Marcelino Alberdi focused on enhancing type safety and documentation for the erlang/otp repository’s HTTP client during September 2025. He refactored parameter handling by updating uri_string:uri_string() types to string(), ensuring the code accurately reflected actual data usage and reducing the risk of binary value errors at runtime. Marcelino also revised the API documentation, particularly the ContentType description in httpc:request/4, to align with the updated type expectations and real-world usage. Working exclusively in Erlang and applying backend development expertise, he improved maintainability and onboarding by ensuring the documentation and codebase remained consistent and clear for future contributors.