Crossing Hurdles is a global recruitment consultancy partnering with a startup who is building a next-generation AI-native design platform where every visual edit becomes real, executable code in real time with lean team of 19 members and funding of $44M backed by leaders from Microsoft, OpenAI, Perplexity, and Notion.
Role: Staff Frontend Engineer – WebAssembly & Bundling
Compensation: $100k - $300k + Equity
Location: US (Remote)
Experience: 8–12+ years (3+ years owning runtime/platform architecture)
Tech Stack: WebAssembly (WASM), Browser Runtime Systems
Work Model: IC role (Not a people-management position)
Collaboration: Willing to overlap with the India team (early mornings/evenings in US)
Requirements
- 8+ years of experience building systems software in high-growth tech environments
- Experience as a Full-Stack or Frontend Engineer
- Strong WebAssembly (WASM) expertise — ABI boundaries, memory models, host interfaces
- Deep browser platform knowledge (Workers, messaging, storage, isolation)
- Runtime engineering expertise (event loops, scheduling, concurrency, streaming I/O)
- Experience integrating and optimizing JS/TS tooling pipelines
- Performance engineering discipline with measurable improvements (cold start, incremental builds, memory)
- Security experience running untrusted code in the browser
- Experience building high-performance virtual filesystems (in-memory + persistence, caching, module resolution)
Roles & Responsibilities
- Architect a browser-native runtime (Node-like execution, task orchestration, streaming I/O)
- Design and build a high-performance virtual filesystem
- Integrate and optimize bundling and tooling pipelines
- Drive measurable performance improvements across execution paths
- Design secure sandboxing and isolation for untrusted code execution
- Set technical direction for runtime architecture
- Mentor engineers while remaining a hands-on individual contributor