Staff Frontend Architect (WebAssembly & Runtime Systems)

Map Ssg

2d•$100,000 - $300,000•Remote

About The Position

A well-funded, early-stage AI product company is building a next-generation browser-native platform for product and design teams. Backed by top-tier investors and led by experienced founders, the team is reinventing how modern tooling runs in the browser. We’re hiring a Staff Frontend Architect to own a browser-native execution environment capable of running dependencies, tooling, and applications entirely inside the browser with strong isolation and performance. This is a runtime / systems engineering role — not a traditional frontend position. You’ll define technical direction and ship production-grade platform infrastructure under real browser constraints.

Requirements

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

Nice To Haves

Experience building with WebAssembly at a high-growth tech company
Comfortable operating in early-stage, high-ownership environments
Excited to work alongside high-talent-density product and frontend engineers

Responsibilities

Architect a browser-based 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 improvements (cold start, incremental updates, memory usage)
Design secure sandboxing for untrusted code
Lead architectural decisions and mentor engineers