Mohammed Saalim contributed to both the microsoft/PowerToys and App-vNext/Polly repositories, focusing on feature development and robust testing. He enhanced the Hosts File Editor in PowerToys by introducing a configurable setting to control leading spaces, improving user control over file formatting. For the CmdPal Calculator, he implemented unit tests to validate command behavior based on user settings, ensuring predictable UX. In Polly, he expanded rate-limiting robustness tests, covering typed builders and external limiter management. Working primarily in C# and XAML, Mohammed emphasized maintainability and reliability, delivering features and tests that strengthened cross-repo quality assurance without introducing regressions.