Security Engineer, Network Security

What You’ll Do:

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:

• Conduct architecture reviews, protocol analysis, and design assessments to proactively identify and fix vulnerabilities in our backbone and data center fabrics.
• Develop robust, repeatable frameworks for network security automation (CoPP, ACL generation, Route Filtering) that make it easy for teams to build securely from day one.
• Collaborate closely with Network Engineering teams to integrate security checks and validation seamlessly into their CI/CD and config‑push pipelines.
• Craft clear, practical security guidance and documentation that empowers engineers to deploy secure routing policies and topologies.
• Actively participate 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.
• Bachelor’s degree in Computer Science or related field.
• 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.

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. In addition to base salary, our total rewards package includes a discretionary bonus, equity awards, and a comprehensive benefits program (all based on eligibility).

In addition to a competitive salary, we offer a variety of benefits to support your needs. These include:

• Medical, dental, and vision insurance—100% paid for by Core Weave.
• Company‑paid Life Insurance.
• Voluntary supplemental life insurance.
• Short and long‑term disability insurance.
• Flexible Spending Account.
• Health Savings Account.
• Tuition Reimbursement.
• Ability to participate in Employee Stock Purchase Program (ESPP).
• Mental Wellness Benefits through Spring Health.
• Family‑forming support provided by Carrot.
• Paid Parental Leave.
• Flexible, full‑service childcare support with Kinside.
• 401(k) with a generous employer match.
• Flexible PTO.
• Catered lunch each day in our office and data center locations.
• A casual work environment.
• A work culture focused on innovative disruption.

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