Fixing Bugs Is Easy. Preventing Their Return Is Hard
Most developers celebrate when they identify the root cause of a bug. The debugger finally reveals the problem. The fix is coded. Tests pass. A pull r…
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The agent that fixes bugs by running the code
I want to tell you about the first time I watched a coding agent fix a bug correctly on the first try. It wasn't the model. The model was the same one…
Hiring Tip: Pair Program on Open Source Bugs
Hiring Tip: Pair Program on Open Source Bugs to Ship Faster We recently watched a junior engineer spend three weeks reading a tutorial series before t…
How I Fixed Canonical URLs Pointing to Localhost in Next.js
Next.js sites using process.env.SITE_URL || 'http://localhost:3000' as a canonical URL fallback will fail Google indexing entirely. The fix: one centr…
Skills Are a Mess. Let's Fix That.
Skills Are a Mess. Let's Fix That. Here's the problem: you write a skill for zeroclaw. It works locally. You push it. Someone else tries to install it…
The RL Flywheel That Actually Works
The RL Flywheel That Actually Works Here's what's breaking: You've got a reinforcement learning setup that trains, validates, deploys, and then... not…
When Soldering Doesn't Fix It: Swap the MCU
A hardware-debugging technique that uses your portable firmware codebase as the diagnostic tool. Plus the deeper bug it exposed once I got past the ha…
A day in the life of `/challenger`: 4 bugs, 4 hypotheses falsified before the fix
The morning I thought it was one single day Saturday May 16, eight ten in the morning. Lukewarm coffee in Françoise's mug — inherited from an office b…
Ghost Bugs Cost $40K: A Neural Debugging Postmortem
When AI silently fails for weeks A production RAG system handling 12,000 queries/day recently ran for three weeks delivering silent errors, resulting …
A Production Python Telegram Bot Was Crashing Every 2 Hours. The Fix Was 18 Lines.
"If you see cascading errors, find the first thing that fails and stop reading the log there. Everything after the first failure is the system reactin…
Trace Points в C++: диагностика production-систем без перезапуска
Одна из самых неприятных особенностей production-проблем заключается в том, что они почти никогда не происходят тогда, когда разработчик готов их иссл…
How I fixed a 0..1 brightness slider in vdu_controls (Philips Evnia DDC/CI bug)
I plugged a new monitor into my Kubuntu laptop last week. The brightness slider in the tray utility I use only had two settings: black, and almost-bla…
Когда онбординг длится 2 месяца: день 3 — проследить главный поток данных
Иногда систему нужно быстро объяснить человеку со стороны: новому разработчику, техлиду, архитектору, аудитору или инвестору на technical due diligenc…
How to fix native module errors when switching JavaScript runtimes
The error that ruins your Monday You spent the weekend migrating your build pipeline to a faster JavaScript runtime. Tests passed locally. CI was gree…
Replay AI coding sessions deterministically: the divergence detector for your repo
There is a moment in every AI coding workflow where you wish you could roll the tape back. The agent did something on Tuesday. By Thursday the model h…
I found 3 silent revenue-leaking bugs in my SaaS in 45 minutes (and the meta-lesson)
I run a small aviation SaaS ($45 MRR, 3 paying customers, 75% churn). This morning I decided to actually look at my data instead of write more code. I…
The git bisect run habit I should have learned ten years sooner
Last Tuesday I lost about three hours to a regression in our checkout service. The cart total was off by a cent on certain promo combinations, and the…
War Story: Debugging a Ktor 2.2 Coroutine Leak in Kotlin 2.0 Microservices
At 3:17 AM on a Tuesday in Q3 2024, our production Kotlin 2.0 microservice fleet hit a 92% memory utilization threshold across 140 nodes, traced to a …