Horizon3 AI
Horizon3 AI builds NodeZero, a proactive security platform that autonomously performs penetration testing and validates attack paths across on‑prem, cloud, and hybrid environments. The company sells its software by subscription to security and IT teams at enterprises and government agencies, helping prioritize and verify fixes. Founded in 2019 and headquartered in San Francisco, it is privately held and serves customers across regulated industries and the public sector.
Open Positions at Horizon3 AI
48 open positions
Lead the development of production-quality offensive security capabilities for Google Cloud within NodeZero. You will research GCP attack paths, automate realistic exploits in Python, and shape the company’s GCP offensive security strategy.
Lead the research and development of production-quality Kubernetes offensive security capabilities for Horizon3’s NodeZero autonomous penetration-testing platform. This senior role combines attack research, Python engineering, technical leadership, and customer-facing validation in a fully remote environment.
Build production-grade offensive security capabilities for Oracle Cloud Infrastructure (OCI) within Horizon3.ai’s autonomous NodeZero platform. You’ll research cloud attack paths, develop Python-based attack logic, and shape how OCI environments are assessed at scale.
Lead the architecture and delivery of backend systems powering Horizon3.ai’s internal autonomous-pentesting capabilities. This hands-on Staff Engineer role combines large-scale data processing, ETL, APIs, GraphQL, relational modeling, and technical leadership across teams.
Senior Software Engineer responsible for building customer-facing cybersecurity product capabilities across backend services, APIs, and modern web applications. The role is approximately 80% backend and 20% frontend, with substantial ownership of projects from technical design through delivery.
Lead the technical direction of backend systems powering Horizon3’s autonomous penetration-testing platform. This hands-on Staff Software Engineer role combines production coding, architecture, cross-team leadership, mentoring, and customer-focused product development.
Principal Backend Engineer leading the technical direction of Horizon3’s Enterprise Platform, building foundational multi-tenant services for licensing, account administration, provisioning, notifications, and asset workflows. This is a hands-on, company-wide individual contributor role focused on architecture, reliability, and mentoring without formal people management.
Build the distributed platform that makes autonomous defensive agents safe, observable, and production-ready across thousands of customer tenants. This senior full-stack role combines deep backend systems work with React and TypeScript interfaces for operators managing long-running security workflows.
Build secure backend services and APIs that power NodeZero’s organization administration experience, including access controls, account hierarchies, settings, and audit logs. This fully remote role offers end-to-end ownership of production features and collaboration across Product and engineering teams.
Senior Software Engineer building and operating reliable integrations between Horizon3’s NodeZero platform and enterprise security, SIEM, SOAR, and ITSM tools. The role combines backend development, integration architecture, production troubleshooting, and partner collaboration.
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