In May 2025, Etzel focused on enhancing the reliability of endpoint construction in the supabase/supabase-js repository by addressing a nuanced bug in SupabaseClient’s URL normalization. He replaced the stripTrailingSlash function with ensureTrailingSlash, ensuring that sub-paths in custom base URLs are preserved when building service endpoints. This adjustment reduced errors for customers using non-root URLs and improved the developer experience by standardizing base URL handling. Etzel applied his expertise in JavaScript, TypeScript, and API integration, demonstrating careful attention to edge cases and robust testing practices. The work delivered tangible business value by minimizing endpoint misconfiguration risks.