Engineering Cheatsheets

Production-Grade Reference Guides

Technical cheatsheets for senior software engineers and architects. Focused on real-world implementation patterns, not theory.

Featured Guides

Payment Integration (KSA)

Complete integration guides for Saudi payment systems: HyperPay gateway and SADAD EBPP. Includes Java/Spring Boot examples, security patterns, and production checklists.

Database Migrations

Flyway production patterns: zero-downtime deployments, backward-compatible migrations, CI/CD integration, and troubleshooting failed deployments.

Spring Batch

Chunk processing, partitioning, error handling, and scaling patterns for high-volume batch jobs. Includes Java config examples and performance tuning.

Apache Kafka

Architecture deep-dive: ISR mechanics, KRaft vs Zookeeper, delivery semantics, security layers, and production monitoring.

Why These Guides Exist

These are the reference documents I wish I had when implementing these systems in production. Each guide covers:

Architecture fundamentals — Understand the why, not just the how
Production patterns — What works at scale, what breaks
Security considerations — PCI-DSS, TLS, authentication, authorization
Troubleshooting — Common failure modes and recovery strategies
Code examples — Copy-paste ready Java/Spring Boot implementations

About

I’m a senior software engineer focused on payment systems, data engineering, and distributed systems in the GCC region. These guides consolidate lessons learned from production implementations.

Website: furqanshaikh.com
GitHub: @furqanshaikh
LinkedIn: Furqan Shaikh

Contributing

Found an error or outdated information? These guides live on GitHub:

All content is versioned and timestamped. Last updated dates appear on each guide.

Quick Links

Kafka Guide

751 lines of Kafka architecture

Flyway Guide

Zero-downtime migrations

Spring Batch

Batch processing patterns

HyperPay

Payment gateway integration

SADAD

Saudi EBPP integration