Senior Network Engineer

Job description 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) 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. Job requirements 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 InfiniBand environments(if applicable), including PFC, ECN, and lossless fabric tuning. Automate network provisioning, configuration management, and remediation using Python, Ansible, Terraform, or similar tools. Job responsibilities Proven experienceoperatingas a Tier 3 / escalation engineer handling complex, high-impact production issues. Deepexpertisein: Layer 2/3 networking (VLANs, VXLAN, EVPN) Routing protocols (BGP, OSPF, IS-IS) Data center fabric design (Clos, ECMP) 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, NetFlow/sFlow, syslog, packet capture/analysis). Familiarity with high-performance networking concepts: RDMA / RoCEv2 (preferred) InfiniBand (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). Job benefits At IREN, we offer a highly competitive compensation package that includes base salary, annual performance incentives, and opportunities to build long-term wealth through equity programs. These offerings are part of our broader total rewards package , thoughtfully designed to support your health, well-being, and long-term success. Compensation 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) Health & Wellness 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 Retirement & Financial Wealth 401(k) retirement plan with company match Access to financial planning and legal services Time Off & Leave Programs Paid Time Off (PTO) and paid holidays Growth & Development Internal skills training and advancement pathways Professional development to support certifications, continuing education, or role related training Community & Culture Company events and team-building activities We value diverse perspectives and believe that skills can be developed. If you're passionate about this role, we want to hear from you - whether you meet every criteria or not. Your unique experiences might be exactly what we need! IE US Operations Inc., the employing entity and proud member of the IREN group is an equal opportunity employer that is committed to creating an inclusive workplace. We are committed to evaluating qualified applicants and do not discriminate against protected characteristics under applicable legislation. IE US Operations, Inc. "IREN" participates in E-Verify and will provide the federal government with your Form I-9 information to confirm that you are authorized to work in the United States. By applying for this position and submitting your resume and application materials, you consent to the processing of your personal information in accordance with our Job Applicant Privacy Statement available on our website at IREN Limited