During April 2025, this developer established a foundational OAuth authentication system across the pucrs-constrsw-2025-1/oauth and pucrs-constrsw-2025-1/base repositories. They architected a TypeScript-based Express.js service, containerized with Docker, to provide secure and scalable user sign-in flows. Their work included setting up service scaffolding, health check endpoints, and environment configurations to ensure deployment readiness and facilitate future authentication features. By aligning OAuth configurations and integrating the authentication service into docker-compose, they reduced integration risk and enabled end-to-end sign-in functionality. The focus on backend development and DevOps practices laid essential groundwork for robust token handling and production deployment.