Worked across vitest-dev/vitest, scalar/scalar, and NangoHQ/nango to enhance reliability and integration with external APIs. Introduced seed-aware test sequence logging in vitest, enabling more effective debugging by improving traceability when tests are shuffled. Addressed a bug in scalar by updating form-urlencoded request handling, converting object values to URLSearchParams to prevent server validation errors. In Nango, extended QuickBooks realmId validation to support a wider range of legitimate IDs. Leveraged TypeScript, JavaScript, and YAML throughout these projects, focusing on backend development, API integration, and robust testing practices. Collaborated with multiple teams, contributing both features and targeted bug fixes.