Product Engineer, Platform

Reactor; San Francisco (CA); On-site; USD 140,000 - 220,000; Full time

Benefits offered by this job

Visa sponsorship

Relocation support

Job summary

Reactor in San Francisco seeks a strong full-stack engineer with deep front-end experience to design and implement interfaces for real-time world models. You will drive from data model to UI, build production-ready React/Next.js apps, and shape the API and dashboards that power our product.

This in-person role collaborates closely with product and engineering teams. You will own end-to-end delivery, curate reusable components, and contribute to live demos and internal tooling for efficiency.

Qualifications

• 4+ years as a full-stack engineer with strong front-end skills.
• Deep experience with TypeScript and React or Next.js.
• Built and maintained production React/Next.js apps with users, including state management and testing.
• Handled data model to UI flow: schema, API, front-end, production maintenance.

Responsibilities

• Design developer workflows for real-time world models from first use to production.
• Create dashboards and live demos with real data behind them.
• Define API schemas and data models end-to-end for features.
• Build reusable UI components shared across the product.
• Launch pages and demos when new models or partners go live.
• Develop internal tools to save time across the team.

Skills

TypeScript

React

Next.js

Production apps

UI/UX

API design

Relational DB

Tools

PostgreSQL

Job description

Reactor is building the inference platform for real-time world models. Our goal is to democratize access to real-time intelligence to unlock next-generation use cases in media, physical AI and omni-directional models. We already run the largest and fastest catalog of world models on the market, and work closely with all major model labs to run and optimize their world models, including Alibaba, Amazon, and NVIDIA. Our team is made of alumni from leading firms such as Apple, Meta, Amazon, Microsoft, Luma AI, Adobe, Stability AI, and more. We've raised $74M led by Lightspeed, with Amplify Partners, WNDR, NVIDIA, Sapphire, and other Tier 1 investors participating. Jeffrey Katzenberg, co-founder of DreamWorks Animation, sits on our board of directors.
Real-time world models generate a world while you steer it. How people use that, and how developers build on it, is still an open question. You'll be one of the people answering it, across every surface they touch: the product, model pages and demos, launches, and internal tools.
We're looking for a strong full-stack engineer with deep front-end experience.
We're in person in San Francisco.

What You'll Do

• Designing how developers work with real-time world models, from first use to production
• Dashboards that stay fast with real data behind them: sessions, usage, billing
• The API schemas and data models behind every feature, built end-to-end
• Reusable UI components the whole product draws from
• Launch pages and live demos, shipped the day a new model or partner goes live
• Internal tools that save the team hours every week

What We're Looking For

• 4+ years as a full-stack engineer, with front-end as your strongest side
• Deep experience with TypeScript and React or Next.js
• You've built and maintained a production React or Next.js app with real users, including the state management, performance work and testing that come with it
• You've taken a feature from data model to UI on your own: schema, API, front-end, and keeping it running in production
• Strong CSS and layout skills: responsive, accessible interfaces that hold up across screen sizes
• Deep relational database experience: schema design, query performance, Postgres or similar
• You’ve designed APIs that other engineers and customers build on
• Proven direction in UI and interaction design

Nice to Have

• Real-time features: video, WebSockets, streaming
• Salary and equity at the 99th percentile for our stage
• Visa sponsorship and relocation support
• Generous health, dental, and vision coverage