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Lazy Registrations with Firebase

Overview Simply asking users to sign up isn’t just annoying—it could be costing you 45% of your potential customers, according to the famous $300 Million Button case study. Even worse, this friction is amplified on small screens, where abandonment rates spike to 86% for mobile users who simply refuse to type lengthy forms, according to recent abandonment data. By the end of this article, you’ll have a flow where users can build value first and sign up second, without losing their data. So you can avoid this huge loss of potential customers. ...

January 1, 2026 · Arnošt Havelka
angry guy fixing Firebase emulators

Firestore Emulators Data Not Showing

Firestore Emulator Bug: Data Writes Succeed But Nothing Shows Up (Solved) 🧪 What Happened The Setup Used a single Firebase project for both production and development Ran Firestore locally with the Emulator Suite Used local-only mode to avoid writing to production Everything worked: writes, reads, rules, etc. ⚐️ The Shift Split Firebase into: A production project A separate dev project for local testing Motivation: Emulator Suite doesn’t support everything; separation avoids conflicts with production ...

July 24, 2025 · Arnošt Havelka