During September 2025, Yusuf Ozgul focused on backend development and database configuration for the tuist/tuist repository. He addressed a persistent issue where the application failed to correctly configure the database port, leading to unstable connectivity across environments. By updating the runtime logic in Elixir to extract the port directly from the DATABASE_URL—defaulting to 5432 when unspecified—he ensured reliable database connections and reduced environment-specific configuration errors. This targeted bug fix improved deployment reliability and streamlined environment setup. Although the work was limited to a single bug fix, it demonstrated careful attention to runtime configuration and practical use of environment-driven settings.