Security Engineer​/Research Engineer, RL Security

Anthropic’s mission is to create reliable, interpretable, and steerable AI systems. We want AI to be safe and beneficial for our users and for society as a whole. Our team is a quickly growing group of committed researchers, engineers, policy experts, and business leaders working together to build beneficial AI systems.

Reinforcement learning is how Claude learns to reason, write code, and act autonomously over long horizons. At frontier scale, an RL run is a large distributed system: training, sampling, and environment execution run concurrently across a large fleet of accelerators and hosts. As an engineer in RL Engineering, you'll work on keeping that system secure as it scales.

This is a hands‑on engineering role. You'll work in the RL codebase and the infrastructure underneath it, alongside the engineers and researchers who build and use it. The system is large and changes as fast as the research does, so security work here has to keep up with that pace without costing performance or velocity.

We're hiring from two backgrounds: security engineers who want to work on large‑scale ML systems, and ML systems or research engineers who want to work on security. Strong candidates have depth in one and real interest in the other.

• Design, build, and operate security controls for RL training systems and the infrastructure they run on
• Work across the stack (orchestration, environments, training, inference) wherever the work is needed
• Review designs and code across the RL stack, find security problems, and fix them
• Build shared libraries and tooling that other RL engineers and researchers build on
• Build the observability needed to understand what these systems are doing
• Work with researchers and performance engineers to make sure security changes preserve training correctness and performance
• Write clear design documents for what you build

• 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

• Experience running ML training or inference infrastructure at scale
• Experience with infrastructure security, such as isolation, access control, networking, or identity
• Experience with container orchestration such as Kubernetes, and with sandboxed or virtualized code execution at scale
• Experience building observability for large fleets
• Experience supporting research teams or other fast‑moving internal users
• Familiarity with reinforcement learning or large language model training workloads

The annual compensation range for this role is listed below.

For sales roles, the range provided is the role’s On Target Earnings ("OTE") range, meaning that the range includes both the sales commissions/sales bonuses target and annual base salary for the role.

Annual Salary:$320,000—$405,000 USD

Minimum education: Bachelor’s degree or an equivalent combination of education, training, and/or experience

Required field of study:A field relevant to the role as demonstrated through coursework, training, or professional experience

Minimum years of experience: Years of experience required will correlate with the internal job level requirements for the position

Location-based hybrid policy: Currently, we expect all staff to be in one of our offices at least 25% of the time.…