Security Foundations Engineer - Zero-Trust & Cryptography

Anthropic Limited; Seattle (WA); Hybrid; USD 320,000 - 485,000; Full time

Job summary

Anthropic is seeking a senior security engineer to design, build, and operate security foundations across our fleet, from threat modeling to production. The role offers opportunities to shape architecture in a fast-growing environment and work on cryptographic frameworks, mTLS, and authorization systems that prevent vulnerabilities.

You will partner with product, research, infrastructure, and security teams to integrate frameworks with lower-layer controls, scale security services, and mentor

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: choosing and composing primitives correctly, key management, and the ways libraries fail in practice.
• Experience shipping and operating high-reliability services on Kubernetes across cloud and on-prem environments.
• A track record of bringing clarity and ownership to ambiguous technical problems and driving them to resolution across teams.
• A strong sense of developer experience
• Clear communication across all levels of the organization
• Passion for AI safety and the role security engineering plays in building trustworthy AI systems

Responsibilities

• Build cryptographic frameworks, mTLS infrastructure, secure serialization, and authorization systems to prevent vulnerabilities.
• Partner with product, research, infrastructure, and security teams to ensure frameworks integrate with lower-layer security controls.
• Scope, design and build security services end-to-end, maintain them in production, and drive through ambiguous technical problems with minimal oversight.
• Build and operate the zero-trust access gateway that fronts Anthropic's internal services.
• Design and roll out authorization frameworks so services enforce least privilege.
• Own cryptographic frameworks and libraries.
• Mentor engineers, contribute to hiring, and grow security engineering culture across Anthropic.

Skills

Go

Rust

Python

OAuth 2.0 / OIDC

JWTs

PKI

mTLS

Kubernetes

Workload identity

Security ownership

Education

Bachelor's degree

Tools

Kubernetes

OpenSSL

Job description

Anthropic is seeking a senior security engineer to design, build, and operate security foundations across our fleet, from threat modeling to production. The role offers opportunities to shape architecture in a fast-growing environment and work on cryptographic frameworks, mTLS, and authorization systems that prevent vulnerabilities.

You will partner with product, research, infrastructure, and security teams to integrate frameworks with lower-layer controls, scale security services, and mentor