Senior AI Security Engineer

📋 Description

• • As a Senior AI Security Engineer at Menlo Security, you will play a critical role in safeguarding the next generation of autonomous AI agents by researching and defending against emerging threats such as prompt poisoning, context manipulation, and adversarial behaviors in LLM-powered systems. Your work will directly contribute to securing AI agents that interact with untrusted web content, ensuring safe and reliable operation in high-stakes environments including Fortune 500 enterprises, global banks, and government institutions.
• • You will research emerging agentic threats including prompt injection, context poisoning, adversarial content embedding, and misuse of agent planning and reasoning mechanisms; architect scalable, high-performance pipelines to secure agent-to-web interactions; develop and prototype novel detection and mitigation techniques for malicious prompts and unsafe contextual signals; implement these as security controls within agentic runtimes; collaborate with applied engineers to integrate research-driven security mechanisms into production systems while balancing security and performance; continuously model and anticipate evolving AI threats as agent autonomy increases; and build defensive mechanisms within the browser surrogate to detect and neutralize complex context poisoning and injection attempts embedded in web content.
• • Menlo Security is a well-funded, mission-driven cybersecurity company backed by top-tier investors including Vista Equity Partners, General Catalyst, JPMC, American Express, HSBC, and Ericsson Ventures. We protect some of the world’s most sensitive organizations by enabling secure connection, communication, and collaboration without compromise. Our culture is built on five core values: Stay Aligned, Get It Done, Customer Empathy, Think Creatively, and Help Each Other Out — fostering a collaborative, inclusive, and innovative environment where initiative and new ideas are encouraged.
• • In this role, you will deepen your expertise at the intersection of AI security, agentic systems, and cloud-native engineering; gain hands-on experience shaping the future of AI safety in real-world deployments; contribute to open and impactful research with practical security outcomes; and grow as a technical leader in a high-growth, purpose-driven organization where your work directly protects critical digital infrastructure.