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Horizon3.aiHO

Staff Attack Engineer, AI/LLM

We are a mix of US Special Operations, US National Security, and cybersecurity industry veterans.

Horizon3.ai

Employee count: 51-200

Salary: 223k-275k USD

United States only

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We are hiring a Staff Attack Engineer specializing in AI/LLM security to join our team. You will break AI and agentic systems and turn that research into automated attacks inside NodeZero, our autonomous pentesting platform.

Requirements

  • Attacking AI/LLM Systems
  • Design and execute prompt injection and defense evasion attacks, focusing on generalized, reusable patterns.
  • Conduct tool-use exploitation, abusing LLM agents’ access to code, file systems, APIs, and databases for attacker-realistic outcomes (e.g., context poisoning, RCE, data exfiltration, privilege escalation).
  • Target AI infrastructure (model serving, training pipelines, vector databases, GPU/MLOps tooling) with an understanding of real-world enterprise deployments and misconfigurations.
  • Research and apply model and supply chain attacks (poisoning, training data extraction, adversarial inputs, deployment pipeline abuse).
  • Perform threat modeling for agentic systems, mapping trust boundaries and attack surfaces and turning them into concrete attack paths.
  • Apply a strong productization mindset, turning manual techniques into safe, reliable, and scalable automated tooling.
  • Building with LLMs
  • Build and extend LLM-powered applications (prompting, structured output, agentic workflows).
  • Design with production concerns in mind: cost, safety and hallucination guardrails, reliability, and observability.
  • Design and extend microservices that orchestrate LLM tasks and integrate with NodeZero and related offensive workflows.

Benefits

  • Inclusive Team
  • Growth Opportunities
  • Innovative Culture
  • Remote Work
  • Competitive Compensation

About the job

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Posted on

Job type

Full Time

Experience level

Salary

Salary: 223k-275k USD

Location requirements

Hiring timezones

United States +/- 0 hours

About Horizon3.ai

Learn more about Horizon3.ai and their company culture.

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We are a mix of US Special Operations, US National Security, and cybersecurity industry veterans. Our mission is to “turn the map around” – using the attacker’s perspective to help enterprises prioritize defensive efforts. Our team of nation-state-level, ethical hackers continuously identifies new attack vectors through autonomous pentesting and red team operations, leveraging collective intelligence to improve our products and strengthen our clients’ security. Founded in 2019, Horizon3.ai is headquartered in San Francisco, CA, and 100% made in the USA.

Employee benefits

Learn about the employee benefits and perks provided at Horizon3.ai.

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Retirement benefits

Generous 401(k) retirement plan to help you invest in your future.

Healthcare benefits

Medical, dental, and vision insurance for employees and dependents.

Equity benefits

Every employee gets equity, so you are rewarded for your best work.

Company events

Opportunities to travel to company on-sites, partner events, and conferences

View Horizon3.ai's employee benefits
Horizon3.ai logoHO

Horizon3.ai

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