Evan Cottrell
Evan founded Omnihash in Chicago to build production software with clients directly. His work spans AI agents, full-stack products, cloud infrastructure, and the decisions that turn a promising prototype into something a team can actually run.
Writing and work
His engineering notes draw on the work behind Omnihash: where AI agents help, where they fail, how to measure LLM features, and how to keep product quality intact while shipping faster. Omnihash's case studies describe representative client work with identifying details removed.
Selected writing
- AI Pilled: A Case Study — How I built Cold Reach, a procedural sci-fi dungeon crawler, with semi-autonomous AI agents, and why experienced engineers remain essential.
- Agent-driven development: how we actually use AI coding tools — Agent-driven development multiplies what a senior engineer can ship without giving up code quality. How we use Claude Code, Codex, and Cursor in practice, and how to adopt it on a team without creating technical debt.
- Evals for LLM apps: why you cannot ship a reliable AI feature without them — You cannot ship a reliable AI feature on vibes. How to build a small, honest eval set, run offline and online evals, and turn argument into measurement.
- Cutting blockchain RPC costs: lessons from a crypto infrastructure audit — How a crypto infrastructure audit found a bug driving tens of thousands per month in wasted blockchain RPC costs, how that waste hides, and what to check.