I'm Marcus — a UX engineer who designs and ships production interfaces. I work at the seam between Figma and the codebase, where most products quietly fall apart. Seven years, forty-two shipped surfaces, zero redesigns needed after launch.
Four projects where the interface was the product. Each one shipped, measured, and still in production.
Built and shipped a 140-component design system for a Series B analytics company. Replaced six fragmented UIs with one typed, themeable foundation. Cut build time for new features by 60%.
Designed and implemented a command palette that replaced five navigation menus for a 200-person editorial team. Reduced average task completion from 14 clicks to 3 keystrokes. Adopted org-wide in six weeks.
Shipped a streaming dashboard framework that renders 10k+ data points at 60fps without virtualization tricks. The interaction model — scrub-to-inspect — became the team's default debugging surface.
Designed and built a long-form reading app with a custom layout engine for measure-controlled typography. 4.8 stars across 12k reviews. Featured by Apple for "exceptional attention to type detail."
No handoff theater. I design in the medium I ship in, and every artifact is production-grade.
Essays on interaction engineering, design systems, and the craft of shipping interfaces that last.
I take on one or two projects per quarter — usually design systems, complex interaction surfaces, or products that have outgrown their first UI. If that sounds like your problem, send me a note.
marcus@chenux.dev →Response time: usually within 48 hours. For longer briefs, a one-page summary of the problem and timeline is enough to start.