John R. Kosinski — Blockchain & Web3 freelancer in Chiang Mai

John is a senior technologist and system owner specializing in high‑risk, high‑constraint environments across blockchain, financial markets, and large‑scale distributed systems. He is known for owning systems end‑to‑end where failure carries real financial, operational, or reputational consequences. John brings ideas from concept to production under risk, constraint‑driven architecture, and decision ownership in ambiguous environments.