Security Engineer / Research Engineer, RL Security

Highlights

• Secure frontier RL systems behind Claude's reasoning, coding, and autonomy.
• Build security controls across training, inference, and environment execution.
• Keep fast-moving RL infrastructure secure without costing performance or velocity.

What they offer

• Optional equity donation matching
• Generous vacation and parental leave
• Flexible working hours
• Lovely office space for collaboration

Ideal candidate

A security-minded systems builder or ML infrastructure engineer who thrives in fast-moving research environments and cares about securing frontier AI without slowing progress.

Requirements

• Strong software engineering skills in Python and at least one systems language such as Rust, C++, or Go
• Experience designing, building, and operating large-scale distributed systems or security systems in production
• Strong understanding of security fundamentals
• Working knowledge of Linux, containers, and cloud infrastructure
• Experience debugging complex problems across many hosts and services
• Ability to reason about tradeoffs between security, performance, and reliability
• Strong written communication, including design documents