Y Combinator Software Infrastructure Engineer
Overview
We’re seeking a Software Infrastructure Engineer for our NYC team (in-person) so teams across Ultra can get safe, compliant access to the data they need to do their jobs. We don't want engineering to be the bottleneck on every stats page or internal tool. You’ll own the auth, permissions, and data-access platform that lets people build quickly and confidently.
Who You Are
- You have 5+ years of professional software development experience
- You’re dangerous with LLMs because you know when they’re wrong
- You’ve thought hard about authentication, authorization, and misbehaving agents
- You’re a software generalist across systems, proficient in Python, and know when to build vs buy
- You ship production-quality infrastructure as part of a software team
- You can look at a backlog of “we need access to X” requests and pick the highest-leverage platform investment
What You’ll Do
- Own Ultra’s internal authentication and authorization system
- Support software engineers and vibe-coders so everyone can ship code safely and quickly
- Onboard new data sources and work with their permission models
- Turn compliance requirements into enforceable platform controls
Bonus Points
- You’ve built a comprehensive authentication and authorization system at another company
- You have strong opinions about the best way to implement RBAC (and its limitations)