An ERP and its companion app, built end to end

Hassan Enterprise ran on paper and spreadsheets. I architected a single integrated platform — NestJS services, a Next.js admin, and a React Native app for the floor — and migrated the business onto it.

Role
Sole engineer — architecture to launch
Client
Hassan Enterprise
Timeline
July 2025 – July 2026
Stack
Next.js admin, React Native app, NestJS API, PostgreSQL
Deliverables
Admin web, mobile app, REST API
  • 1 platform
    in place of ledgers, spreadsheets and hand-assembled reports
  • 2 clients
    web admin and mobile app on one versioned API
  • 12 months
    architecture, build, migration, handover

The problem

Records lived in ledgers and spreadsheets held by individual staff. Nothing reconciled: stock counts, orders and invoices disagreed, and every report was assembled by hand.

Approach

One NestJS service owns the domain and exposes a versioned REST API with JWT role scopes. The Next.js admin handles setup and reporting; the React Native app handles what happens away from a desk — stock moves, order entry, delivery confirmation — queueing writes when the connection drops.

Architecture

Next.js admin setup, reporting, roles
React Native app stock, orders, delivery
NestJS API — REST + JWT scopes, queued offline writes
PostgreSQL single source of truth, audited writes

Outcome

Workflow digitization across the business: one integrated platform in place of manual record-keeping, with reporting available the same day rather than at month end.

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