How One Developer Built a Unified Notification Center Using Firebase RTDB and Firestore

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A developer building a sales team control panel replaced several disconnected systems — leave requests, reminders, group chats, and a shared calendar — with a single unified notification center. The solution uses both Firebase Realtime Database and Firestore, assigning each data type to whichever backend suits it best. Historical records like leave and permission requests are fetched from Firestore using single reads, while reactive data such as reminders and chat messages use RTDB real-time listeners. The notification center is rendered as a slide-in panel appended directly to the document body to avoid CSS positioning conflicts caused by nested ancestor elements. The project is built as a framework-free, single-page PWA using vanilla JavaScript, with the goal of keeping Firebase read costs low while providing a personal, browsable activity archive.

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