We're building a self-improving IDE for running coding agents in parallel. Tens of thousands of engineers use it as their main IDE, at companies like Netflix, DoorDash and Wix. It's source-available: https://github.com/superset-sh/superset
We're 4 people, including 3 ex-YC CTOs. The work goes from the pty and stream transport up to the UI, all TypeScript. You'd own big features end to end and likely ship something in your first week.
Interviews: a 15 min call, 1 hr TypeScript, 1 hr system design, then a week with us in SF. We tell you where you stand within 48 hours of each step.