Network Engineer (AI Infrastructure)

TL;DR

Network Engineer (AI Infrastructure): Designing, deploying, and operating high-speed network infrastructure for GPU AI factories across Europe with an accent on RDMA fabric tuning and BGP policies. Focus on scaling InfiniBand and Ethernet fabrics for 1,000+ node clusters and optimizing communication for AI training workloads.

Location: Onsite across Europe (Physical presence required for cabling and deployment)

Company

hirify.global is a company building and operating GPU AI factories.

What you will do

• Design and deploy InfiniBand (NDR 400G / HDR) and high-speed Ethernet fabrics for GPU clusters of 1,000+ nodes.
• Configure and operate Arista, Juniper, and Mellanox/NVIDIA equipment, managing BGP, OSPF, and VXLAN overlays.
• Tune RoCE and InfiniBand transport for collective communication workloads such as NCCL and UCX.
• Maintain network automation pipelines using Ansible, Netbox, and Nautobot across all sites.
• Troubleshoot performance regressions, packet loss, and congestion during live AI training runs.

Requirements

• 4+ years of datacenter networking experience, including InfiniBand or 400G/800G Ethernet at scale.
• Deep familiarity with RDMA, RoCE v2, and GPU training cluster communication patterns.
• Solid command of Linux networking internals, including DSCP, ECN, PFC, and adaptive routing.
• Experience with network-as-code tooling such as Ansible, Terraform, and Netbox, and CI/CD pipelines.
• Ability to interpret low-level diagnostics (tcpdump, perftest, ib_write_bw) and correlate them with application performance.