Journal

Notes on architecture, backend engineering and the English journey.

All Architecture Backend DevOps System Design Career Learning

Featured

Learning B1

Why I'm Learning English as a Developer

I’m a senior backend developer learning English while going deeper into AI. In this post, I share my current English level, my challenges, my goals, and how I plan to measure my progress.

Aug 27, 2026 3 min read

Backend A2

Scout: My AI Tool That Watches Your App and Explains the Errors

Scout checks your app's metrics every 20 minutes. When something goes wrong, it finds the broken part of the code and asks an AI model to explain the problem — and how to fix it.

Sep 9, 2026 5 min read

System Design A2

Use an Idempotency-Key for HTTP Requests

When you build an API, one important question is: **What happens if the same request is sent twice?** Sometimes, nothing bad happens. But sometimes, sending the same request twice can create duplicate data or perform the same operation twice.

Aug 29, 2026 5 min read