During March 2025, Hannah Parnell developed a user notification preferences persistence feature for the cssgunc/breast-cancer-hub repository. She implemented local storage using JavaScript and TypeScript to save push and in-app notification settings on the client side, reducing backend writes and improving session persistence. Her approach included frontend validation in React, ensuring users selected at least one notification type before saving preferences. This work enhanced user experience by maintaining settings across sessions and provided clearer data validation. The project demonstrated Hannah’s skills in Expo, state management, and client-side storage, delivering a focused solution to streamline notification preference handling.