Programming

My bot stopped sending questions the day Egypt turned on Daylight Saving Time

I built a Telegram bot that sends math questions to kids every day at 2:30 PM Egypt time. It had been live for two weeks, running every single day wit…

How I hardened my multi-agent AI support copilot

The first post in this series was about the design. This one is about what happened when the first real tickets hit the wiring, and about the hardenin…

Why Safari Said 'Link Not Found' (And Chrome Didn't)

This article was originally published on Jo4 Blog . If you build a URL shortener and your links show "Link Not Found" on Safari, you have approximatel…

Diagnosing Random MariaDB Freezes

How to Debug AI-Generated Code: A Systematic Approach

The Debugging Trap With AI Code You built something cool with Cursor or Bolt. It worked on the demo. Then a user tried it with a slightly different in…

Debugging a Broken Metrics Pipeline: What Actually Went Wrong

Part 4 of a series on building a metrics pipeline into ClickHouse Read Part 3: Understanding Vector Transforms When Things Still Don’t Work At this po…

How Do You Debug What You Can't Reproduce? An IPv6 case study in minimal test environments

The Problem A customer reported that their Discovery scans were failing in a pure IPv6 environment. The error messages pointed to two different issues…

I thought my AI memory hook was broken. It turned out to be Windows, WSL, uv, and one missing login

Part of the series Debugging Claude Agent SDK pipelines . One of the layers I'll mention near the end — hidden account-level Gmail / Calendar MCP inte…

How to Debug Webhooks Like a Pro: Tools, Tips, and Techniques

Webhook security matters because webhook endpoints are public, machine-to-machine entry points into your application. If you trust incoming requests b…

512MiB 512MB — the silent trtexec bug

512MiB ≠ 512MB — the silent trtexec bug This is a short one. But it cost me a full day, so. What I was trying to do Building a TensorRT FP16 engine on…

The Wrong GUID: How a Single Constant Broke WebSocket in Every Browser But Not Python

I run a home automation setup with multiple RTSP IP cameras. The camera dashboard shows a grid of all cameras with a "Stream All" button. Each stream …

JavaScript Error Handling: Moving Beyond Generic Catch-Alls for Efficient Debugging and Resolution

Introduction: The Importance of Understanding JS Error Types JavaScript, with its dynamic and flexible nature, is both a blessing and a curse. While i…

Cron Job Not Running? A Practical Debug Guide for Production

If you are dealing with a cron job that should have run by now but did not, you need a real cron job not running debug process, not guesswork. This is…

Fatal Core Dump (a debugging murder mystery played with GDB)

We Shipped Funnel Tracking and Immediately Found a Bug Hiding in Plain Sight

We shipped funnel tracking to PageBolt last week. Basic stuff — track signup started, email verified, plan selected, trial activated. Within hours, th…