Jonathan James Castillo
User Experience Designer | Product Designer | UX Engineer
Today
I'm a product designer and UX engineer with 6+ years across research, flows, and polished UI in Figma — previously leading design for a top-11 U.S. homebuilder, Workday-partner migration tools, and a real-estate platform that scaled to 70K+ users. Lately I work design-through-code with Claude Code, MCP tools, and modern dev workflows so prototype and production feel like one continuous thought, not a handoff.
Case Studies
NorthFigmaDesigning a conversion-focused platform for a quantitative investing brand
Lab
Victory & VengeanceClaude CodeFantasy strategy game prototype blending territory control, tactical battles, and resource-based progression.