Principal Attack Engineer, AI/LLM

🔥 12 hours ago

🇺🇸 United States – Remote

💵 $238k - $280k / year

⏰ Full Time

🔴 Lead

🤖 AI Engineer

👻 Ghost score 20%

What it means: the chance that no one is really hiring for this job.How to read it: 60% or higher means we think this is a ghost. Lower scores are less of a worry.How we score it: age, reposts, open roles vs team size, how fast jobs close, and whether pay is listed.Fine print: an estimate from public data, not a judgment of the company. Real jobs can score high, so treat it as a hint, not a fact.

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Horizon3.ai

WebsiteLinkedInAll Job Openings

51 - 200 employees

Founded 2019

🔒 Cybersecurity

🤖 Artificial Intelligence

☁️ SaaS

Cybersecurity • Artificial Intelligence • SaaS

Horizon3. ai is a cybersecurity company that specializes in autonomous penetration testing through its platform, NodeZero. The company's mission is to proactively identify and address attack vectors before they can be exploited, allowing organizations to continuously assess their security posture across various environments including cloud, IoT, and on-premises systems. Founded by veterans from the US Special Operations and National Security sectors, Horizon3. ai offers a self-service SaaS solution that provides organizations with insights into their security vulnerabilities without requiring persistent or credentialed agents.

📋 Description

• Define the long-term technical vision for AI/LLM offense and its role in NodeZero and Horizon3’s product strategy • Partner with senior engineering, product, and business leadership on priorities, investments, risk posture, and roadmap • Set direction for complex, high-risk, business-critical AI/LLM programs • Lead cross-company initiatives across Attack Engineering, Platform, Product, customer-facing teams, and other technical functions • Diagnose systemic blockers and drive durable resolution • Define standards for reliability, safety, observability, evaluation, testing, cost management, and operational readiness • Develop P5 engineers and senior technical leaders • Own NodeZero’s OWASP Top 10 for LLM Applications coverage strategy and extend it to multi-agent and tool-connected systems • Set the research and productization agenda for breaking AI and agentic systems • Identify novel attack classes and establish repeatable frameworks and coverage models • Direct approaches to prompt injection, defense evasion, tool-use exploitation, context poisoning, remote code execution, data exfiltration, and privilege escalation • Set direction for assessing AI infrastructure, model serving, training pipelines, vector databases, GPU/MLOps tooling, and enterprise deployments • Establish threat modeling for agentic systems • Turn research into safe, reliable, scalable NodeZero product capabilities • Set architecture for LLM-powered offensive applications, agentic workflows, evaluation systems, and NodeZero integration • Guide microservices and shared platforms orchestrating LLM tasks • Lead architectural transformations and ensure sustainable operation through ownership, incident learning, and measurable quality standards • Represent Horizon3 through technical writing, talks, research, or open-source contributions where appropriate • Travel up to 10% as required

🎯 Requirements

• Exceptional Python and software engineering expertise • Deep experience designing secure, reliable, observable, and operable systems at scale • Deep expertise in offensive security, penetration testing, exploit development, vulnerability research, or a closely related discipline • Recognized expertise in AI/LLM and agentic-system security • Deep command of the OWASP Top 10 for LLM Applications and MITRE ATLAS • Track record of shipping or shaping high-impact security capabilities, platforms, research programs, or technical standards across multiple teams • Ability to define long-term technical vision, resolve ambiguous problems, and drive execution through influence • Company-wide technical judgment across product value, safety, reliability, cost, speed, and maintainability • Ability to develop senior technical talent and multiply mentorship capacity • Experience setting technical direction or architecture across an engineering organization or multiple product areas • Industry-level contributions to AI security research through publications, conference talks, CVEs, open-source projects, or widely adopted techniques • Experience shaping strategy for AWS Bedrock, AWS Agent Core, Azure OpenAI, or Google Vertex AI • Experience with agentic architectures, tool-use security, retrieval systems, vector databases, graph databases such as Neo4j, or AI infrastructure security • Background in traditional exploit development, vulnerability research, or building offensive security platforms at significant scale • CTF experience, particularly in AI/ML-focused challenge categories • Legally authorized to work in the United States

🏖️ Benefits

• All full-time roles are eligible for an equity package in the form of stock options • Career development opportunities • Collaborative environment that encourages creativity and out-of-the-box thinking • Health, vision & dental insurance for you and your family • Flexible vacation policy • Generous parental leave • Inclusive culture • Fully remote work model • Up to 10% travel

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