DevOps

What to Do in the First Ten Minutes of an Incident

The instinct is to start investigating. The first ten minutes are better spent on four other things, and doing them makes the investigation faster.

Debugging

Print Debugging Is Underrated and I Will Defend It

Using a debugger is supposedly the mark of a serious engineer. Print statements are supposedly what beginners do. Both of those claims are wrong.

Next.js

Next.js Dynamic Server Usage: Understanding the Static and Dynamic Boundary

Your build fails because a page tried to read a header. Here is what triggers dynamic rendering and how to decide what each route should be.

AI

Why AI Generated Code Passes Tests and Still Breaks Production

Green CI, clean review, broken production. The gap is that tests check whether code matches the implementation and production checks whether it matches reality.

AI

The Six Bugs AI Coding Agents Write Most Often

After reviewing a lot of agent generated pull requests, the same six failure patterns keep appearing. They share a structure: locally plausible, globally wrong.

AI

Multi Agent Systems Fail in the Handoffs

Each agent works fine alone. Chain them and quality collapses. The failure is almost always at the boundary between them.

JavaScript

Module Not Found in Vite but Fine in Webpack

Same code, same package.json, different bundler, different result. The difference is resolution conditions and how strict each tool is.

PostgreSQL

Why Your Index Is Not Being Used: Reading EXPLAIN ANALYZE Line by Line

You added the index and the query is still slow. Here is how to read a Postgres query plan properly and find the row estimate error causing it.

Python

Debugging asyncio Deadlocks and the Blocking Call Checklist

Your async service handles ten requests a second and pegs one core. Somewhere a synchronous call is blocking the event loop.

Bug Hunt

A 400ms Latency Spike That Turned Out to Be DNS

p99 jumped on one service. The database was fine, every dependency reported healthy, and the flame graph pointed at nothing. That turned out to be the clue.

Bug Hunt

How a Timezone Bug Silently Corrupted Three Months of Analytics

The dashboard looked right. The numbers were wrong by a few percent every day, and the reason was one implicit conversion in a reporting query.

Shopify

Your Shopify Theme Broke After Installing an App: How to Find the Culprit

Add to cart stopped working, the layout shifted, or the page throws a console error. A systematic way to find which app did it and what to do about it.