Staff Security Frameworks Engineer – Zero-Trust & PKI

Anthropic; San Francisco (CA); Hybrid; USD 120,000 - 485,000; Full time

Benefits offered by this job

Generous vacation

Equity donation matching

Flexible working hours

Office space in San Francisco

Job summary

Anthropic, based in San Francisco, seeks an experienced Security Engineer to design, build, and run security foundations used across Anthropic's fleet. You will shape architecture, implement cryptographic frameworks, and lead zero-trust access initiatives while mentoring engineers and collaborating across product, research, and infrastructure teams.

You will focus on authentication/authorization systems, PKI/mTLS, and high-reliability services on Kubernetes, contributing to a culture of

Qualifications

• 8+ years of software engineering experience building security-relevant systems in production.
• Strong programming skills in Go, Rust or Python.
• Deep understanding of authentication and authorization systems: OAuth 2.0 / OIDC, JWTs, service-to-service auth, policy-based access control.
• Hands-on experience with PKI, X.509, mTLS and workload identity.
• Working knowledge of applied cryptography: primitives, key management, library failures.
• Experience shipping and operating high-reliability services on Kubernetes across cloud and on-prem environments, including on-call.
• Track record of bringing clarity and ownership to ambiguous technical problems across teams.
• Strong sense of developer experience and clear communication across all levels.
• Passion for AI safety and security engineering's role in trustworthy AI systems.

Responsibilities

• Build security foundations including cryptographic frameworks, mTLS, secure serialization, and authorization systems.
• Partner with product, research, infrastructure, and security teams to ensure frameworks integrate smoothly with lower-layer security controls.
• Scope, design and build security services end-to-end, production-ready and maintainable.
• Build and operate the zero-trust access gateway that fronts Anthropic's internal services.
• Design and roll out authorization frameworks to enforce least privilege across services.
• Own cryptographic frameworks and libraries.
• Mentor engineers, contribute to hiring, and grow security engineering culture.

Skills

Go

Rust

Python

OAuth 2.0/OIDC

JWTs

mTLS

PKI

Kubernetes

On-call

Developer experience

Communication

AI safety

Education

Bachelor's degree

Tools

Kubernetes

Cryptographic libraries

Job description

Anthropic, based in San Francisco, seeks an experienced Security Engineer to design, build, and run security foundations used across Anthropic's fleet. You will shape architecture, implement cryptographic frameworks, and lead zero-trust access initiatives while mentoring engineers and collaborating across product, research, and infrastructure teams.

You will focus on authentication/authorization systems, PKI/mTLS, and high-reliability services on Kubernetes, contributing to a culture of