Amentum is continually expanding our opportunities working on prominent defence projects across air, land and sea supporting the critical capabilities that keep Australia safe. We have a growing presence in cyber, space and nuclear programs. Tell me about this role: Seeking an NV2 cleared Infrastructure Systems Administrator , you will play a critical role in ensuring the stability, security and performance of the Fleet Battle Lab System . You will work across Windows, Linux, virtualisation and network environments, supporting highly available, secure infrastructure in line with Defence cyber standards. This role suits an experienced administrator who enjoys working in complex technical environments, collaborating with stakeholders, and contributing to a high‑performing operational team. What will I be doing day to day? Administer and maintain Windows Server 2022 and Red Hat Enterprise Linux 8 environments Manage Active Directory, Group Policy, DNS, DHCP , and system security hardening Configure, support and optimise Hyper‑V and VMware virtualisation platforms Manage Veeam Backup & Replication , including testing and disaster recovery planning Configure, monitor and troubleshoot Cisco switches/routers and FortiGate firewalls Support LAN, WAN and VPN infrastructure with a strong focus on uptime and security Monitor system and network performance, applying patches, updates and hotfixes Assist with integration of simulation systems and supporting architectures Automate administrative tasks using PowerShell and Bash scripting Provide Tier 2/3 support , investigate incidents and document solutions Work with vendors and stakeholders following formal change management processes Maintain up‑to‑date technical documentation for systems, services and processes Contribute to a collaborative, high‑performing team culture and operational excellence What sort of skills do I need? Minimum 5 years’ experience in systems administration within medium to large IT environments Tertiary qualifications in IT, or equivalent industry certifications , such as: Microsoft Certified: Windows Server Administrator, RHCSA / RHCE, VMware Certified Professional (VCP), Cisco CCNA / CCNP, Fortinet NSE (4 or higher), Veeam Certified Engineer (VMCE), CompTIA Security or Network Strong experience administering Windows Server and/or Linux (RHEL) systems Hands‑on experience with Hyper‑V, VMware and Veeam Backup & Replication Strong knowledge of Active Directory, DNS, DHCP and Group Policy Proven experience with Cisco networking and FortiGate firewalls , including VLANs, routing, VPNs and multicast Solid understanding of networking concepts: TCP/IP, routing, switching and VPNs Ex‑serving Defence member with an IT or Combat Systems Operations background (Desirable) Exposure to C4I systems such as Link 16 or GCCS and strong proficiency in PowerShell and Bash for automation and system management (Desirable) What’s in it for me? Flexibility - We like our employees to have the flexibility they need to live the lives they choose. With flexible working options such as WFH where possible. Inclusion - Our employees should feel safe bringing their whole self to work, we offer a number of programs promoting inclusion. Benefits and Rewards – Our benefits and rewards includes additional superannuation; flexible leave options; salary continuation insurance; professional certification bonus; employee discount program. What’s in it for me? Flexibility - We like our employees to have the flexibility they need to live the lives they choose. With flexible working options such as WFH where possible. Inclusion - Our employees should feel safe bringing their whole self to work, we offer a number of programs promoting inclusion. Benefits and Rewards – Our benefits and rewards includes additional superannuation; flexible leave options; salary continuation insurance; professional certification bonus; employee discount program. Amentum: Trusted Partner in National Security Amentum is a key service provider to the Australian Government, supporting critical national security and Defence capabilities across land, air, maritime, cyber, space, nuclear, and digital domains. With over 880 professionals nationwide, we deliver complex infrastructure, logistics, and technical solutions with a strong focus on quality, safety, and innovation. With 27 years of experience and a presence in major cities and regions, we’re proud of our people—our greatest asset. Join us and be part of a high-performing team with exceptional benefits and career opportunities. Apply directly or reach out to Jeremy Parkinson, [email protected] .