Senior Full Stack Developer (TypeScript, React, React Native)

Wearton is a personal stylist app. It finds the user's colours from one selfie, keeps their clothes in a digital closet, and says what to wear for the weather and the events of the day. Hooky, our AI stylist, answers questions in a chat. With virtual try-on, users see a piece of clothing on their own photo.
Wearton runs on iPhone and Android, on the web, as a browser extension (Chrome, Edge, Firefox, Safari) and inside ChatGPT and Claude through an MCP server. All clients are one TypeScript codebase that shares code between them.
We are a small product startup. You will work directly with the founder and own features end to end: API, database, web app, browser extension and mobile app.
What you will do
Build features across the whole stack: from an API route and a database migration on Cloudflare Workers to the React web app, the browser extension and the React Native app.
Work with LLMs and image models (OpenRouter, Google Vertex AI): prompts, structured JSON output, daily limits and cost per request.
Write automated tests with every change (Vitest, Jest, Testing Library, Maestro e2e).
Ship small changes often through GitHub Actions, and keep the API contract and docs up to date.
Use AI coding agents (Claude Code) every day as part of the workflow.
Our stack
TypeScript everywhere
Mobile: React Native, Expo, Zustand, RevenueCat
Web app and extension: React 19, Vite, Tailwind CSS v4, Manifest V3
Backend: Cloudflare Workers, D1 (SQLite) with Drizzle ORM, R2, better-auth
AI: OpenRouter (GPT, Gemini), Google Vertex AI virtual try-on, MCP
Analytics: PostHog
Requirements
5+ years of commercial development, mostly in TypeScript / JavaScript
Strong React, and production experience with React Native (Expo is a plus)
Backend experience with Node.js or serverless (Cloudflare Workers, AWS Lambda), REST API design and SQL
You write automated tests by default
Experience with LLM APIs in a production product
English B2 or higher: code, docs and communication are in English
Nice to have
Browser extensions (Chrome Manifest V3, Firefox, Safari)
App Store and Google Play releases, in-app subscriptions
Consumer apps, fashion or e-commerce
We offer
Full-time remote work
Direct work with the founder and real influence on the product
A modern stack and an AI-first engineering workflow