Who we are:
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.
As a remote first company, we require minimum 25Mbps consumer grade broadband connection.
SkillBridge Program OverviewThe DoD SkillBridge Program provides transitioning service members the opportunity to gain hands-on civilian work experience during their final months of military service, while continuing to receive military pay and benefits. Participants may spend up to 180 days (programs typically run up to 120 days at Horizon3.ai) in full-time training with an approved industry partner.
Horizon3.ai is an authorized DoD SkillBridge partner and has invested in this program since our earliest days. One of our first SkillBridge participants joined us in 2020, when the company was still in its infancy. Today, SkillBridge is a core part of how we support transitioning service members and build the next generation of cybersecurity talent.
What You’ll Do (Attack Engineering Track)SkillBridge participants at Horizon3.ai work directly alongside our Attack Engineering and Vulnerability Research teams on real-world offensive security problems — not simulated exercises.
This program is hands-on, operator-driven, and designed to help you build experience in the same technical areas as our full-time Attack Engineers.
During the program, you may:
Onboard into Horizon3.ai’s offensive engineering environment and workflows
Develop software primarily in Python, focused on offensive automation
Contribute to the development of attack modules that emulate real adversary behavior
Assist with vulnerability research, exploit validation, and proof-of-concept development
Learn how tradecraft is translated into safe, scalable autonomous pentesting capabilities
Gain exposure to attacking modern enterprise environments, including Active Directory, cloud, and hybrid networks
Collaborate with senior offensive security leaders and engineers — many of whom are veterans themselves
Participants receive ongoing mentorship, feedback, and support throughout the program.
What We’re Looking ForThis program is a strong fit for transitioning service members who:
Are within their final months of active-duty service and approved for SkillBridge
Have a strong interest in offensive security, red teaming, penetration testing, or vulnerability research
Bring a mission-driven mindset, ownership mentality, and bias for action
Have foundational technical skills in areas like scripting, networking, cyber operations, or exploit development
Are eager to learn, collaborate, and contribute to real-world attack engineering challenges
You do not need prior commercial software experience to be successful - curiosity, discipline, and adaptability matter most.
How to ApplyHorizon3.ai is an approved SkillBridge organization. If you are a transitioning service member interested in participating in our Attack Engineering-focused SkillBridge program, please submit your resume for review. We’ll follow up to determine fit and next steps.
Top Skills
What We Do
Horizon3.ai's mission is to help you find and fix attack vectors before attackers can exploit them. NodeZero, our autonomous penetration testing solution, enables organizations to continuously assess the security posture of their enterprise, including external, identity, on-prem, IoT, and cloud attack surfaces. Like APTs, ransomware, and other threat actors, our algorithms discover and fingerprint your attack surface, identifying the ways exploitable vulnerabilities, misconfigurations, harvested credentials, and dangerous product defaults can be chained together to facilitate a compromise. NodeZero is a true self-service SaaS offering that is safe to run in production and requires no persistent or credentialed agents. You will see your enterprise through the eyes of the attacker, identify your ineffective security controls, and ensure your limited resources are spent fixing problems that can actually be exploited. Founded in 2019 by industry, US Special Operations, and US National Security veterans, Horizon3.ai is headquartered in San Francisco, CA, and made in the USA.
