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Automating Accounts Receivable in a Custom ERP: Reminders, Aging Reports, and Payment Tracking

ERP

June 20259 min read

Automating Accounts Receivable in a Custom ERP: Reminders, Aging Reports, and Payment Tracking

How to build a fully automated AR system with NestJS and PostgreSQL — from invoice generation and scheduled reminder emails to aging reports and overdue escalation workflows.

Building a Workflow Engine for Multi-Step Approvals: NestJS, PostgreSQL, and React

ERP

June 202511 min read

Building a Workflow Engine for Multi-Step Approvals: NestJS, PostgreSQL, and React

A deep dive into building a reusable state-machine workflow engine that powers leave requests, AP vouchers, and AR invoices in a custom ERP — with NestJS backend, JSONB history in PostgreSQL, and a React status UI.

Migrating from Excel to a Custom ERP: Data Mapping, Validation, and Cutover Strategy

ERP

June 202510 min read

Migrating from Excel to a Custom ERP: Data Mapping, Validation, and Cutover Strategy

A practical guide to migrating years of business data from Excel spreadsheets into a custom ERP — covering data mapping, Zod validation, bulk import scripts in NestJS, and a safe cutover strategy for Indonesian SMEs.

Role-Based Access Control in a Custom ERP: NestJS Guards, PostgreSQL Permission Tables, and UU PDP Compliance

ERP

June 20259 min read

Role-Based Access Control in a Custom ERP: NestJS Guards, PostgreSQL Permission Tables, and UU PDP Compliance

How to design and implement a production-grade RBAC system for a custom ERP — covering the PostgreSQL permission schema, NestJS custom guards, Redis-cached permission lookups, and compliance considerations under Indonesia's UU PDP.

Building an ERP Audit Trail and Activity Log: PostgreSQL, NestJS Interceptors, and React Activity Feed

ERP

June 20258 min read

Building an ERP Audit Trail and Activity Log: PostgreSQL, NestJS Interceptors, and React Activity Feed

How to implement a comprehensive audit logging system for a custom ERP — covering PostgreSQL schema design, NestJS interceptor-based logging, JSONB snapshots of before/after state, and a React activity feed component.

Scalable Next.js Project Structure with App Router

Web Dev

June 20259 min read

Scalable Next.js Project Structure with App Router

A battle-tested folder structure for Next.js 15 App Router projects that scales from side project to production SaaS.

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