Senior Engineer, Cilium CNI & Cloud Networking
About The Position
As a Senior Engineer focused on our Cilium-based CNI, you will design, build, and operate the container networking layer that underpins CoreWeave’s Kubernetes platforms. Day to day, you will work on evolving our CNI stack to support large, high-density GPU clusters with demanding throughput and latency requirements. You will partner closely with Kubernetes, Infrastructure, and Network Services engineers to ensure the platform is highly available, observable, and secure. This role spans architecture, implementation, and operations, with ownership from prototype through production. You will also help shape how our networking platform scales for future growth.
Requirements
- 5+ years of experience as a Software, Systems, or Network Engineer working on cloud infrastructure or large-scale distributed systems.
- Hands-on production experience with Cilium CNI (or equivalent advanced CNIs), including cluster configuration and lifecycle management.
- Strong understanding of Cilium’s eBPF datapath, policy model, and load-balancing mechanisms.
- Deep knowledge of cloud networking concepts, including VPCs, subnets, routing, security groups/ACLs, NAT, and ingress/egress architectures.
- Experience designing multi-tenant network architectures with strong isolation and security.
- Solid grounding in TCP/IP, dynamic routing (e.g., BGP), ECMP, MTU/fragmentation, and overlay/underlay networking (VXLAN, Geneve, encapsulation).
- Experience with network observability and troubleshooting across L3–L7.
- Proficiency in at least one systems language such as Golang, Python, or C/C++.
- Experience working in modern CI/CD environments.
- Experience operating Kubernetes at scale, including cluster lifecycle management and debugging networking issues across pods, nodes, and external services.
- Demonstrated ownership of complex systems end-to-end.
Nice To Haves
- Experience operating cloud-scale network services across tens of thousands of nodes and multiple regions.
- Contributions to Cilium, Kubernetes, or related open-source networking projects.
- Experience with eBPF development and performance tuning.
- Experience building Kubernetes operators or controllers.
- Familiarity with service meshes, multi-cluster networking, or cluster mesh solutions.
- Experience in GPU-heavy, HPC, or other performance-sensitive environments.
Benefits
- Medical, dental, and vision insurance - 100% paid for by CoreWeave
- 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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What This Job Offers
Job Type
Full-time
Career Level
Mid Level
Education Level
No Education Listed
