Alfonso developed a production-ready Node.js MCP server for the punkpeye/awesome-mcp-servers repository, architecting secure sandboxed JavaScript execution using Docker-based isolates to enable safe, scalable LLM-driven automation. He focused on backend and full stack development, implementing isolated runtimes for executing untrusted code while maintaining performance and security. In the ogcio/logto repository, Alfonso enhanced end-to-end testing by seeding user data and addressed data integrity by removing duplicate organization entries in the Public Service V2 configuration. His work leveraged Go, Node.js, and TypeScript, demonstrating depth in backend engineering, test data management, and the delivery of robust, maintainable server-side solutions.