Swapping the compiler for one that is 10x faster saved 6 seconds on a 15-minute pipeline. Amdahl's Law called it.

The disease is identity, which Java hands to every object and charges you memory for. JEP 401's value objects let you opt out.

Langfuse ships SDKs for Python and JS and nothing for Go. The whole integration turned out to be two files. Plus the eval basics that make it worth doing.

I took 863 MB of text and timed every step. Tokenization ate 99% of the time, and the culprit was a regex.

I solved a team's voice agent problem in one afternoon without writing a single spec - and the spec would have gotten in the way.

I built an agent that won a World Cup betting pool. The trick wasn't giving it more memory - it was teaching it to forget the right things.

Use-after-free, double-free, memory leaks, RAII - the bugs that kill runtimes and the concepts that prevent them.

I spent weeks building BrainJuck. Claude rebuilt it in 3 minutes with a single prompt. Here's the comparison - and what I learned.

Skills aren't magic. They're markdown files a tool reads when the model asks. I went into OpenCode's source to prove it.