Senior Network Engineer

STN Inc; Poland; On-site; PLN 530,705 - 682,335; Full time

Job summary

STN Inc. seeks a Senior Network Engineer to design, deploy, and operate a high-performance networking fabric powering GPU clusters. You will work on InfiniBand/RoCE, BGP/OSPF/MPLS, and multi-site connectivity across customer and STN environments.

You will implement automation and runbooks, coordinate with NOC, and support SOC 2/security reviews while driving capacity planning and WAN optimization.

Qualifications

• 7+ years in network engineering with data center or service provider experience.
• Deep expertise in InfiniBand or RoCE (RoCEv2), including congestion control and NCCL tuning.
• Strong knowledge of BGP, OSPF, MPLS, VXLAN, and EVPN.
• Hands-on experience with Arista, NVIDIA Mellanox/Spectrum, or Cisco platforms.
• CCIE, JNCIE, NCIE, or equivalent advanced certification strongly preferred.

Responsibilities

• Design and configure InfiniBand or RoCE fabrics optimized for GPU training and distributed inference.
• Configure and operate switching, routing, and customer VLAN/VRF/VPC architectures.
• Manage BGP peering, public IP space, anycast, and DDoS protection.
• Design customer connectivity including cross-connects, dedicated links, VPN, and SD-WAN.
• Maintain network automation, configuration management, and source-of-truth tooling.
• Coordinate with the NOC on network monitoring, alerting, and runbook authoring.
• Troubleshoot complex network issues across layers 1 through 7.
• Maintain network documentation, diagrams, and operational runbooks.
• Drive network capacity planning aligned to fleet growth and customer commitments.
• Support security and compliance audits including SOC 2 and customer security reviews.

Skills

InfiniBand

RoCE

BGP

OSPF

MPLS

VXLAN

EVPN

Arista

Mellanox/Spectrum

Cisco

CCIE

JNCIE

NCIE

7+ years

Tools

Ansible

Python

Nautobot

Netbox

Job description

Senior Network Engineer

Infrastructure operations - shared across customers

Reports to: Director, Network Engineering

Location: Remote (US) or Pleasanton, CA (hybrid)

Department: Infrastructure & DC Operations / Network Engineering

Position summary

The Senior Network Engineer designs, deploys, and operates the high-performance networking fabric supporting GPU clusters. This includes InfiniBand and RoCE fabrics for training workloads, customer-facing connectivity, and the wide-area network that connects STN sites and customer environments.

Key responsibilities

• Design and configure InfiniBand or RoCE fabrics optimized for GPU training and distributed inference
• Configure and operate switching, routing, and customer VLAN/VRF/VPC architectures
• Manage BGP peering, public IP space, anycast, and DDoS protection
• Design customer connectivity including cross-connects, dedicated links, VPN, and SD-WAN
• Maintain network automation, configuration management, and source-of-truth tooling
• Coordinate with the NOC on network monitoring, alerting, and runbook authoring
• Troubleshoot complex network issues across layers 1 through 7
• Maintain network documentation, diagrams, and operational runbooks
• Drive network capacity planning aligned to fleet growth and customer commitments
• Support security and compliance audits including SOC 2 and customer security reviews

Required qualifications

• 7+ years in network engineering with data center or service provider experience
• Deep expertise in InfiniBand or RoCE (RoCEv2), including congestion control and NCCL tuning
• Strong knowledge of BGP, OSPF, MPLS, VXLAN, and EVPN
• Hands-on experience with Arista, NVIDIA Mellanox/Spectrum, or Cisco platforms
• CCIE, JNCIE, NCIE, or equivalent advanced certification strongly preferred

Preferred qualifications

• GPU cluster networking experience at multi-thousand-GPU scale
• SDN and automation skills (Ansible, Python, Nautobot, or Netbox)
• Multi-site WAN and peering experience including IX participation
• Familiarity with NVIDIA Cumulus, SONiC, or open networking stacks