I need help finishing the Firebase layer of my website. The front-end is already in place; what’s missing is a solid back-end built around Firestore and a few event-driven Cloud Functions. Here’s what I’m looking for: • Firestore database management – structure the collections and documents so reads and writes remain efficient as traffic scales. • Cloud Functions that react to data triggers, specifically onCreate and onUpdate events, to handle things like automatic field population, basic validation, and lightweight notifications. Everything should sit neatly inside my existing Firebase project, follow best practices for security rules, and be pushed to GitHub so I can track the commits. Once deployed, I’ll test end-to-end; if the functions fire as expected and the data looks clean in Firestore, we’re done.