Senior Ip Core Network Engineer Jobs in Wisconsin

Cirrascale Cloud Services provides high-performance cloud infrastructure purpose-built for deep learning, generative AI, and large-scale AI inference workloads. We specialize in dedicated GPU cloud solutions tailored to the unique needs of startups, research labs, and enterprise AI teams. Our mission is to accelerate AI innovation by combining powerful hardware with white-glove service and flexible, custom-built environments.

We are seeking a Sr. Network Engineer to join our Engineering team. This individual contributor role operates with high autonomy, owning network projects from conception through delivery. The role owns the design, operation, and optimization of Cirrascale's SD-WAN, multi-homed internet edge, and cloud interconnect infrastructure, ensuring SLA-backed connectivity across data centers, cloud, and customer environments. You will work with the VP of Engineering to align network initiatives with infrastructure and platform strategy. You will partner cross-functionally to deliver secure, scalable, and high-performance network systems, including the InfiniBand fabrics that support our AI and HPC workloads.

• Own and operate the company’s internet edge architecture, including ASN management, upstream provider relationships, peering strategy, and global routing policy.
• Design, configure, and maintain SD-WAN, LAN, WAN, VPN, firewall, and switching/routing environments.
• Deploy and support InfiniBand fabrics for GPU cluster infrastructure.
• Implement network telemetry and BGP monitoring systems to proactively detect routing anomalies, traffic shifts, and DDoS conditions.
• Monitor network performance and troubleshoot issues to ensure reliability and uptime.
• Lead incident response for network edge events and author postmortems with actionable remediation plans.
• Support the buildout of new infrastructure within our GPU cloud platform.
• Collaborate with Engineering and Platform teams to align networking with infrastructure needs.
• Manage network documentation including topologies, IP allocations, and configurations.
• Evaluate and recommend new tools, technologies, and network optimizations.
• Assist in data center migrations and bringups, hardware upgrades, and capacity planning.
• Maintain compliance with internal and external security and performance standards.

• Designed, operated, and scaled resilient multi-homed internet edge architectures supporting >10Gbps sustained throughput, including routing policy design, peering strategy (IXPs), inbound/outbound traffic engineering, validated failover procedures to meet SLA-backed uptime targets, and advanced eBGP policy implementation (route filtering, community manipulation, local-pref/MED tuning, AS-path prepending).
• Built high-availability edge designs utilizing redundant firewalls (active/passive or active/active), state synchronization, load balancing, and fast failure detection mechanisms (e.g., BFD).
• Experience implementing DDoS mitigation strategies, RTBH, or integration with scrubbing providers is strongly preferred.
• Experience designing and operating hybrid cloud interconnects and customer connectivity solutions including private interconnects, cross-connects, and IPsec/GRE tunnels.
• 7+ years of experience in network engineering or related infrastructure roles.
• Strong knowledge of TCP/IP, BGP, OSPF, ECMP, VLANs, and other Layer 2/3 technologies.
• Hands-on experience with enterprise switches, routers, and firewalls (e.g., Cisco, Arista, SONiC, Fortinet).
• Experience with network monitoring tools (e.g., Nagios, Zabbix, Prometheus/Grafana, etc.).
• Demonstrated experience automating network configuration, validation, and change management using Ansible, Python, or similar tools in production environments.
• Understanding of cloud and virtualization concepts (OpenStack, VMware, k8s, etc.).
• Strong documentation and communication skills.
• Ability to participate in an on-call rotation and occasional after-hours support.

• Demonstrated technical leadership as a senior engineer, including setting technical standards and driving network design projects end-to-end.
• Certifications such as CCNA, CCNP, or equivalent experience.
• Exposure to HPC, data center networking, SD-WAN and InfiniBand.
• Experience in a fast-paced startup or cloud service provider environment.

The base salary range for the Sr. Network Engineer is $125,000 to $180,000. This pay range reflects the broad, minimum to maximum, pay range for this job for the location for which it has been posted. Compensation decisions are dependent on several factors including, but not limited to, an individual’s qualifications, location where the role is to be performed, internal equity, and alignment with market data.

Comprehensive benefits package, including health, dental, and vision insurance, retirement plans, paid time off, and opportunities for professional development.

Join a growing team that’s pushing the boundaries of AI infrastructure. At Cirrascale, you’ll contribute to projects powering next-generation AI applications while working with top-tier hardware in a collaborative and innovative environment. From custom deployments to hands-on customer support, every role here plays a part in enabling breakthroughs in AI.