en/

Blog

Writing about backend architecture, fintech systems, and lessons learned building software at scale.

May 1, 20269 min read

Idempotency in Payments: How to Avoid Your API Moving Money Twice

Why idempotency is not a technical detail in fintech, and how to design a system that withstands production reality.

paymentsfintechidempotencybackendpostgresqlapi-design

→

Mar 23, 202611 min read

Claude Code Playbook: The Complete Guide to Using It Every Day

A practical playbook with everything you need to use Claude Code as your development co-pilot: CLAUDE.md, MCP servers, hooks, GitHub Actions, and daily workflows. Updated 2026.

claude-codeaideveloper-toolsproductivitymcpgithub-actions

→