Who We Are

Lightning AI is the company behind PyTorch Lightning. Founded in 2019, we build an end-to-end platform for developing, training, and deploying AI systems—designed to take ideas from research to production with less friction.

Through our merger with Voltage Park, a neocloud and AI Factory, Lightning AI combines developer-first software with cost-efficient, large-scale compute. Teams get the tools they need for experimentation, training, and production inference, with security, observability, and control built in.

We serve solo researchers, startups, and large enterprises. Lightning AI operates globally with offices in New York City, San Francisco, Seattle, and London, and is backed by Coatue, Index Ventures, Bain Capital Ventures, and Firstminute.

What We’re Looking For

Lightning AI is seeking a Senior Network Engineer with hands-on Cumulus Linux expertise to build and scale the network backbone behind our AI infrastructure platform. You’ll play a critical role in designing highly reliable, automated data center networks that support some of the most demanding AI workloads in the world.

What You'll Do

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 (IaC) solutions for network provisioning and operations
Troubleshoot complex network, performance, and congestion issues across distributed environments
Improve network observability, telemetry, and operational visibility
You have hands-on experience working with SONiC and Junos.
Experience with cloud networking technologies including VPC’s, NFV, Direct Connect, Cloud Connect
You enjoy working with a small group of friendly, highly motivated, high-execution colleagues
You’re comfortable with a high degree of autonomy, can independently prioritize your work and understand how it maps to the overall needs and goals of the company
You’re knowledgeable in your domain but also enjoy wearing multiple hats and venturing outside of your comfort zone when the need arises
You value the ability to write well and understand the importance of good documentation

What You’ll Need

Required Qualifications

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 with (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

Ideal Experience

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

This role is fully remote out of the continental U.S. with occasional team and company offsites. We are not able to provide visa sponsorship for this role at this time.

We are committed to offering competitive compensation that reflects the value each team member brings to our mission. Final offers are based on factors such as experience, skills, geographic location, and role expectations. In addition to base salary, our total rewards package for eligible roles includes a discretionary bonus, a meaningful equity component, and comprehensive benefits.

The anticipated annual base salary range for this role is:

Senior Network Engineer at Lightning AI