Lead Security Engineer (AI)

TL;DR

Lead Security Engineer (AI): Developing and driving defensive security strategies for AI systems, including LLM applications and autonomous agents, with an accent on runtime protection and threat modeling. Focus on building secure architectural patterns, designing detection systems for prompt injections, and enabling engineering teams to ship AI securely at scale.

Location: Must be based in or be able to relocate to Durham, Miami, Palo Alto, or Washington DC

Company

One of the world's largest digital financial platforms, redefining banking across Latin America through proprietary technology and data intelligence.

What you will do

• Define security frameworks and defensive strategies for LLM-powered applications and AI agents.
• Design secure architectural patterns for agent orchestration and LLM services.
• Implement runtime protections against prompt injection, jailbreaks, and data exfiltration.
• Develop monitoring and telemetry capabilities to identify abuse and anomalous behavior in production.
• Collaborate with AI engineers to integrate security controls into development and deployment pipelines.
• Set technical direction for AI security and guide engineering teams in secure deployment.

Requirements

• Must be authorized to work in the United States
• Deep expertise in product, application, or cloud security.
• Hands-on experience building AI agent systems and managing AI threat surfaces.
• Familiarity with LLM architectures like prompt pipelines, RAG, and agentic workflows.
• Experience implementing runtime security controls in high-throughput systems.
• Strong programming skills in at least one production language for code review and tool development.

Nice to have

• Proven track record of leading cross-team technical initiatives.
• Experience with threat modeling for non-deterministic AI systems.

Culture & Benefits

• Equity earning opportunity at Nu.
• Comprehensive health benefits including medical, dental, and vision insurance.
• 401(k) and financial saving plans (HSA/FSA).
• Hybrid work model with office attendance 2–3 times per week.
• Support for mental health, learning, and professional development.
• Relocation assistance package available.