Built with Replit
Mobile App Backend Stabilization Using Firebase
Marc Brown
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Posted Jan 16, 2026
Fixed auth issues in a Replit-built mobile app by migrating from mock DB to Firebase and refactoring all backend endpoints for stability.
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Jan 13, 2026 - Jan 16, 2026
This project involved stabilizing and production-readying a mobile app originally built on Replit using AI-generated code. The app relied on Replit’s authentication system and a default mock database, which caused authentication and data consistency issues as the project evolved.
I refactored the authentication flow, resolved multiple auth-related errors, and migrated the backend from Replit’s mock database to Firebase. This required updating and re-wiring all API endpoints to ensure secure authentication, reliable data persistence, and compatibility with Firebase’s structure.
The result was a stable, fully working backend that matched the client’s expectations and supported their app reliably going forward. The client was satisfied with the outcome and the improved system behavior.
Skills demonstrated:
Authentication systems, API refactoring, Firebase integration, backend debugging, AI-generated code hardening