Senior Product Designer, UI/UX at Mercor

Senior Product Designer, UI/UX | $80-110/hr | Remote (US) | Full-time

About the Role

A leading AI lab is looking for senior product designers and design-minded engineers with exceptional taste to help shape how its AI models design and build for the web and for games. You'll work directly with the lab's researchers to define what "great" looks like in UI and UX, and build high-quality prototypes that prove it. This is a full-time role of 40 hours per week.

This is a W-2 employment position with Cincinnatus LLC, with the opportunity to be placed at a leading AI lab as part of their extended workforce.

What You'll Do

• Partner with AI researchers to identify best-in-class UI and UX patterns, and turn them into clear principles and rubrics that define great design.
• Build polished, interactive web prototypes in code or with AI-native tools such as Cursor, v0, Lovable or Bolt, showcasing strong, diverse design patterns across many product categories.
• Review AI-generated interfaces and prototypes, and give specific, actionable written feedback on layout, hierarchy, interaction, motion and visual polish.
• Explore a wide range of visual styles, frameworks and animation approaches, from focused productivity tools to playful consumer apps and games.
• Collaborate with other designers and researchers to keep standards consistent and keep raising the quality bar.

Who Should Apply

• 7+ years of experience as a product designer, design lead, design engineer or creative front-end engineer at a product- or design-led company (for example Apple, Airbnb, Stripe, Figma, Linear, Spotify or Notion) or a top design agency.
• Hands-on prototyping skills: you build working web prototypes yourself, in code (HTML, CSS, JavaScript, React, Tailwind) or with AI-native tools (Cursor, v0, Lovable, Bolt, Framer).
• A strong grounding in user-centered design, interaction design and rapid prototyping.
• Senior-level design judgment, and the confidence to set direction and explain clearly why a design works.
• Clear written communication and the ability to give precise, constructive design feedback.
• Ability to engage reliably for 40 hours/week during weekdays.

Nice to have: fluency with motion and animation (Framer Motion, GSAP, Rive, Lottie, After Effects) or 3D and WebGL, and game design experience in 2D or 3D. You don't need all of these to apply.

Employment Details

Pay range is $80-110/hr. This is a W-2 position with Cincinnatus LLC, an enterprise staffing company that serves as employer of record, providing payroll, benefits and compliance, while placing employees directly within client teams.

Cincinnatus is an Equal Employment Opportunity employer and does not discriminate based on any legally protected characteristic.