Staff Network Architect – AI/HPC Fabric & Automation

Nscale; Greater London; On-site; GBP 90,000 - 130,000; Full time

Job summary

Nscale is seeking a Staff Network Engineer to lead and shape the AI-optimized network fabrics, including InfiniBand and Ethernet at scale. You will own architecture, automation, and security across data center sites, guiding complex technical decisions and mentoring engineers.

You will work closely with deployment, data center operations, platform engineering, and vendors to raise the bar on reliability and performance for ML scale-out workloads.

Qualifications

• 10+ years of network engineering experience in HPC/AI/ hyperscale or large-scale data center environments.
• Extensive hands-on experience with RDMA-aware networking for AI/HPC workloads, including InfiniBand and RoCE and OpenSM/UFM.
• Expert-level knowledge of data center routing and control planes: BGP, EVPN-VXLAN, Clos/spine-leaf; production on Cumulus, Nokia, Arista EOS.

Responsibilities

• Define, design, validate, and evolve large-scale InfiniBand/RoCE and Ethernet fabric architectures at rack, row, and data center scale.
• Own technical direction for high-performance Ethernet fabrics and establish reference architectures across sites.
• Design perimeter and security infrastructure (firewalls, NAT, VPN) across WAN and data center edge environments.
• Lead network automation strategy in a GitOps model with Python/Ansible tooling for provisioning and validation.
• Drive operational excellence through incident leadership, root-cause analysis, and automation to reduce toil.
• Set direction for observability, telemetry, monitoring, and alerting of fabric health and performance.

Skills

InfiniBand

RoCE

BGP

EVPN-VXLAN

LACP

QoS

Python

Ansible

Terraform

GitLab CI

GitHub Actions

OpenSM/UFM

Cumulus

Nokia

Arista EOS

Juniper SRX

Palo Alto

Firewall design

Observability

Telemetry

Tools

Python

Ansible

Terraform

GitLab CI

GitHub Actions

Job description

Nscale is seeking a Staff Network Engineer to lead and shape the AI-optimized network fabrics, including InfiniBand and Ethernet at scale. You will own architecture, automation, and security across data center sites, guiding complex technical decisions and mentoring engineers.

You will work closely with deployment, data center operations, platform engineering, and vendors to raise the bar on reliability and performance for ML scale-out workloads.