[Hiring] Staff Defensive Security Software Engineer @Horizon3 AI

Role Description

We are looking for a Staff Security Researcher / Developer to join our Detection & Deception (DnD) Team to help build Horizon3’s deception capabilities. The team works across product, design, and engineering to deliver features such as Tripwires and Rapid Response.

This role will focus initially on evolving Tripwires — a threat detection and deception capability within the NodeZero platform that uses autonomous pentests to place decoys (honeytokens) along high-risk attack paths. When an attacker interacts with a tripwire, the system generates an alert so defenders can investigate and respond.

It's a great fit for someone who thrives in an agile, fast-paced environment and is excited to ship high-quality work that has a real impact on the cybersecurity landscape.

• Combine deep security domain expertise with hands-on full-stack development.
• Design, prototype, and ship new security capabilities within NodeZero.
• Partner with product managers and designers to identify high-impact opportunities.
• Work alongside product engineers to quickly turn ideas into MVPs and production features.
• Focus on honeytoken and honeypot creation, deployment, and detection logic for Tripwires and adjacent products.
• Deepen customer engagement with our platform and deliver novel solutions that improve their security posture.

Qualifications

• Expert-level proficiency in large-scale Python software development.
• Deep experience with network security topics such as reconnaissance and lateral movement.
• Proficiency with Active Directory, Windows authentication, and other Windows internals.
• Strong understanding of network protocols such as SMB and WMI.
• Experience with relational (Postgres) or graph (Neo4j) database systems.
• Minimum of 4 years of experience in building offensive or defensive security solutions.
• Bachelor's Degree in Computer Science, Computer Engineering or related field.

Requirements

• Owns the end-to-end technical vision for the workstream.
• Production code contributions at Lead/Staff level in a modern backend language (Go, Rust, Python, or similar).
• Ability to work independently with minimal supervision.
• Work closely with cross-functional partners to build and improve our product portfolio.
• Strong technical writing and documentation skills.
• Proficiency in designing, presenting, and evaluating technical solutions.
• Sets and raises the technical bar by example.
• Mentors and enhances the engineers around them.
• Translates ambiguous product goals into concrete technical roadmaps.

Benefits

• Inclusive Team: We value diversity and promote an inclusive culture.
• Growth Opportunities: Be part of a dynamic and growing team with numerous career development opportunities.
• Innovative Culture: Work in a collaborative environment that encourages creativity.
• Remote Work: Enjoy the flexibility to work in the way that supports you.
• Competitive Compensation: Includes health, vision & dental care, flexible vacation policy, and generous parental leave.