Worked on the element-hq/synapse repository to enhance API robustness and time synchronization capabilities. Addressed a backend issue by refining error handling for 3pid email updates, ensuring that invalid email inputs now return a 400 Bad Request with a clear error message instead of an internal server error. Developed a new utility method in the Module API to provide the current server time in milliseconds, supporting more accurate time alignment across modules. Leveraged Python for backend and API development, with a focus on improving error handling and client feedback. The work delivered targeted, maintainable improvements to the codebase within one month.