Cron-driven agents that plan, write, test and open pull requests without me. Including the test gate that never actually ran.

I shipped an admin dashboard to production with no authentication and found it thirteen minutes later. Including the part I got wrong about CSRF.

Spawning an AI agent from a Celery worker inside Docker. Node in a Python image, timeouts that don't fire, and a serialisation bug.

A shebang with arguments works on macOS and fails on Linux. The error says the file doesn't exist. The file exists. Here's what's actually happening and the one flag that fixes it.

Running my own GPU inference on rented hardware instead of an API. Cold starts, cost per hour, and whether it was worth it.

Building JuiceFS and GeeseFS on ARM64. GLIBC versions, CGO, arch detection, and why exec format error is never what you think.

I gave an agent a terminal and it took my services down. The command was loginctl, and the real problem was rootless Podman.

Celery workers that read a Sentry error, ask a model for a fix, run the tests and open a pull request. What it gets right and what it invents.

Adding vector search to a Django app with pgvector and an HNSW index, including what it costs in memory and build time.

Renting a GPU to run SDXL, and four hours lost to grainy output that turned out not to be the sampler.

Your container can see the file and still can't read it. chmod and chown look fine. It's SELinux, and the fix is one character.