Luca Mandelli developed foundational OAuth authentication infrastructure across the pucrs-constrsw-2025-1/oauth and pucrs-constrsw-2025-1/base repositories, focusing on secure and scalable user sign-in flows. He established a TypeScript-based Express server with health checks, set up Dockerfile-based containerization, and configured environment scaffolding to support future authentication features. By aligning OAuth configurations and integrating the authentication service into docker-compose, Luca enabled end-to-end sign-in readiness while reducing integration risk. His work emphasized backend development and DevOps practices, leveraging TypeScript, Docker, and YAML to ensure deployment readiness and consistent token handling, laying the groundwork for robust authentication in production environments.