BluuPay v3 is a ground-up engineering blueprint for a multi-tenant SaaS ERP and retail point-of-sale platform, built as a modular monolith inside a Bun workspaces + Turborepo monorepo. The system is scoped across nine functional modules and sixteen industry verticals, with seven separate applications — web, marketing, e-commerce, admin, POS, mobile, and docs — sharing a common core.
The architecture leans on MikroORM's defineEntity pattern for schema definition, TriggerDev v3 for background job orchestration, oRPC for end-to-end type-safe API contracts, and BetterAuth paired with Zitadel for authentication and identity. Real-time data sync between the POS clients and the backend runs through ElectricSQL and TanStack DB, which matters for retail environments where connectivity can't be assumed to be reliable.
The full scope is tracked as a 151-task design-first task registry, sequencing the module and vertical rollout before implementation begins in earnest. Earlier work on the same system focused on the financial core specifically: bank account management and settlement processing in Laravel, using BCMath-safe precision arithmetic to avoid floating-point drift in money calculations, optimistic locking to keep concurrent settlement writes correct, and general-ledger account patterns for auditability.