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Matter Intelligence

Founding Fullstack Engineer (Generalist) - Known

Matter Intelligence, San Francisco, California, United States, 94199

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Location San Francisco

Employment Type Full time

Location Type On-site

Department Known Co

About the role You’ll work across the Known product surface: mobile features, web backend, and API integrations. You’ll ship quickly, leverage AI coding tools (e.g. Cursor, Copilot), and help us deliver a polished, consumer‑grade experience.

Responsibilities

Build and iterate on mobile features with React Native.

Extend and maintain backend APIs in Node.js/TypeScript.

Integrate with third‑party APIs (OpenAI/Anthropic, reservations, payments, messaging).

Contribute to frontend components in React (web app).

Collaborate with AI/ML engineers to expose model‑powered features via APIs/UI.

Requirements

4+ years as a fullstack or frontend/backend engineer.

Strong with TypeScript, React, React Native, Node.js.

Experience with API design, integration, and scaling.

Startup mindset: comfortable working across the stack and learning fast.

Example Projects

Build mobile onboarding flow with AI-assisted profile setup.

Integrate payments and reservations APIs for seamless date planning.

Create personalized UI components powered by ML model outputs.

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