horizon3ai - Staff Attack Engineer, AI/LLM
Requirements
• Expert-level Python and software engineering skills. • Solid penetration testing fundamentals and understanding of common attack chains. • Familiarity with AI/LLM security frameworks (e.g., OWASP Top 10 for LLMs, MITRE ATLAS). • Experience in a security product or offensive security team, ideally with shipped offensive capabilities or tooling. • Proven ability to break AI/LLM and agentic systems. • Clear understanding of trust boundaries around AI tools, data sources, and permissions, and how to systematically test and exploit them. • Expert-level ownership – drives high-complexity, high-risk programs and sets strategy, not just execution. • Self-motivated – identifies problems and builds solutions proactively. • Industry obsessed – tracks the fast-moving AI security landscape and can speak to recent developments, new attacks, and where the field is heading. • Experience with other cloud AI services (e.g., Azure OpenAI, GCP Vertex AI). • Contributions to AI security research (blog posts, conference talks, CVEs, open-source tools). • Experience with AWS Bedrock and AWS Agent Core. • Familiarity with graph databases (e.g., Neo4j). • Background in traditional exploit development or vulnerability research. • CTF experience, particularly in AI/ML-focused challenge categories.
Responsibilities
• Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee. Duties, responsibilities, and activities may change at any time with or without notice.
Benefits
• Inclusive Team: We value diversity and promote an inclusive culture where everyone can thrive. • 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 and out-of-the-box thinking. • Remote Work: We are a 100% remote company. Enjoy the convenience and work-life balance that comes with remote work. • Competitive Compensation: We offer competitive salary, equity and benefits. Our benefits include health, vision & dental insurance for you and your family, a flexible vacation policy, and generous parental leave. • At Horizon3, we believe that our people are our greatest asset, and our compensation philosophy reflects this core value. We are committed to fostering an environment where all employees feel valued, respected, and rewarded for their contributions. Our compensation structure is designed to be fair, competitive, and transparent, ensuring that every team member is recognized and compensated equitably across roles, levels, and locations. • In accordance with various State’s transparency regulations, we provide the following salary range information for this position: • Base salary range: $223,000 - $275,000 annually. The exact salary will be determined based on the selected candidate’s location, qualifications, experience, and relevant skills. • Additional compensation: All full-time roles are eligible for an equity package in the form of stock options. • You Belong Here
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