Staff Security Engineer, Network Security

We are seeking a Staff Network Security Engineer to architect the defense of our global backbone, edge, and massive-scale GPU clusters. We are looking for a builder, not an administrator. You will move beyond "configuring firewalls" to engineering security into the network fabric itself—utilizing telemetry, automation, and deep protocol

On this team, you will:

• Unravel and tackle network security challenges at an exhilarating global scale.
• Collaborate with exceptional network architects and engineers building the backbone infrastructure for the AI revolution.
• Enjoy the freedom and support to experiment, innovate, and significantly shape our approach to securing the underlay and overlay of our cloud.

In this role, you will:

• Conducting architecture reviews, protocol analysis, and design assessments to proactively identify and fix vulnerabilities in our backbone and data center fabrics.
• Developing robust, repeatable frameworks for network security automation (CoPP, ACL generation, Route Filtering) that make it easy for teams to build securely from day one.
• Collaborating closely with Network Engineering teams to integrate security checks and validation seamlessly into their CI/CD and config-push pipelines.
• Crafting clear, practical security guidance and documentation that empowers engineers to deploy secure routing policies and topologies.
• Actively participating in architectural discussions regarding peering, transit, and traffic engineering, providing insightful security recommendations.
• Occasionally, 'drawing the owl' - figuring out innovative solutions for securing massive throughput environments while navigating ambiguous situations.

• 7+ years of experience directly focused on Network Engineering, Infrastructure Security, or ISP/Backbone operations.
• Strong skills in core network protocols (BGP, OSPF/IS-IS, TCP/IP) and deep knowledge of how they function at the packet level.
• Solid experience developing network automation or security tooling in Go, Python, or similar modern languages.
• Proven experience collaborating with network architects to implement secure designs in multi-vendor environments (Arista EOS, SONiC, Juniper, etc.).
• Excellent ability to negotiate and reach consensus with engineers and fellow security practitioners, as well as excellent technical documentation skills.
• Familiarity with Linux networking internals, control plane protection, and managing infrastructure as code.

Preferred:

• Hands-on experience with hyperscale network architectures (CLOS fabrics, MPLS/EVPN, VXLAN) and the unique security challenges of high-performance computing.
• Familiarity with hardware-level networking security (SmartNICs/DPUs, connectX) and flow-based telemetry analysis.
• Deep understanding of internet routing security standards (RPKI, MANRS) and advanced DDoS mitigation strategies at the network layer.
• Hands-on experience with Infiniband and RoCE

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 provides the opportunity to develop innovative solutions to complex problems. As we get set for take off, the growth opportunities within the organization 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 $188,000 to $275,000. 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).