Founding Engineer at Runtime

About Runtime We manage sandboxed coding agents that adopt companies' best practices. We're building the infrastructure layer that makes AI coding agents safe, reliable, and aligned with how teams actually work. We're already working with a hyper-growth unicorn customer and Series B - C YC scaleups and we're just getting started. Why We Started Runtime After Mentum (YC S21) was acquired, Gus (CEO) personally shipped 4 full-stack products in 3 months using coding agents. When I tried to roll the same workflow out to the rest of the team, it fell apart: Most PRs were unmergeable slop, every repo required an engineer doing one-off local setup, skills and context lived in one person's head, and there was no safe way for a PM to touch a real codebase without risking a bad deploy or a secrets leak. Carlos (CTO) comes from building agentic reconciliation systems at Modern Treasury and had a similar experience when enabling his support team use Devin. About the Role We're looking for a founding engineer to join us in San Francisco. You'll be one of the first hires with an outsized impact on what we build, how we build it, and the culture we create. What You'll Do First month: get hands-on