Lead Security Engineer (AI) – Product Security

What you'll do

• Lead the security strategy for Nubank's AI systems and build standards for secure deployment.
• Secure AI agents by hardening tools, enforcing permissions, and monitoring behavior in production.
• Design secure architectural patterns for LLM-based services and agent orchestration systems.
• Develop detection and monitoring capabilities to identify abuse and anomalous behavior in AI systems.
• Implement runtime protections for LLM applications, including prompt injection detection and output safety controls.
• Collaborate with engineering teams to integrate security into AI development and deployment pipelines.

What we're looking for

• Deep expertise in product security, application security, and cloud security.
• Proven track record leading cross-team technical initiatives without direct authority.
• Hands-on experience designing and implementing secure systems in production environments.
• Experience with runtime security controls for high-throughput production systems.
• Solid familiarity with LLM application architectures and their threat surfaces.
• Strong understanding of agentic systems and AI infrastructure, including monitoring.
• Programming skills in at least one production language for reviewing code.