Senior AI UI/UX Product Designer & Prototyper

Cashback24x7; Indiana; On-site; USD 110,000 - 152,000; Full time

Job summary

Mercor, an AI lab, seeks a Senior Product Designer to shape UI and UX for web and games, working directly with researchers to define what great design looks like and building high-quality prototypes in code or with AI tools to prove ideas.

This full-time, 40-hour work week role is based in the United States and positioned through Cincinnatus LLC, offering opportunities to influence cutting-edge interfaces and user experiences.

Qualifications

• 7+ years of experience as a product designer, design lead, design engineer, or creative front-end engineer at a product- or design-led company (e.g., Apple, Airbnb, Stripe, Figma, Linear, Spotify or Notion) or 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.
• Ability to engage reliably for 40 hours/week during weekdays.
• Clear written communication and the ability to give precise, constructive design feedback.
• 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.

Responsibilities

• Partner with AI researchers to identify best-in-class UI and UX patterns, and turn them into clear principles and rubrics that define what great design looks like.
• Build polished, interactive web prototypes, in code or with AI-native tools such as Cursor, v0, Lovable or Bolt, that showcase strong and 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.

Skills

Product design

Prototyping

User-centered design

Design judgment

Written communication

40 hrs/week

Motion/Animation

Tools

HTML

CSS

JavaScript

React

Tailwind

Cursor

v0

Lovable

Bolt

Framer

Job description

Mercor, an AI lab, seeks a Senior Product Designer to shape UI and UX for web and games, working directly with researchers to define what great design looks like and building high-quality prototypes in code or with AI tools to prove ideas.

This full-time, 40-hour work week role is based in the United States and positioned through Cincinnatus LLC, offering opportunities to influence cutting-edge interfaces and user experiences.