Principal Engineer, Back-End

Get to Know Us

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.

What You’ll Do

We are hiring a Principal Backend Engineer to serve as the Technical Lead You’ll be responsible for shaping the systems, architecture, and technical direction behind a product that helps customers understand and prioritize what matters most to secure their environments. This role is for a senior individual contributor who leads through technical judgment, cross-functional partnership, and execution.

The right candidate will be equally comfortable translating ambiguous product goals into concrete technical roadmaps, writing production code (primarily backend but with an understanding for frontend as well), mentoring other engineers, and influencing decisions across multiple projects and partner teams. Successful candidates will be product min...