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Software Engineer, Agent Runtime

SierraSan Francisco, CAEngineering
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Salary
$230K - $390K USD
Job type
Full-time
Posted
27 Mar 2026
Status
Open · checked 7d ago

About this role

Role Overview

Sierra is currently seeking a Software Engineer, Agent Runtime to join the team in San Francisco, CA. This full-time, in-person position is well-suited for a software professional who wants to build core AI systems and shape the frontier of customer-facing agent technology.

Key Responsibilities

Construct the core systems that power autonomous agents, focusing on the Agent SDK, orchestration engine, and runtime primitives.
Shape the agentic loop by developing primitives that keep agents steerable, verifiable, conversational, and adaptive.
Enhance retrieval and grounding mechanisms to guarantee that agents deliver accurate and dependable responses.
Design evaluation frameworks that enable the team and customers to measure and elevate agent quality over time.

Requirements

A genuine enthusiasm for working at the forefront of artificial intelligence products.
Solid software engineering fundamentals alongside practical experience in developing production systems.
High agency and motivation to achieve outcomes within a high-autonomy workplace.
Minimum of four years of hands-on experience building production software products and systems.
A degree in Computer Science or a related discipline, or equivalent practical professional experience.

Nice to Have

Background in constructing AI-driven systems or agent frameworks.
Familiarity with retrieval mechanisms, evaluation systems, or applications powered by large language models.
Experience designing developer platforms or software development kits.
Working knowledge of Go and TypeScript.

Skills and Tools

TypeScript
Large Language Models (LLMs)
Agent SDK development and orchestration engines
Retrieval and grounding systems
Evaluation frameworks

Salary and Benefits

Annual salary range spanning from $230,000 to $390,000 USD
Flexible, unlimited paid time off policy
Comprehensive medical, dental, and vision coverage for employees and their families
Life insurance and disability benefits
Retirement plan options based on the country of employment
Parental leave alongside fertility and family building benefits via Carrot
Daily lunch, snacks, and coffee provided at the office
Discretionary benefit stipend and free alphorn lessons
Participation in company equity plans for eligible full-time employees

About the Company

Sierra operates as a leading platform for customer-facing AI agents, partnering with major global brands like The GAP, Rocket Mortgage, SoFi, Sutter Health, and SoftBank. The enterprise is primarily based in-person in San Francisco, with expanding offices across North America, Europe, and Asia. Co-founded by Bret Taylor and Clay Bavor, the organization is driven by core values emphasizing trust, customer obsession, craftsmanship, intensity, and family support.

How to Apply

Interested candidates should visit the official Sierra careers page to submit an application for this role.

Skills and tech stack

Questions candidates ask

What is the salary range for the Software Engineer, Agent Runtime position?

The annual salary for this role ranges from $230,000 to $390,000 USD.

Where is this job located?

This position is based in-person at Sierra's office in San Francisco, California.

What level of experience is required?

Applicants need a minimum of four years of hands-on experience building production products and systems, along with a degree in Computer Science or equivalent professional experience.

What skills and technologies are mentioned for the role?

Key skills include TypeScript, Large Language Models (LLMs), production system engineering, and experience with agent frameworks or SDKs.

What benefits does Sierra offer to full-time employees?

Benefits include flexible unlimited PTO, medical, dental, vision, life insurance, disability benefits, retirement plans, parental leave, Carrot family building benefits, daily office lunch and snacks, a discretionary stipend, and equity plans.

Ready to apply?

The application is on the official Sierra careers page.

Apply on company site