Senior Product Designer
Reactor
San Francisco, CA · Posted October 30, 2026
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Pay compared with the market
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Share of this job’s tasks that AI is already used for at work, from real usage. It is not a forecast of job loss, and a low number means no use seen yet. Source: Anthropic Economic Index.
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About the job
Senior Product Designer
Department: Engineering
Employment Type: Full Time
Location: San Francisco
Description Reactor is building the inference platform for real-time world models. We run the largest and fastest catalog of world models on the market (15+ and growing), including LingBot World 2, LTX 2.5 Realtime, and HappyOyster. Our founders, Alberto Taiuti (CEO) and Bryce Schmidtchen (CTO), met as technical leads on the early Apple Vision Pro team. Alberto went on to co-found Luma AI, now a $4B company. We've raised $59M, led by Lightspeed, with Amplify Partners, WndrCo, and NVIDIA's NVentures participating. Jeffrey Katzenberg, cofounder of Dreamworks Animation, sits on our board of directors.
Real-time video AI and world models are about to change how people interact with computers, with each other, and with the physical world. We're building that future at Reactor. This role is your chance to design how it feels to use and interact with these capabilities.
You'll own design at Reactor end-to-end. That means defining the problem, exploring solutions, shipping polished experiences, and iterating on real usage. The interfaces for this technology don't exist yet, so you won't be following established patterns. You'll be creating new ones.
What You'll Do
Own product design end-to-end: problem definition, exploration, execution, and post-launch iteration
Design experiences across web and mobile contexts
Build and maintain our design system: components, tokens, and documentation
Prototype rapidly using Figma and AI-assisted tools to validate ideas before committing to build
Collaborate closely with engineering and product to ship high-quality work, fast
Run lightweight user research and incorporate feedback into design decisions
Occasionally support brand, pitch decks, and visual assets as needed
What We're Looking For
Proven track record shipping product work. Show us things you've designed that are live and loved
Deep experience with design systems: components, tokens, and collaborating with engineers to maintain them
Strong end-to-end feature ownership in a fast-paced, ambiguous environment
A craftsperson's eye for typography, spacing, color, motion, and visual detail
Comfort with rapid prototyping and "vibe coding". You use modern tools to move fast, even if you're not writing production code
User research instincts: you talk to users, test assumptions, and let data inform your work
Strong communication skills. You can articulate design rationale and align cross-functional teams
Accessibility awareness baked into your process
Nice to Have
Familiarity with generative AI, LLMs, or real-time media UX patterns
Frontend literacy: React, TypeScript, or CSS knowledge that helps you collaborate with engineers
Motion design experience (Framer Motion, After Effects, or similar)
Graphic design chops for brand and marketing needs
Benefits
Competitive SF salary and meaningful early equity
Visa sponsorship and relocation support
Generous health, dental, and vision coverage