Senior Security Engineer, PKI & Secrets

CoreWeave•San Francisco, NY

22h•Hybrid

About The Position

The Security Foundations organization at CoreWeave keeps CoreWeave Cloud secure by design, from data centers and GPU fleets to the platform layers powering our customers' AI workloads. The PKI & Secrets team owns the cryptographic infrastructure underpinning the confidentiality, integrity, and authenticity of CoreWeave's data and systems: PKI, secrets management, HSMs, key management, and code signing. We partner with teams across the company to deliver cryptographic services that are secure, reliable, and easy to use at scale. As a Senior Security Engineer on the PKI & Secrets team, you will shape how CoreWeave manages cryptographic infrastructure across its global fleet. You'll design and operate PKI hierarchies, secrets management platforms, HSM infrastructure, and key management systems; working hands-on with engineering teams to integrate these capabilities into their services and workflows.

Requirements

(5)+ years of experience in security engineering or infrastructure engineering.
Strong understanding of PKI concepts including CA hierarchies, certificate profiles, issuance policies, revocation, and trust distribution.
Hands-on experience operating HashiCorp Vault or similar secrets management platforms in production.
Experience with hardware security modules (HSMs), PKCS#11 interfaces, and key ceremony procedures.
Solid understanding of applied cryptography: symmetric and asymmetric algorithms, digital signatures, envelope encryption, and TLS.
Proficiency in Go, Python, or similar languages, with the ability to build production tooling and automation.
Experience with Kubernetes, including cert-manager, trust-manager, or External Secrets Operator.
Demonstrated ability to drive cross-functional initiatives across infrastructure, platform, and product teams.

Nice To Haves

Experience operating PKI backed by HSMs in a cloud provider or hyperscaler environment.
Familiarity with code signing workflows (Authenticode, Cosign/Sigstore, transparency logs, timestamping).
Experience with KMS design, including customer-managed keys and multi-tenant key isolation.
Understanding of hardware attestation and workload identity (TPM, SPDM, SPIFFE/SPIRE).
Exposure to post-quantum cryptography standards and migration planning.

Responsibilities

Contribute to the design, implementation, and operation of CoreWeave's PKI infrastructure, including CA hierarchies, issuance policies, certificate lifecycle management, and trust distribution across Kubernetes clusters and bare-metal hosts.
Manage and evolve secrets management platforms, including access policies, secret lifecycle governance, and integration patterns using External Secrets Operator and cert-manager.
Operate and scale HSM infrastructure, including PKCS#11 integration, key ceremony procedures, and high-availability designs backing our certificate authorities and signing services.
Contribute to the design of key management and data encryption solutions for internal and customer-facing use cases, including envelope encryption and KMS API design.
Deliver PKI-based solutions supporting workload identity, mutual TLS, and hardware attestation.
Maintain and extend code signing infrastructure for firmware images, UEFI binaries, container images, and application binaries.
Develop and enforce cryptographic best practices and policies, and contribute to post-quantum cryptography readiness.