Software Engineer, Agent Architecture at Sierra

Sierra creates a platform helping businesses build better, more human customer experiences with AI. The company operates primarily in-person from San Francisco. Co-founders Bret Taylor (Board Chair of OpenAI, former Salesforce co-CEO, Facebook CTO, Google Maps co-creator) and Clay Bavor (18 years at Google, led Google Labs) lead the company.

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?

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.

Required Qualifications

Passion for frontier AI products

Strong software engineering fundamentals and production systems experience

High-agency motivation in autonomous environments

4+ years hands-on building production systems

Computer Science degree or equivalent experience

Preferred Qualifications

Experience building AI-powered systems or agent frameworks

Experience with retrieval, evaluation systems, or LLM-based applications

Experience building developer platforms or SDKs

Go and TypeScript proficiency

Benefits: Unlimited PTO, medical/dental/vision, life/disability insurance, 401(k) match, parental leave, fertility benefits, discretionary stipend.