During November 2025, Chris Robinson focused on backend development for the kart1ka/cal.com repository, addressing a critical OAuth2 token flow issue. He delivered a targeted bug fix in TypeScript, ensuring the refresh-token endpoint now includes the refresh token in its response, which resolved inconsistencies reported by API clients. By aligning the endpoint behavior with OAuth2 standards and client expectations, Chris improved interoperability and reliability. He also addressed failing type checks related to the refresh-token path, enhancing code stability. His work demonstrated depth in API development and OAuth2 protocol handling, with careful attention to minimal, traceable changes that improved system robustness.