Software Engineer, Agent Runtime

Sierra · San Francisco

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Company
Sierra
Location
San Francisco
Employment type
Full-time
Posted
October 22, 2026

About this job

WHAT YOU'LL DO - Build the core systems that power agents. You’ll work on the Agent SDK — the orchestration engine, runtime, and primitives that define how agents reason, take actions, and interact with users and systems. - Design the agentic loop. What primitives do we need to build agents that are steerable and verifiable, while still conversational and adaptive? You’ll help define how agents operate in real-world environments. - Improve retrieval and grounding. You’ll build systems that ensure agents provide accurate, trustworthy responses by effectively retrieving and using knowledge. - Build evaluation systems. You’ll design frameworks that allow us and our customers to measure and improve agent quality over time. WHAT YOU'LL BRING - A passion for being on the frontier of AI products.…

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