You will architect a browser-native execution environment that delivers instant development experiences by running dependencies and tooling entirely inside the browser. This runtime and systems engineering role involves building a high-performance virtual filesystem and secure sandboxing. You will set the technical direction for platform infrastructure to reinvent how product teams work.
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San Francisco, United States$100K – $300K + Equity
Staff Frontend Engineer – WebAssembly & Bundling at well-funded AI design startup
Are you a systems expert looking to push the limits of the browser? Join a top-tier team building the next generation of AI-powered design tools. We are looking for a Staff Engineer to architect a browser-native execution environment using WebAssembly and high-performance virtual filesystems. This is a rare opportunity to own the runtime and systems architecture for a platform backed by the industry's most influential investors. If you have 8+ years of experience in systems software and a passion for WASM, this is the role for you.
Overview
Role overview
Company
About the company
Well-funded AI design startup
Responsibilities
What you will do
- Architect a Node-like browser runtime including task orchestration, streaming I/O, and a high-performance virtual filesystem.
- Integrate and optimize JavaScript/TypeScript tooling pipelines to drive measurable improvements in cold start and memory performance.
- Design and implement secure sandboxing environments for running untrusted code with strong isolation under real browser constraints.
Candidate profile
Who this is a fit for
- Has 8-12+ years of experience building systems software with a deep focus on WebAssembly memory models and host interfaces.
- Possesses expert-level knowledge of browser platform internals including Workers, messaging, and event loop scheduling.
- Demonstrates a proven track record of architecting production-grade platform infrastructure at a high-growth technology company.
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What makes it remarkable
Why this role is remarkable
- Work on cutting-edge browser-native runtime and systems engineering problems that push the boundaries of WebAssembly.
- Join a high-talent density team of builders and ex-founders backed by the world's most prestigious technology investors.
- Influence the foundational architecture of a next-generation design platform during a period of rapid technical innovation.
Jack & Jill
How Jack & Jill work together
I get to know what you’re great at, then find roles you’d never find yourself.Ok, I'll go first. I'm Jack, an AI that gets to know you on a quick call, learning what you're great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support.
I recruit from Jack’s network and make the intro when I spot a great match.And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate.
Meet Jack
Jack gets to know what you're great at and what you want next, then searches 14 million jobs daily and introduces you directly to hiring managers.
How does this work?
Jack's an AI agent for job searching and career coaching. He works for you.
Jill is the AI recruiter working for the company. She recruits from Jack's network.
If it's a match and the company wants to meet you, they'll make the intro. In the meantime, if you'd like, Jack will send you excellent alternatives.
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