Software Engineer, Agent Runtime
About The Position
Sierra is hiring a Software Engineer to build the core systems that power customer-facing AI agents. The role works on the Agent SDK, including its orchestration engine, runtime, and primitives that define how agents reason, take actions, and interact with users and systems. The engineer will help design agent behavior that is steerable and verifiable while remaining conversational and adaptive, improve retrieval and grounding so agents provide accurate and trustworthy responses, and build evaluation frameworks that help Sierra and its customers measure and improve agent quality over time. Sierra is primarily an in-person company based in San Francisco, with growing offices across North America, Europe, and Asia. The company emphasizes trust, customer obsession, craftsmanship, intensity, and balancing family. The position is part of a high-autonomy culture focused on building AI products.
Requirements
- Passion for being on the frontier of AI products.
- Strong software engineering fundamentals and experience building production systems.
- Motivation and high agency to drive outcomes in a high-autonomy culture.
- At least 4 years of hands-on experience building production products and systems.
- A degree in Computer Science or a related field, or equivalent professional experience.
Nice To Haves
- Experience building AI-powered systems or agent frameworks.
- Experience with retrieval, evaluation systems, or LLM-based applications.
- Experience building developer platforms or SDKs.
- Experience with Go and TypeScript.
Responsibilities
- Build core systems that power agents, including the Agent SDK, orchestration engine, runtime, and primitives.
- Design how agents operate in real-world environments, balancing steerability and verifiability with conversational and adaptive behavior.
- Build retrieval and grounding systems that help agents provide accurate, trustworthy responses.
- Design evaluation frameworks to measure and improve agent quality over time.
Benefits
- Flexible (unlimited) paid time off.
- Medical, dental, and vision benefits for employees and their families.
- Life insurance and disability benefits.
- Retirement plan dependent on country of employment.
- Parental leave.
- Fertility and family-building benefits through Carrot.
- Lunch, snacks, and coffee.
- Discretionary benefit stipend.
- Free alphorn lessons.
- Eligible full-time employees can participate in Sierra's equity plans, subject to applicable plans and policies.
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What This Job Offers
Job Type
Full-time
Career Level
Mid Level
