Contact

I read everything. I answer corrections and technical questions first, usually within a few days.

Corrections

If a number, log excerpt, or claim on this site is wrong, tell me. Point at the post and the line. Corrections get made in the post itself with a note about what changed — they do not get quietly edited away.

Consulting

I take a small number of engagements on the kind of work this site documents:

Market data pipelines — broker REST and WebSocket integration, reconnect and resubscribe correctness, freshness monitoring, request-budget planning against rate-limited APIs.
LLM systems over structured data — context assembly that a model cannot silently misread, validation layers, and the failure modes that survive a model upgrade.
Scheduled infrastructure that has gone quiet — silent-failure detection, state-gap alerting, and auditing job schedules that drifted.
Backtest review — look-ahead bias and leakage audits on multi-timeframe strategies. Methodology only.

A useful first email says what is running now, what it does wrong, and what "fixed" would look like. If it is not something I can do well, I will say so rather than take it.

I do not give investment advice, do not build or operate systems that place trades on someone else's behalf, and do not take work whose deliverable is a buy or sell recommendation.