What is the Technical Debt Risk of Using Firebase for a Scaling B2B SaaS?

Firebase (Firestore) is the ultimate cheat-code for hackathons. A solo developer can build an app with real-time sync, auth, and database architecture in one afternoon. However, utilizing Firebase for a complex B2B SaaS platform is a dangerous architectural mistake.

The NoSQL Query Trap

Firestore is a NoSQL document database. As your startup scales, you will inevitably need to generate complex reports (e.g., "Show me all users in Paris who purchased Product X but refunded Product Y"). Because Firebase lacks relational table "JOINs", your application must download three massive collections and loop through them natively on the client-side.

This process melts the user's mobile data and creates massive "Document Read" charges on AWS/GCP logic. Serious B2B SaaS applications must migrate to relational databases (PostgreSQL/Supabase) to handle enterprise data complexity efficiently.