Worked on backend resilience for the basedhardware/omi repository by enhancing the Google Calendar integration using Python. Focused on structured error handling for OAuth token failures, introducing a unified GoogleAPIError that carries HTTP status information across all calendar operations. Implemented exponential backoff retries with adherence to Retry-After headers for transient errors, and improved observability through detailed logging. The approach included explicit handling of token revocation, timeouts, and connection errors, as well as sanitization of logs to comply with repository standards. This work reduced calendar-related errors and improved the reliability and transparency of API integration and backend development processes.