How We Built a Multi-Tenant SaaS for Indian SMBs Using React 19 + Firebase + Razorpay
I'm Narendra, a developer from Rahuri, Ahmednagar,
Maharashtra. Over the past year I built Muttha Finance
— a digital ledger SaaS for Indian shopkeepers,
wholesalers and traders.
This post covers the technical decisions, architecture,
and lessons learned building a production multi-tenant
SaaS from scratch.
Live app: https://app.mutthasales.in
The Problem We Were Solving
Indian wholesale traders run their entire business on
paper registers called "Khatavni" or "Bahi Khata".
Every trader tracks:
- Daily income and expense
- Party-wise accounts (customers + suppliers)
- Post-dated cheques
- Staff activity
Paper fails them constantly — lost registers,
calculation errors, no access control, no backups.
Existing apps like Khatabook solved basic udhaar
(credit tracking) but missed the bigger picture.
We built the complete solution.
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