Senior Network Engineer

Job Summary 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. The role serves 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 experience operating as 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, NetFlow/sFlow, syslog, packet capture/analysis). Familiarity with high‑performance networking concepts: RDMA / RoCEv2 (preferred) InfiniBand (nice to have) DPU/SmartNIC architectures (nice to have) Experience with cloud and hybrid networking, 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). Compensation Total compensation package may be inclusive of annual incentive bonus and equity (long‑term incentive). Relocation or living‑out allowance / per diem (as applicable 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 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. Equal Opportunity and E‑Verify IE US Operations Inc., a member of the IREN group, is an equal‑opportunity employer committed to creating an inclusive workplace. We evaluate qualified applicants and do not discriminate against protected characteristics under applicable legislation. IREN participates in E‑Verify and will provide the federal government with Form I‑9 information to confirm that you are authorized to work in the United States. #J-18808-Ljbffr