TaxByNav

Zero-cost architecture — Cloud Run + Cloudflare, tuned for a true $0 ops footprint (cost optimization at the core).

Live production SaaS for tax filing and appointments: zero recurring infra spend while staying secure and scalable.

JWT + refresh, Google SSO, async appointment engine, Gmail SMTP — real clients, ~$0/mo server overhead.

The problem

A tax filing client needed a robust, secure platform with appointment booking under a strict zero recurring monthly infrastructure budget.

I architected a “zero-cost” cloud shape: FastAPI on Google Cloud Run (free-tier scaling) and a Next.js frontend on Cloudflare Pages.

JWT authentication with refresh tokens and Google SSO for a smooth login path.
Custom asynchronous appointment engine (SQLModel + SQLAlchemy): 30-minute slots with automatic cleanup of stale data.
Gmail SMTP for automated admin alerts and client confirmations.

Delivered a real-world business tool that processes actual clients with nearly $0/month in server overhead.