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Modeling Kasbon: Employee Cash Advance in an ERP

ERP

July 20269 min read

Modeling Kasbon: Employee Cash Advance in an ERP

How I built the kasbon flow end to end in a real carwash ERP — request, cash-session disbursement, piutang tracking, and automatic payroll deduction.

One Contract, Two Backends: Offline Parity for Web and Mobile

Software Development

July 20269 min read

One Contract, Two Backends: Offline Parity for Web and Mobile

How a single typed repository contract with Api and Mock adapters gave our Next.js POS and Flutter carwash app full offline and demo parity.

Designing POS Cash-Session Reconciliation in an ERP

ERP

July 20269 min read

Designing POS Cash-Session Reconciliation in an ERP

How I designed opening float, cash-in/out, expected-vs-counted variance, and an append-only audit trail for a real Indonesian carwash POS.

Idempotency Keys That Stop a POS From Double-Charging

Backend

July 20269 min read

Idempotency Keys That Stop a POS From Double-Charging

How I made carwash POS payment settlement safe against double-taps and network retries using idempotency keys, a Postgres unique constraint, and one guard spec test.

Inventory Truth: A Stock Movement Ledger, Not a Column

Backend

July 20269 min read

Inventory Truth: A Stock Movement Ledger, Not a Column

Why I made SUM of an append-only StockMovement ledger the source of truth in my carwash ERP, and treated Product.stockQty as a cache I rebuild.

Testing NestJS Applications: Unit, Integration, E2E Guide

Backend

July 202611 min read

Testing NestJS Applications: Unit, Integration, E2E Guide

A practical walkthrough of testing NestJS apps at three layers — mocked-provider unit tests, real-database integration tests, and supertest-driven end-to-end tests.

Showing 109–114 of 428 posts

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