Worked on enhancing the registration flow for the Wspolny-Dojazd/frontend-mobile repository, focusing on improving state management and user experience during onboarding. Refactored the registration mutation to leverage onSuccess and onError callbacks, which enabled more precise handling of authentication tokens, user redirection, and error messaging. This approach separated success and failure logic, reducing ambiguity and laying the groundwork for future onboarding analytics. Utilized React, React Query, and Context API with both JavaScript and TypeScript to implement these changes. The work addressed robustness in the registration process and established a foundation for more controlled and informative onboarding flows moving forward.