Rohan Charles developed a user-controlled mid-stream fallback feature for the BerriAI/litellm repository, enabling users to disable automatic fallbacks during streaming based on their preferences. He implemented backend logic in Python to propagate and raise original exceptions when fallbacks are disabled, thereby increasing error transparency and giving users more control over error handling. His approach focused on robust stream processing and thorough testing to ensure reliability. By surfacing original exceptions to clients, Rohan improved debuggability and user trust in the system. The work demonstrated depth in backend development and careful attention to error handling within a production streaming environment.