Security Engineer, Applied AI

Meta is seeking Security Engineers to join our Applied Artificial Intelligence (AAI) organization. As a Security Engineer in AAI, you will apply deep domain expertise to solve hard, real-world security problems — building novel security capabilities, prototyping AI-powered defenses, and advancing the frontier of what AI systems can do in security. Your work is AI-augmented from day one: you leverage AI tools and agents to accelerate your impact, and where the models fall short, your expertise directly drives their improvement.

You will blend hands-on security engineering with applied research — designing and executing novel approaches to security challenges that push both the state of Meta's security posture and the state of the art in AI-driven security. This includes building security products and tools, conducting original adversary research, developing detection and response capabilities, and translating security expertise into scalable, AI-native systems. Your domain knowledge — whether in detection engineering, threat intelligence, cloud security, adversary simulation, forensic investigation, or emerging areas — becomes the foundation for capabilities no existing AI system can replicate.

This role is for security practitioners who want to operate at the intersection of deep security expertise and frontier AI — not just using AI as a tool, but shaping what it is capable of.

Apply deep security domain expertise to identify, scope, and solve complex security problems that require multi-step reasoning, novel approaches, and expert judgment

Build security products, tools, and capabilities — prototyping AI-driven solutions to real-world security challenges at Meta's scale

Design and execute adversary research, threat analysis, detection engineering, or investigation workflows augmented by AI tools and agents

Identify where AI models lack security reasoning capability and directly contribute to improving them through expert-generated signal, evaluation, and feedback

Develop novel methodologies and reusable approaches that advance both Meta's security posture and AI system performance in security domains

Collaborate with model researchers to translate security expertise into training signal — decomposing hard problems into structured challenges that teach models to reason like security experts

Partner cross-functionally with engineering, product, and research teams to incorporate security innovations into production AI systems

Drive end-to-end execution of complex security initiatives with increasing independence, contributing to technical direction within the team

Disseminate findings through internal publications, knowledge sharing, and contributions to the broader security community

B.S. or M.S. in Computer Science, Cybersecurity, or related field, or equivalent experience. OR PhD + 2 years of hands-on security engineering experience

5+ years of hands-on security engineering experience in one or more domains: detection engineering, threat intelligence, incident response, cloud security, adversary simulation, offensive security, or digital forensics

Extensive knowledge of attacker tactics, techniques, and procedures

Proficiency in coding with experience in languages such as Python, Go, C/C++, or shell scripting

Experience building security systems, tools, or capabilities — not just identifying problems but engineering solutions

Demonstrated ability to operate independently on complex, ambiguous security challenges Demonstrated ability to integrate AI tools to optimize/redesign workflows and drive measurable impact (e.g., efficiency gains, quality improvements)

Experience adhering to and implementing responsible, ethical AI practices (e.g., risk assessment, bias mitigation, quality and accuracy reviews)

Demonstrated ongoing AI skill development (e.g., prompt/context engineering, agent orchestration) and staying current with emerging AI technologies

Experience leveraging AI tools (LLMs, agents, orchestration systems) to accelerate security workflows and enhance operational capability

Contributions to the security community (original research, tools, CTF design, conference presentations, publications)

Experience creating structured methodologies that scale security expertise across teams

Experience planning and executing adversary simulation campaigns or purple team exercises at scale

Experience with cloud security operations (AWS/GCP/Azure), cloud detection and response, or cloud-native defense

Experience with forensic investigation — reconstructing attack timelines from evidence across multiple sources

Background in supply chain security, mobile platform security, network protocol security, or AI/agent security

Experience improving AI model performance through expert feedback, red-teaming, or evaluation design