Principal Engineer, Duo Agent Platform

What you'll do

• Define the technical direction and six-month roadmap for a significant area of the Duo Agent Platform.
• Build a reliable orchestration layer for agent session lifecycles, tool invocations, context assembly, and concurrency.
• Write opinionated design documents and architecture narratives to ensure alignment across multi-tenant and self-managed deployments.
• Design extensibility surfaces for customers to build custom agents and connect external tools like Claude Code.
• Drive down request latency and costs while managing model selection, routing, and credit consumption.
• Define evaluation practices using offline benchmarks and online experiments to measure task completion and accuracy.
• Build governance and safety surfaces including policy-driven controls, human-in-the-loop checkpoints, and audit traceability.
• Mentor Staff and Senior Engineers while participating in the incident management on-call rotation.

What we're looking for

• 8+ years of software engineering experience.
• 3+ years of experience at a Staff, Principal, or equivalent senior technical leadership level.
• Hands-on production experience building on large language models, including agent loops, tool calling, context management, retrieval, and evaluation.
• Strong background in distributed systems, including service decomposition, fault tolerance, observability, and operational resilience.
• Experience designing human-in-the-loop controls, safety guardrails, and responsible AI practices.
• Experience mentoring senior engineers and shaping technical direction across multiple teams without direct authority.
• Proficiency in one or more of Ruby, Go, Python, or TypeScript.
• Ability to work effectively in a fully remote, globally distributed organization.