Worked on the facebook/pyrefly repository to address stability and privacy concerns by reverting recent opt-in telemetry changes in the ad_hoc_solve component. Focused on backend development using Rust, the work involved removing telemetry event logging and associated code paths, thereby restoring the system’s previous behavior and reducing maintenance overhead. The approach emphasized clear traceability, with explicit references to the original changeset and differential revision to support future audits and reviews. By prioritizing user privacy and system reliability, the developer ensured that no new regressions were introduced, maintaining a clean and auditable commit history throughout the process.