Senior Network Engineer

Stack

Responsibilities

• ▹Design and deploy scalable spine/leaf network architectures for AI data centers
• ▹Engineer high-performance Ethernet fabrics supporting GPU clusters and AI workloads
• ▹Build and maintain EVPN/VXLAN, BGP and high-speed routing environments
• ▹Optimize east-west traffic flows for AI training and inference operations
• ▹Support RoCE/RDMA networking and low-latency transport technologies
• ▹Support backbone, DCI, WAN and edge connectivity solutions
• ▹Collaborate with compute, storage, AI platform and operations teams to deliver integrated infrastructure solutions
• ▹Develop automation and Infrastructure-as-Code solutions for network provisioning and operations
• ▹Troubleshoot complex network, performance and congestion issues across distributed environments
• ▹Improve network observability, telemetry and operational visibility

Requirements

• ▹Experience with Cumulus NOS
• ▹5+ years of experience in large-scale data center networking
• ▹Experience in spine-leaf architectures and L3 fabrics
• ▹Experience with BGP, EVPN, VXLAN
• ▹Experience operating high-performance computing (HPC) or GPU-dense environments
• ▹Experience designing networks for hyperscalers, neoclouds or high-scale SaaS infrastructure
• ▹Experience in automation (Python, Ansible, Terraform or similar)
• ▹Experience with network observability tooling and telemetry pipelines
• ▹Proven ability to design systems that scale to thousands of nodes
• ▹Strong documentation and communication skills
• ▹Hands-on experience with SONiC and Junos
• ▹Experience with cloud networking technologies including VPCs, NFV, Direct Connect, Cloud Connect
• ▹Remote work from the continental U.S.; visa sponsorship is not available

Nice to have

• ▹Familiarity with NVIDIA networking (Spectrum, Quantum, BlueField, etc.)
• ▹Familiarity with RDMA, RoCE or InfiniBand fabrics
• ▹Experience with multi-region backbone design
• ▹Exposure to bare-metal provisioning systems
• ▹Experience working in high-growth infrastructure startups

Soft skills

What we offer

• ▹Annual base salary: USD 150,000-190,000
• ▹Discretionary bonus and a meaningful equity component
• ▹Comprehensive medical, dental and vision coverage (U.S.); private medical and dental insurance (U.K.)
• ▹Retirement and financial wellness support (U.S.); pension contribution (U.K.)
• ▹Generous paid time off, plus holidays
• ▹Paid parental leave
• ▹Professional development support
• ▹Wellness and work-from-home stipends
• ▹Flexible work environment

About the company

Lightning AI is the company behind PyTorch Lightning, founded in 2019. It builds an end-to-end platform for developing, training and deploying AI systems. Through its merger with Voltage Park it combines developer-first software with cost-efficient, large-scale compute. It has offices in New York City, San Francisco, Seattle and London.