Remote Senior Backend Engineer - Defensive AI Agent Platform

Horizon3.ai; United States; On-site; USD 150,000 - 190,000; Full time

Job summary

Horizon3.ai in the United States is seeking a Senior Backend Engineer for the Defensive Agent team to build the platform on which NodeZero's defensive agents run. You'll design and implement production-ready distributed systems that scale across thousands of customer tenants while ensuring isolation and governance.

This is a platform-focused role: you’ll own the runtime, tool layer, orchestration, connector framework, and observability, enabling AI research to ship safe, verifiable agent

Responsibilities

• Own the runtime, the tool layer, the orchestration, the connector framework, and the observability.
• Collaborate with AI researchers to ship the substrate that makes their work safe and production-ready.
• Work on a platform that scales across thousands of customer tenants while maintaining isolation and governance.

Job description

Horizon3.ai in the United States is seeking a Senior Backend Engineer for the Defensive Agent team to build the platform on which NodeZero's defensive agents run. You'll design and implement production-ready distributed systems that scale across thousands of customer tenants while ensuring isolation and governance.

This is a platform-focused role: you’ll own the runtime, tool layer, orchestration, connector framework, and observability, enabling AI research to ship safe, verifiable agent