* Exciting 12-month contract opportunity with the Federal Government
* Based in Darwin, contributing to critical national projects
* Must be an Australian citizen with an active Baseline security clearance, or the ability to obtain one
We are seeking a Senior Network Engineer on behalf of a Federal Government client to design, secure, and optimise a complex, multi-site enterprise network that supports critical national operations.
In this senior technical role, you will lead network architecture enhancements, implement strengthened security controls, optimise performance, and troubleshoot complex issues across LAN/WAN environments. This is an ideal opportunity for engineers who thrive in secure, mission-critical environments and enjoy delivering high-impact, hands-on technical solutions
What You'll Do
* Design, implement and maintain enterprise network infrastructure
* Deliver network security uplift across distributed, high-security environments
* Configure and troubleshoot firewalls, routers, switches and associated technologies
* Monitor network performance, resolve issues and enhance resilience
* Produce professional architecture documentation and as-built records
* Collaborate with technical teams and stakeholders across multiple sites
What We're Looking For
* Strong experience across WAN/LAN, MPLS/VPLS, SD-WAN, VRFs, VLANs, VPNs
* Deep knowledge of BGP, OSPF, DNS, DHCP and related protocols
* Experience with firewalls, IDS/IPS, segmentation and network security tools
* Industry certs (CCIE/CCNP/CCNA or equivalent)
* Strong Cisco skills (FTD, routers, switches, ISE, DNAC)
* Excellent communication and technical writing skills
Nice to Have
* Architecture review and security gap analysis experience
* Exposure to OT environments (SCADA, DCS, PLC)
* Experience conducting network security risk assessments
Due to the nature of the role, applicants must be Australian Citizens and hold, or the ability to obtain a Baseline security clearance.
How to apply:
Apply directly or for more information on this role, please email Klarisse at or Zainab at
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Calleo is an equal opportunity employer and we encourage applications from all people including Aboriginal and Torres Strait Islander peoples.