Engineering Runbooks

Technical Guides & Architecture Runbooks

Written by senior systems architects at Pakala Software. Concrete implementation guides for complex corporate data, compliance, and infrastructure challenges.

Tax Automation Runbook #01 • 8 min read

Engineering a High-Performance GSTR-2B vs. Purchase Reconciliation Engine

A deep architectural analysis of Section 16(2)(aa) matching algorithms. How to parse multi-gigabyte GSTR-2B JSON payloads, normalize inconsistent invoice numbering formats (e.g. INV/24-25/001 vs INV-24-25-1), and execute multi-pass deterministic matching in PostgreSQL without memory leaks.

PostgreSQL JSONB Deterministic Math Section 16(2)(aa)

Cloud Infrastructure Runbook #02 • 6 min read

Zero-Downtime MX Migration: From Legacy cPanel Webmail to Google Workspace

The complete 7-step checklist for enterprise email cutovers: lowering TTL thresholds 48 hours prior, pre-syncing 500GB+ of historical IMAP mailboxes, setting up dual-delivery routing, cutover of MX records, and implementing 2048-bit DKIM and strict DMARC rejection policies.

Google Workspace DNS TTL DKIM / DMARC

Disaster Recovery Runbook #03 • 5 min read

Point-in-Time PostgreSQL Recovery (PITR) with AWS S3 Object Lock

Implementing immutable, ransomware-proof backup architectures for mission-critical business ledgers. How to configure Write-Ahead Logging (WAL) streaming to S3, enforce compliance-mode retention, and simulate quarterly recovery drills.

AWS S3 WORM PostgreSQL WAL Ransomware Defense