Staff/Senior Software Engineer, Agent Engineering (Helios)

Helios is building Proxi, a platform that uses frontier AI and public-sector expertise to help organizations understand and act on government activity in complex and regulated environments. The Staff/Senior Software Engineer will own and advance the production agent runtime, including long-running workflows, tool use, memory, retrieval, evaluation, security, and reliable agent behavior.

Responsibilities:

• Own Proxi’s agent runtime and strengthen foundations for building new agent-driven products
• Build the systems that allow agents to own long-running work from assignment through completion. Agent activity should remain visible, steerable, and connected to the relevant project, people, evidence, deadlines, and deliverables in Action Rail
• Build the tool and action framework agents use to interact with internal systems and external services safely
• Connect agents to Proxi’s retrieval and knowledge systems so reasoning, memory, citations, and generated artifacts remain grounded in authoritative evidence
• Improve the evaluation and release discipline for agent behavior, traces and simulations to improve quality while controlling latency, cost, and risk