Horizon3.ai is a fast-growing, remote cybersecurity company dedicated to the mission of enabling organizations to proactively find, fix and verify exploitable attack vectors before criminals exploit them. Our flagship product, the NodeZeroTM platform, delivers production-safe autonomous pentests and other key assessment operations that scale across the largest internal, external, cloud, and hybrid cloud environments. NodeZero has been adopted by organizations of all sizes, from small educational institutions to government agencies and Global 100 enterprises.
It is used by IT Ops/SecOps teams, consulting pentesters, and MSSPs and MSPs.
We are a fusion of former U.S. Special Operations cyber operators, startup engineers & operators, and formerly frustrated cybersecurity practitioners. We're committed to helping solve our common security problems: ineffective security tools and false positives, resulting in alert fatigue, blind spots, "checkbox” security culture, cybersecurity skills shortage, and the long lead time and expense of hiring outside consultants. Collectively, we are a team of learn it alls, committed to a culture of respect, collaboration, ownership, and results.
An Overview
We're seeking a Senior Attack Engineer who blends deep software engineering expertise with a passion for cybersecurity. In this role, you’ll independently lead complex internal network and Active Directory attack projects in NodeZero, our autonomous pentesting platform.
Internal enterprise networks and Active Directory remain key targets in modern breaches, and it is exactly where our customers most need NodeZero to find and safely prove exploitable attack paths. The environments we operate in are hardening fast, while tradecraft continues to evolve across network protocols, identity systems, management planes, and hybrid environments. We need someone who can research and weaponize real-world vulnerabilities and misconfigurations into reliable product capabilities.
You'll design and build production-grade systems that drive the offensive capabilities of the NodeZero platform. You'll own complex attack capabilities from research and technical design through production delivery and ongoing operation, making consequential technical decisions within the internal network scope. You'll also strengthen the team through proactive mentorship, thoughtful code reviews, and improvements to our engineering and research practices.
This is not consulting or manual pentesting. The goal is to turn cutting-edge, often manual techniques into safe, reliable, repeatable autonomous attacks that scale across the largest internal environments in the world. If you love both breaking internal network infrastructure and building scalable software to automate it, this is the seat.