Horizon3.ai · 21 hours ago
Attack Engineer
United States
Full-time
Remote
Senior Level
$181K/yr - $242K/yr
7+ years expHorizon3.ai is a fast-growing, remote cybersecurity company dedicated to enabling organizations to proactively find, fix and verify exploitable attack vectors. The Attack Engineer will design and build production-grade systems for the NodeZero platform, focusing on researching and weaponizing vulnerabilities while leveraging AI technologies to automate attack workflows.
Artificial Intelligence (AI)Cyber SecurityEnterprise SoftwareMachine LearningNetwork Security
Responsibilities
Research and develop novel attack capabilities for integration into the NodeZero platform, focusing on autonomous red teaming, offensive security automation, and external perimeter breach techniques
Acquire, configure, and exploit vulnerable test environments to validate and demonstrate attack scenarios
Extend and maintain platform architecture and data models to support new research and product features
Monitor public vulnerability databases and threat intelligence sources to stay current on emerging threats
Collaborate cross-functionally with engineers, product managers, and customer teams to resolve issues, enhance features, and drive customer value
Mentor teammates and improve team processes, code quality, and research standards
Author technical blog posts and internal documentation showcasing new capabilities, research, and methodologies
Qualification
Required
7+ years of combined experience in software engineering and red teaming/ offensive security
Expert-level proficiency in Python for large-scale development
Proficient in object-oriented design, test-driven development, and scalable code design
Experience designing and integrating APIs, data structures, and full-stack system components
Experience developing in fast-paced, product-driven environments with distributed teams
Skilled with Git and modern team collaboration workflows (PRs, CI/CD, code reviews)
Familiar with containerization and orchestration tools such as Docker and Kubernetes
Comfortable working with relational (Postgres) and graph (Neo4j) databases
Hands-on experience with developing tools for offensive cybersecurity and/or red team operations
Deep understanding of common RCE techniques (e.g., SQL injection, buffer overflows, path traversal)
Familiar with exploitation of network protocols, web applications, and complex enterprise software
Ability to translate security research into functional, autonomous attacks within a product context
Experience attacking Windows environments (e.g., Active Directory), cloud platforms (AWS, Azure, GCP), and/or Kubernetes
Outstanding analytical and problem-solving aptitude, especially when dealing with unfamiliar systems
Self-motivated and energetic with the ability to operate independently with minimal supervision
Ability to manage multiple priorities and deliver on both short- and long-term objectives
Strong written and verbal communication skills; capable of creating technical documentation and explaining complex topics to a broad audience
Demonstrated curiosity and adaptability; quick to adopt new technologies and domains
Preferred
Bachelor's degree in Computer Science or a related field
OSCP (Offensive Security Certified Professional) or equivalent certifications
Demonstrated experience using AI or LLM-based tools to enhance or automate exploit development, vulnerability triage, or security research workflows
Contributions to open-source security tools, technical blog posts, or public vulnerability research
Prior development experience within large-scale or multi-tenant SaaS applications
Familiarity with Nuclei, Metasploit, BloodHound, and similar offensive tooling
Benefits
Health, vision & dental insurance for you and your family
Flexible vacation policy
Generous parental leave
Company
Horizon3.ai
Horizon3.ai offers an autonomous penetration testing platform that helps organizations proactively find and fix security vulnerabilities.
201-500 employees
Funding
Current Stage
Late StageTotal Funding
$178.5MKey Investors
Prosperity7 VenturesNew Enterprise AssociatesCraft Ventures
2026-01-13Series Unknown
2025-05-22Series D· $100M
2023-08-08Series C· $40M
Leadership Team
Snehal Antani
Co-Founder & CEO
Holly Grey
Chief Financial Officer
Recent News
2025-12-16
Company data provided by crunchbase