Originally published on rohitraj.tech
How I architected RetailOS — an India-first multi-tenant retail platform with billing, inventory, GST invoicing, khata ledger, and offline sync in a 12-module Maven monorepo.
Read the full version with code samples, diagrams, and architecture details: Building a Multi-Tenant Retail SaaS with Spring Boot 3.4 + Java 21 — 12-Module Architecture
More engineering notes: rohitraj.tech/notes
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