Runtime
Build and run internal agents, without managing the infrastructure
What Runtime does
Runtime (runtm.com) gives engineering teams control and visibility to enable anyone in their org to use coding agents securely. Eng leaders rolling out coding agents have no way to see what's happening, set boundaries, or safely let non-engineers use them. We provide sandboxed environments, session-level observability, and configurable guardrails so anyone on your team can ship with coding agents without breaking prod. We're live with fast-growing YC scaleups empowering their Engineers, PMs, designers, marketers, and ops to contribute to their codebase or build prod-grade zero-to-one apps.
1 open role
What the role involves
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 with our platform, ship production code, and start owning large parts of our infrastructure First 6 months: improve reliability of coding agent harnesses, bring on new sandbox providers, lead the architecture for our multi-cloud micro-VM sandbox infrastructure, support 50+ integrations, contribute to our core OSS project Work across the full stack, from sandbox infrastructure to developer-facing product Shape technical direction alongside the founding team What We're Looking For Experience building and scaling distributed systems or complex cloud infrastructure. Containerized infra (Docker, K8s) and developer tooling experience are a strong signal Side projects or professional work involving LLM agents Daily use of coding agents for software development Comfort with ambiguity and moving fast in a small team Genuine interest in coding agents, the future of software development, and sandbox environments Willingness to learn and iterate quickly. This matters more than any specific tech stack
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Company facts compiled from public sources and last refreshed 9 September 2026. Details change; treat the company’s own site as the authority.