Backend and API Development on Supabase, FastAPI and Firebase

The part of your product users never see

A good backend keeps data safe, answers fast and stays stable when real users arrive. We design and build backends and APIs for mobile apps and websites using Supabase, PostgreSQL, FastAPI and Firebase.

The Lettzio marketplace runs its website and Android app from one Supabase backend, and DataLab processes Excel and CSV files on a secured FastAPI service.

What we build

• Database design in PostgreSQL with clear tables, indexes and row level security
• REST APIs in FastAPI for heavier processing, integrations and file handling
• Authentication with email, Google sign in, OAuth and deep links for mobile apps
• File storage with direct uploads using signed URLs on Supabase Storage, Cloudflare R2 or S3
• Background jobs, webhooks and third party integrations

Choosing the right stack

Supabase gives you a managed Postgres database, authentication, storage and real time updates in one place, which suits most apps and platforms. FastAPI is the right tool for custom logic, data processing and Python libraries. Firebase fits apps that rely on push notifications and simple real time data. We often combine them.

Security from the start

Every table has access rules, secrets stay on the server, inputs are validated and uploads are checked. We set up backups and monitoring so problems are caught early.

Who it is for

Startups that need a backend for a new app, businesses replacing spreadsheets with a real database, and teams whose existing backend is slow or hard to change.