Cryptography Engineer Cybersecurity Jobs

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Today

Staff + Software Security Engineer

Anthropic San Francisco, CA

San Francisco, CA

Today

$32k - $485k/yr Full time Application Security Cloud Platforms Container Security

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Job Description

This role focuses on designing, building, and operating security foundations used across Anthropic, from threat modeling through production deployment and organization-wide adoption. You will lead end-to-end security services that strengthen authentication, authorization, cryptography, and zero-trust access controls.

Key Responsibilities

Build security foundations including cryptographic frameworks, mTLS infrastructure, secure serialization, and authorization systems, with the goal of preventing entire classes of vulnerabilities.
Collaborate with product, research, infrastructure, and other security teams to ensure frameworks integrate effectively with lower-layer security controls.
Scope, design, and build security services and libraries end-to-end; maintain them in production; and drive resolution of ambiguous technical problems with minimal oversight.
Design and operate a zero-trust access gateway that fronts Anthropic internal services.
Develop and roll out authorization frameworks so services enforce least privilege consistently rather than implementing ad hoc access controls.
Own cryptographic frameworks and libraries used across teams.
Mentor engineers, contribute to hiring, and help grow security engineering culture across Anthropic.

Required Qualifications

8+ years of software engineering experience building security-relevant systems in production, including leading complex initiatives independently.
Strong programming skills in Go, Rust, or Python.
Deep understanding of authentication and authorization systems, including OAuth 2.0 / OIDC, JWTs, service-to-service authentication, and policy-based access control.
Hands-on experience with PKI, X.509, mTLS, and workload identity.
Working knowledge of applied cryptography, including selecting and composing primitives, key management, and common library failure modes.
Experience shipping and operating high-reliability services on Kubernetes across cloud and on-prem environments, including being on call.
Track record of bringing clarity and ownership to ambiguous technical problems and driving them to resolution across teams.
Strong developer experience orientation and clear communication across all levels of the organization.
Passion for AI safety and the role security engineering plays in building trustworthy AI systems.

Preferred Qualifications

Experience building security frameworks or libraries adopted across an engineering organization, including driving organizational adoption.
Experience building or operating a zero-trust / BeyondCorp-style access gateway or identity-aware proxy.
Experience migrating a fleet to mTLS at scale, including certificate issuance and staged enforcement.
Experience maintaining or contributing to open-source cryptographic libraries.
Experience designing authorization systems using policy languages or relationship-based models.
Familiarity with ML infrastructure, including training and inference serving.

Technical Focus

Go, Rust, Python, OAuth 2.0, OIDC, JWTs, PKI, X.509, mTLS, Kubernetes

Education and Logistics

Minimum education: Bachelor’s degree or an equivalent combination of education, training, and/or experience.
Field of study: A field relevant to the role as demonstrated through coursework, training, or professional experience.
Experience level: Years of experience required will correlate with internal job level requirements for the position.
Location: San Francisco, CA (hybrid). Staff are expected to be in one of the offices at least 25% of the time, though some roles may require more.
Visa sponsorship: Offered, with reasonable efforts made if an offer is extended. An immigration lawyer is retained to assist.

Compensation

Annual salary: $32,000 - $485,000 USD

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