Senior Full-Stack Engineer (AI Development Platform)

Job Description

The Opportunity

We're building the AI-powered operating system for the next generation of software creation—where traditional engineers and non-technical builders (think lawyers, designers, and founders) can collaborate, create, and deploy AI-driven applications using plain English.

This isn’t just another IDE or low-code tool. We’re threading an impossible needle:

Deep enough for engineers who demand power and flexibility.

Accessible enough for domain experts who’ve never written a line of code.

Compelling enough to make both groups wonder how they ever worked without it.

If you’ve ever wanted to architect systems that redefine how software is built—and see your work used by hundreds of thousands of builders—this is your shot.What You’ll Do

Architect foundational systems for collaborative AI development (think Google Docs meets VSCode, with real-time multi-user editing via Y.js).

Build and scale LLM orchestration that actually works—low latency, debuggable, and reliable for both real-time and long-running AI agents.

Solve hard problems, like designing an executor that handles arbitrarily long-running agents, scales from zero to thousands in seconds, and remains traceable for end users.

Write a ton of code (mostly TypeScript/Next.js) while keeping our AWS/Cloudflare stack humming.

Wear multiple hats: debug user issues, make product calls on the fly, and help shape the future of AI development.Who You Are

4+ years of experience building real products used by real people.

An AI-curious engineer with hands-on experience building with LLMs (bonus if you’ve worked on agents or orchestration).

Technical chops: Strong TypeScript skills (our whole stack is TS), front-end fluency (React/Next.js), and solid system design intuition.

A builder at heart: You’ve shipped side projects, contributed to OSS, or have a presence that shows you love creating things.

Low ego, high output: You fix problems before being asked, care more about users than your code, and thrive in fast-moving environments.

Ex-founder/CTO? Even better—our team is stacked with former startup leaders who’ve raised VC, but we’re open to exceptional engineers who just love to build.Nice-to-Haves

STEM degree from a top-tier school.

Experience with real-time collaboration tools (CRDTs, WebSockets, etc.).

A knack for making complex systems feel simple.Traits We Avoid

Unfounded arrogance (we’re a low-ego team).

Poor communicators (we move fast—clear, concise wins).Why Join?

Work with ex-CTOs and founders who’ve built and scaled before.

Shape the AI operating system that will define the next era of software.

Backed by $30M in seed funding (largest in YC history).

300K+ signups and growing fast.

Full-time