Senior Network Engineer

Job Type:Full-time | Department:
Network |Reporting to:

Associate Director, Network | Work Location Type: #onsite #remote #hybrid

IREN is a leading AI Cloud Service Provider, delivering large-scale GPU clusters for AI training and inference. IREN’s vertically integrated platform is underpinned by its expansive portfolio of grid-connected land and data centers in renewable-rich regions across the U.S. and Canada.

With 100% renewable energy, we build, own and operate our data centers and take pride in being at the forefront of sustainable solutions for the ever-evolving applications of high-performance compute. We believe that human progress is invaluable, but it should be done in the right way – responsibly, sustainably and having a positive impact on the communities we operate in.

The Senior Network Engineer (Tier
3) is responsible for designing, operating, and optimizing high-performance data center networks that power large-scale AI/ML and cloud infrastructure. Acts as the escalation point for complex network issues, driving deep technical troubleshooting, automation, and reliability improvements across multi-site, high-throughput environments.

• Act as a Tier 3 (L3) escalation point for complex network incidents, providing deep technical troubleshooting and root cause analysis beyond Tier 1/2 support.
• Partner with Network Operations (Tier 1/2) teams to resolve escalated issues, improve runbooks, and reduce recurring incidents through automation and systemic fixes.
• Lead resolution of critical, high-impact network incidents affecting AI/ML workloads, data center operations, and customer environments.
• Develop and refine operational procedures, playbooks, and escalation paths to enhance efficiency across Tier 1/2/3 support models.
• Identify opportunities to shift-left operational knowledge by mentoring junior engineers and improving observability and tooling.
• Maintain accurate network documentation, diagrams, and design standards, supporting compliance and audit requirements
• Optimize network performance for distributed training workloads, including tuning for large flows, incast, and burst traffic patterns.
• Support RDMA/RoCEv2 or Infini Band environments(if applicable), including PFC, ECN, and lossless fabric tuning.
• Automate network provisioning, configuration management, and remediation using Python, Ansible, Terraform, or similar tools.

• Proven experienceoperatingas a Tier 3 / escalation engineer handling complex, high-impact production issues.
• Layer 2/3 networking (VLANs, VXLAN, EVPN)
• Routing protocols (BGP, OSPF, IS-IS)
• Strong hands-on experience with major networking vendors (e.g., Cisco, Juniper, Arista) and/or open networking platforms.
• Experience with network automation and infrastructure-as-code, including scripting in Python and using tools like Ansible or Terraform.
• Solid understanding of network performance tuning, including buffer management, queueing, QoS, and congestion control.
• Experience with network observability tools (SNMP, streaming telemetry, Net Flow/sFlow, syslog, packet capture/analysis).
• Familiarity with high-performance networking concepts:
  • RDMA / RoCEv2 (preferred)
  • Infini Band (nice to have)
  • DPU/SmartNICarchitectures (nice to have)
• Experience with cloud and hybrid networki ng, including VPC design, peering, and connectivity to public cloud providers
• Bachelor’s degree in Computer Science, Network Engineering, Information Technology, or related field (or equivalent practical experience).

• Total Compensation package may be inclusive of annual incentive bonus, equity (long-term incentive).
• Relocation or Living-out-allowance / per diem (as appliable and based on successful candidate circumstances)
• 100% company paid health insurance premiums(medical, dental, and vision) for employees, 75% company paid coverage for dependents
• Company-paid short-term and long-term disability insurance
• Voluntary life, critical illness, and accident coverage available
• Health Savings Accounts (HSA) – when combined with the High Deductible Health Plan
• Employee Assistance Program and wellness resources
• 401(k) retirement plan with company match
• Access to financial planning and…