We are on a mission to reinvent how designers work in the AI era. Backed by top investors from OpenAI, Google, Stripe, Notion and Dropbox, we're building the next-generation AI design tool for product teams.

We’re hiring a Frontend Architect - WebAssembly & Bundling to own a browser-native execution environment that delivers instant dev experiences—running dependencies, tooling, and applications entirely inside the browser with strong isolation and performance.

This is a runtime and systems engineering role, not a typical frontend or OS position. You’ll set technical direction and ship production-grade platform infrastructure under real browser constraints.

What You’ll Do

Architect a browser runtime (Node-like execution, task orchestration, streaming I/O)
Build a high-performance virtual filesystem (in-memory + persistence, caching, module resolution)
Integrate and optimize JS/TS tooling pipelines
Drive performance (cold start, incremental updates, memory)
Design secure sandboxing for untrusted code
Lead architecture decisions and mentor engineers

Must-Have Requirements

8–12+ years building systems software; 3+ years owning runtime or platform architecture
Strong WebAssembly/WASM experience (ABI boundaries, memory models, host interfaces)
Deep browser platform knowledge (Workers, messaging, storage, isolation)
Runtime engineering expertise (event loops, scheduling, concurrency, streaming I/O)
Performance engineering discipline with measurable results
Security experience running untrusted code in the browser
Proven ability to architect and build production systems

Benefits

Base Salary: Above market; we've raised a considerable amount of capital and offer competitive cash compensation
Equity: Meaningful stock options
Health Insurance: Best-in-class coverage for the employee and their entire family
Location: San Francisco HQ

Frontend Architect - WebAssembly & Bundling (US)