Etienne contributed to the supabase/dbdev and supabase/pg_graphql repositories, focusing on security and database reliability. In dbdev, Etienne implemented a Content Security Policy and X-Frame-Options headers to mitigate XSS and clickjacking risks, configuring CSP to support both same-origin and select external resources, including dynamic handling for preview environments. Additionally, Etienne improved code maintainability by enforcing Prettier formatting in Next.js configuration files. In pg_graphql, Etienne resolved a schema versioning bug by updating increment_schema_version to use explicit pg_catalog nextval, ensuring reliable schema management. The work demonstrated proficiency in JavaScript, SQL, and configuration management, addressing targeted security and stability concerns.