Intro: A to-do list application, combined with calendar system and time tracking feature. Link: https://bullet-journal-d10dc.web.app Repo: https://github.com/g010329/DOIT_React • Built a SPA with React and React router. • Used Firebase Services(Authentication/Database/Hosting) to build and deploy website. • Managed composite indexes in Cloud Firestore to use compound queries. • Built to-do list with perpetual calendar system. Enable user to proceed CRUD operations for task management. • Synchronized tasks update between monthly, weekly and daily log components. • Built a time picker. Enabled user to reschedule tasks to month, week, date with calendar UI. • Built List feature with Google Charts. Enabled user to track working hours of tasks and view time distribution of customized lists. • Optimized user interaction to improve UX. (e.g., User can submit on Enter, close board by clicking outside. ) • Supported RWD on mobile, tablet devices.