Sierra
Software Engineer, Agent Runtime
$230K–$390K
San Francisco, CA · On-site · Full-time · Posted Oct 22, 2026
- Experience
- 4+ years hands-on experience building production products and systems.
- Education
- Degree in Computer Science or related field, or equivalent professional experience.
About the job
Build the runtime and core systems for customer-facing AI agents, including orchestration, retrieval, and evaluation.
What you'll do
- Build the Agent SDK, including the orchestration engine, runtime, and primitives for agent reasoning and actions.
- Design agent workflows that are steerable, verifiable, conversational, and adaptive; improve retrieval and grounding.
- Create evaluation frameworks to measure and improve agent quality.
What they ask for
- Strong software engineering fundamentals and experience building production systems.
- Motivation and high agency to drive outcomes in a high-autonomy culture.
- Passion for frontier AI products.
Nice to have
- Experience building AI-powered systems or agent frameworks, retrieval, evaluation systems, or LLM-based applications.
- Experience building developer platforms or SDKs; experience with Go and Typescript.
Pay
$230K – $390K (base salary)
Tools
Go, Typescript
AI focus
Develop AI agent runtime and orchestration, retrieval and grounding, and evaluation systems.
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