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Accounts Payable Multi-Level Approval Workflow in NestJS

ERP

June 202510 min read

Accounts Payable Multi-Level Approval Workflow in NestJS

How I built a configurable, amount-based multi-level AP approval system with NestJS and PostgreSQL—from schema design to the approval chain algorithm.

ERP Invoice PDF Generation: Puppeteer + Handlebars in NestJS

ERP

June 20259 min read

ERP Invoice PDF Generation: Puppeteer + Handlebars in NestJS

A complete walkthrough of building invoice PDF export in a custom ERP system using Puppeteer, Handlebars templates, and NestJS—with Indonesian Rupiah formatting and PPN tax calculation.

ERP Email Automation: Triggering Transactional Emails from Business Events

ERP

June 20258 min read

ERP Email Automation: Triggering Transactional Emails from Business Events

How I built a reliable, queue-backed email automation layer for our custom ERP using NestJS EventEmitter2, BullMQ, and Nodemailer—with Handlebars templates and retry logic.

Why ERP Implementations Fail in Indonesian Businesses — And How to Avoid It

ERP

June 202510 min read

Why ERP Implementations Fail in Indonesian Businesses — And How to Avoid It

An honest look at the most common ERP failure patterns in Indonesian SMEs — poor change management, under-resourcing, and customization creep — with practical advice to prevent them.

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.

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