Senior Product Designer: Prototyping & AI UI Expert

Obsidian; San Francisco (CA); Remote; USD 140,000 - 190,000; Full time

Job summary

Cincinnatus LLC places a senior product designer with a leading AI lab to shape UI/UX for web and games. You will develop high-quality prototypes, pairing design judgment with rapid prototyping in code or AI tools, and provide detailed feedback on layouts, interactions, and polish.

You will collaborate with researchers to define great interfaces, explore diverse visual styles, and help raise the quality bar across projects.

Qualifications

• 7+ years of experience as product designer, design lead, or design engineer in product- or design-led environments.
• Hands-on prototyping in code (HTML, CSS, JavaScript, React, Tailwind) or with AI-native tools (Cursor, v0, Lovable, Bolt, Framer).
• Strong grounding in user-centered and interaction design with rapid prototyping.
• Senior-level design judgment with ability to set direction and justify decisions.
• Ability to commit to 40 hours/week.
• Clear written communication and constructive feedback.

Responsibilities

• Partner with AI researchers to define best-in-class UI/UX patterns and translate them into principles and rubrics.

Skills

Prototyping skills

UI/UX design

Frontend development

Written communication

40 hours/week

Tools

Cursor

v0

Lovable

Bolt

Framer

Job description

Cincinnatus LLC places a senior product designer with a leading AI lab to shape UI/UX for web and games. You will develop high-quality prototypes, pairing design judgment with rapid prototyping in code or AI tools, and provide detailed feedback on layouts, interactions, and polish.

You will collaborate with researchers to define great interfaces, explore diverse visual styles, and help raise the quality bar across projects.