Software Engineer, Agents (Foundation Agents)
Confirmed on the employer's own hiring board on Nov 3, 2026. First seen by Alion on Sep 16, 2026. Fieldguide scores A on the Alion truth index.
About Us
Fieldguide is establishing a new state of trust for global commerce and capital markets by automating and streamlining the work of assurance and audit practitioners-specifically in cybersecurity, privacy, and financial audits. We build software for the people who enable trust between businesses.
We're based in San Francisco, CA, and backed by Goldman Sachs Alternatives, Bessemer Venture Partners, 8VC, Floodgate, Y Combinator, and more. Over 50 of the top 100 accounting and consulting firms trust Fieldguide to power mission-critical work.
About the Role
The Foundation Agents team stewards the long-horizon agents powering the Fieldguide AI platform. We work at the frontier of AI product development: agent knowledge, evaluations, and improving quality and reliability at scale. If you're excited by long-horizon agents that do real-world work, this is the team for you.
What You’ll Own
Build and maintain agent knowledge and evaluation infrastructure for Fieldguide's long-horizon agents
Build our next generation of agents at Fieldguide, solving increasingly complex customer use cases
Perform error analysis on agent behavior and help turn findings into concrete quality improvements
Build backend systems that support agent execution, evaluation, and monitoring
Partner with senior engineers on the team to execute the platform's reliability and quality roadmap
Who You Are
You've built AI products, not just called an LLM API
You're curious about evals and error analysis. You want to understand why an agent failed, not just that it did
You're comfortable in the backend, with a bias toward reliable systems
You're motivated by long-horizon agents that do real work in production
Experience
Must-have:
Hands-on experience building AI products
Working knowledge of evals and error analysis
Backend engineering experience
Nice-to-have:
Platform engineering skills
Frontend experience
Distributed systems experience
What Should Excite You
Long-horizon agents: working on agents that do real, sustained work and not one-shot demos
Evaluation as a craft: Evals and error analysis are core to how this team improves quality
Platform-level impact: Your work shapes the reliability and quality of every agent built on top of it
Frontier problems: You're working on open problems in agent reliability that don't yet have established playbooks
Benefits
Competitive compensation with equity
Comprehensive health and wellness benefits
Flexible time off and work schedules
Technology reimbursements
401(k) plan
Twice-yearly in-person offsites across the U.S.
Wellness benefits starting on your first day
Our Values
Fearless - Inspire and break down seemingly impossible walls
Fast - Launch fast with excellence; iterate to perfection
Lovable - Deliver happiness and 11-star experiences
Owners - Execute and run the business with ownership
Win-win - Create mutual value and earn trust for life
Inclusive - Scale the best ideas with inclusive teams