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Founding Engineer, Agent Infrastructure
Cognition
San Francisco, CAOn-siteFull-timeSenior5+ years$210,000 - $290,000 + equity
We're a small team building an AI software engineer. This role owns the infrastructure the agent actually runs on — sandboxing, tool execution, and the feedback loops that make it reliable.
Requirements
- 5+ years shipping production systems, ideally at an early-stage startup
- Strong opinions about agent architectures — planning, tool use, memory
- Comfortable owning a system end to end with minimal process
Responsibilities
- Build the sandboxed execution environment our coding agent runs in
- Design the tool-calling and context-management layer
- Ship weekly — this team moves fast and argues about tradeoffs in code
Skills
- TypeScript
- Python
- LangChain
- RAG
- Distributed systems
- Docker