Senior Security Engineer, PKI & Secrets

What You'll Do:

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.

About the Role:

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.

In this role, you will:

• 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.

Who You Are:

• (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.

Preferred

• 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.

Wondering if you're a good fit?

We believe in investing in our people, and value candidates who can bring their own diversified experiences to our teams, even if you aren't a 100% skill or experience match. If some of this describes you, we'd love to talk.

• You think deeply about how trust is established in complex distributed systems — and you enjoy making that infrastructure invisible to the teams that depend on it.
• You're comfortable operating at multiple levels of abstraction, from HSM key ceremonies to Kubernetes operator design and developer experience.
• You're a pragmatic builder who ships durable solutions in fast-moving environments.

Why CoreWeave?

At CoreWeave, we work hard, have fun, and move fast!  We’re in an exciting stage of hyper-growth that you will not want to miss out on. We’re not afraid of a little chaos, and we’re constantly learning. Our team cares deeply about how we build our product and how we work together, which is represented through our core values: 

• Be Curious at Your Core
• Act Like an Owner
• Empower Employees
• Deliver Best-in-Class Client Experiences
• Achieve More Together

We support and encourage an entrepreneurial outlook and independent thinking. We foster an environment that encourages collaboration and enables the development of innovative solutions to complex problems. As we get set for takeoff, the organization's growth opportunities are constantly expanding. You will be surrounded by some of the best talent in the industry, who will want to learn from you, too. Come join us!

The base salary range for this role is $165,000 to $242,000. The starting salary will be determined based on job-related knowledge, skills, experience, and market location. We strive for both market alignment and internal equity when determining compensation. In addition to base salary, our total rewards package includes a discretionary bonus, equity awards, and a comprehensive benefits program (all based on eligibility).