Senior Network Engineer
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: - Benefits and Perks We offer a comprehensive and competitive benefits package designed to support our employees’ health, well-being, and long-term success. Benefits may vary by location, team, and role. Benefits include: 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 At Lightning AI, we are committed to fostering an inclusive and diverse workplace. We believe that diverse teams drive innovation and create better products. We provide equal employment opportunities to all employees and applicants without regard to race, color, religion, gender, sexual orientation, gender identity, national origin, age, disability, veteran status, or any other protected characteristic. We are dedicated to building a culture where everyone can thrive and contribute to their fullest potential. 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: $150,000—$190,000 USD Benefits and Perks We offer a comprehensive and competitive benefits package designed to support our employees’ health, well-being, and long-term success. Benefits may vary by location, team, and role. Benefits include: 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 At Lightning AI, we are committed to fostering an inclusive and diverse workplace. We believe that diverse teams drive innovation and create better products. We provide equal employment opportunities to all employees and applicants without regard to race, color, religion, gender, sexual orientation, gender identity, national origin, age, disability, veteran status, or any other protected characteristic. We are dedicated to building a culture where everyone can thrive and contribute to their fullest potential. Apply To This Job