Software Architect

Crossing Hurdles is a global recruitment consultancy partnering with a startup building a next-generation AI-native design platform where every visual edit becomes real, executable code in real time. The team consists of 19 members and has raised $44M, backed by leaders from Microsoft, OpenAI, Perplexity, and Notion.

About the role

This is an individual contributor (IC) role focused on WebAssembly (WASM) and bundling within a lean, high-growth startup environment. You will collaborate with a global team, including overlap with the India team (early mornings/evenings in the US).

Responsibilities

• Architect a browser-native runtime, including Node-like execution, task orchestration, and streaming I/O.
• Design and build a high-performance virtual filesystem with in-memory persistence, caching, and module resolution.
• Integrate and optimize bundling and tooling pipelines (JS/TS).
• Drive measurable performance improvements across execution paths (cold start, incremental builds, memory).
• Design secure sandboxing and isolation for untrusted code execution in the browser.
• Set technical direction for runtime architecture.
• Mentor engineers while remaining a hands-on individual contributor.

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, including ABI boundaries, memory models, and 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 (e.g., cold start, incremental builds, memory).
• Security experience running untrusted code in the browser.
• Experience building high-performance virtual filesystems.
• 3+ years owning runtime/platform architecture.
• Willingness to overlap with the India team (early mornings/evenings in the US).

Pay

$100k - $300k + Equity

Location

US (Remote)