Wiktor Gut contributed to the Expensify/App repository by preparing the codebase for an upcoming Onyx migration, focusing on deprecating the use of Onyx.connect in favor of the newer useOnyx approach. He refactored the handling of allPolicyTags, relocating it to a temporary location and clearly marking it for future removal as part of the broader transition. This work, implemented using TypeScript and front end development skills, established a foundation for cleaner Onyx integration and improved policy tag management. By following reviewer guidance and aligning with architectural goals, Wiktor ensured the migration path was well signaled and maintainable.