Javier Bernal modernized the miw-upm/betca-tpv-core and miw-upm/betca-tpv-angular repositories by upgrading the technology stack, refining CI/CD pipelines, and enhancing deployment reliability. He introduced Docker-based development environments and improved test coverage, focusing on maintainability and reproducibility. Using Java, TypeScript, and Docker, Javier migrated the backend to Spring Boot 3.4.2 and MongoDB 4.12.6, while updating the frontend to Angular 19. He restructured codebases, removed deprecated Heroku integrations, and streamlined deployment with Nginx and Render. These efforts reduced release lead times, improved code quality, and established clearer platform ownership, demonstrating depth in DevOps, backend, and frontend engineering practices.