Ethan Park

Lead Prompt Engineer

Ethan Park is Lead Prompt Engineer at Promptsy, where he architects, tests, and maintains the prompt systems that power the platform's AI features. With 8+ years at the intersection of NLP, UX design, and software engineering, Ethan pioneered production-grade prompt engineering practices before the discipline had a name. He treats prompts like production code: versioned, reviewed, tested against evaluation sets, and monitored in production. Ethan specializes in translating brand voice and product intent into reliable model behavior, with deep expertise in edge case handling and failure mode analysis. He writes about prompt engineering methodology, LLM evaluation, and building AI features that work consistently at scale.