Software Engineer, Agent Architecture

Sierra • San Francisco, CA

8d • Onsite

About The Position

At Sierra, we’re creating a platform to help businesses build better, more human customer experiences with AI. We are primarily an in-person company based in San Francisco, with growing offices in Atlanta, New York, London, Paris, Madrid, Munich, Singapore, Japan, and Sydney. We are guided by a set of values that are at the core of our actions and define our culture: Trust, Customer Obsession, Craftsmanship, Intensity, and Family. These values are the foundation of our work, and we are committed to upholding them in everything we do. Our co-founders are Bret Taylor and Clay Bavor . Bret currently serves as Board Chair of OpenAI. Previously, he was co-CEO of Salesforce (which had acquired the company he founded, Quip) and CTO of Facebook. Bret was also one of Google's earliest product managers and co-creator of Google Maps. Before founding Sierra, Clay spent 18 years at Google, where he most recently led Google Labs. Earlier, he started and led Google’s AR/VR effort, Project Starline, and Google Lens. Before that, Clay led the product and design teams for Google Workspace. 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.

Requirements

• A 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.
• 4+ years hands-on experience building production products and systems.
• Degree in Computer Science or 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 the core systems that power agents.
• 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.
• Define how agents operate in real-world environments.
• Improve retrieval and grounding.
• Build systems that ensure agents provide accurate, trustworthy responses by effectively retrieving and using knowledge.
• Build evaluation systems.
• Design frameworks that allow us and our customers to measure and improve agent quality over time.

Benefits

• Flexible (Unlimited) Paid Time Off
• Medical, Dental, and Vision benefits for you and your family
• Life Insurance and Disability Benefits
• Retirement Plan (e.g., 401K, pension) with Sierra match
• Parental Leave
• Fertility and family building benefits through Carrot
• Lunch, as well as delicious snacks and coffee to keep you energized
• Discretionary Benefit Stipend giving people the ability to spend where it matters most
• Free alphorn lessons

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level