Network Engineer / Senior Network Engineer

About the role

Firmus Technologies, a global provider of AI infrastructure, is looking for a Network Engineer or Senior Network Engineer to join its Engineering and Technology team in Sydney. You will lead the development of network designs and support network deployment for AI infrastructure projects, reporting to the Senior Manager, Networking.

Key responsibilities

• Design, implement and maintain the corporate LAN, WAN, WLAN and VPN infrastructure, ensuring high availability, performance and security of on-premise and cloud-connected services.
• Set up and maintain secure site-to-site VPNs, MPLS links and private interconnects between data centres, customer sites, cloud environments and partner networks.
• Develop and maintain automated network configurations with IaC tools (e.g. Ansible, Netbox, Python scripts) and CI/CD pipelines for network changes.
• Manage firewalls and security devices, applying firewall rules, VLAN segmentation, ACLs and zero-trust principles, and work with the Security and Risk team on policy enforcement and incident response.
• Resolve escalated network issues and outages, analyse logs, run diagnostics and coordinate with vendors and carriers.
• Help set up monitoring tools, analyse bandwidth and hardware utilisation trends, and design redundant paths, failover mechanisms and disaster recovery playbooks.
• Take part in the operation standby roster and on-call duty.
• Support the deployment team on project management and resource allocation for network parts of AI cluster installations, and work with the Global Operations Centre, SDI and Data Centre teams to maintain SLAs.
• Mentor junior network engineers, share knowledge across teams and maintain technical documentation.

Required profile

• Bachelor's degree in network engineering, computer science or a related technical field.
• 8+ years of network engineering experience, with a focus on AI infrastructure.
• Experience with Linux host network configuration and Linux networking fundamentals.
• Strong project management skills, problem-solving and analytical abilities, and ability to work independently and in a team.
• Willingness to travel internationally and domestically for on-site deployments and commissioning.

Required skills

• Enterprise and AI network delivery (LAN, WAN, WLAN, VPN) and secure connectivity (MPLS, private interconnects).
• Network automation and NetDevOps (IaC, Ansible, Python, CI/CD).
• Network security (firewalls, VLANs, ACLs, zero-trust).
• Hands-on experience with NVIDIA InfiniBand, Spectrum Ethernet Platform and/or RoCE preferred.
• Familiarity with open-source OS such as Cumulus Linux and Sonic.