Join Sierra as a Software Engineer to build core systems for AI agents in a collaborative, innovative environment.
Posted by employer 1 day ago
First seen on Joblaze 3 hours ago
Last verified on the company career page 3 hours ago
Skills & Technologies
What you'll build
- Build the core systems that power agents
- Design the agentic loop
- Improve retrieval and grounding
- Build evaluation systems
Must have
- Strong software engineering fundamentals
- 4+ years hands-on experience building production products
- Degree in Computer Science or related field
Nice to have
- Experience building AI-powered systems
- Experience with retrieval, evaluation systems
- Experience building developer platforms or SDKs
- Experience with Go and TypeScript
Requirements
- Experience
- 4+ years
- Education
- Bachelor's degree
Not disclosed in this posting: compensation, visa sponsorship.
Benefits
Joblaze summary
In this role, the Software Engineer will focus on developing the core systems that drive AI agents, including the orchestration engine and runtime. Key skills include strong software engineering fundamentals, with a preference for experience in building AI-powered systems and familiarity with languages like Go and Typescript. This position is ideal for someone with over four years of hands-on experience in production environments, particularly those who thrive in a high-autonomy culture. Sierra emphasizes a collaborative and supportive work environment, reflecting its commitment to balancing intensity with personal well-being.
Joblaze insights
- Listed today — first seen on Joblaze October 23, 2026. Last confirmed on Sierra's careers page October 23, 2026.
- This exact title is also open at 1 other location at Sierra: San Francisco, CA.
- AI/ML appears in 53.8% of 478 comparable mid ai/ml roles in United States; Go appears in 13% of 478 comparable mid ai/ml roles in United States.
Quick facts
- Is the Software Engineer, Agent Runtime role remote?
- No — this is an on-site role in San Francisco, CA, United States.
- How much experience is required?
- At least 4 years of relevant experience for this Software Engineer, Agent Runtime role.
- Where is the role based?
- Sierra is hiring for this position in San Francisco, CA, United States.
- What's the tech stack?
- Joblaze extracted these technologies from the posting: AI/ML, Go, TypeScript.
- What seniority level is this role?
- Sierra targets mid-level candidates for this position.
- Is this full-time or contract?
- Full-time for this Software Engineer, Agent Runtime role at Sierra.
From the original posting
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.
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.
Even better
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.
Our values
Trust: We build trust with our customers with our accountability, empathy, quality, and responsiveness. We build trust in AI by making it more accessible, safe, and useful. We build trust with each other by showing up for each other professionally and personally, creating an environment that enables all of us to do our best work.
Flexible (unlimited) paid time off
Life insurance and disability benefits
Retirement plan dependent on country of employment
Parental leave
Fertility and family building benefits through Carrot
Free alphorn lessons
Standard company text repeated across Sierra's postings is omitted here.