About RexTechnologies

RexTechnologies is a growing IT services and managed technology solutions provider delivering network, infrastructure, cloud, service desk and onsite technical support services to customers across Australia and internationally.

We are seeking an experienced Computer Network and Systems Engineer to plan, deploy, administer, maintain and optimise network and systems infrastructure across multiple customer environments.

About the Role The successful candidate will take responsibility for the configuration, operational readiness, performance and reliability of network and system services. The role involves hands-on implementation, systems administration, network engineering, complex troubleshooting and infrastructure improvement projects.

The position requires travel to customer locations across Sydney and, occasionally, other locations as required.

Key Responsibilities

- • Plan, design, deploy, test and optimise network and system infrastructure.
- Install, configure and administer servers, operating systems, virtual environments and business applications.
- Configure and support routers, switches, firewalls, wireless access points, VPNs and related network equipment.
- Administer Windows Server, Active Directory, Microsoft Entra ID and Microsoft 365.
- Manage DNS, DHCP, TCP/IP, VLANs, routing, switching, LAN, WAN and Wi-Fi services.
- Monitor system and network availability, performance, capacity and security.
- Diagnose and resolve complex network, server, infrastructure and connectivity issues.
- Perform upgrades, patching, software deployments and infrastructure maintenance.
- Support backup, disaster recovery, business continuity and system-recovery processes.
- Manage endpoint and security solutions,



including Microsoft Intune and antivirus platforms.
- Conduct fault finding, root-cause analysis and corrective-action planning.
- Maintain technical documentation, network diagrams, change controls and asset records.
- Participate in network upgrades, cloud migrations, office relocations and infrastructure deployments.
- Coordinate with customers, vendors, telecommunications providers and internal teams.
- Ensure services meet agreed SLAs, security requirements and customer standards.
- Provide onsite and remote support, including scheduled after-hours work when required.

Skill & Experience

- Demonstrated experience in network engineering, systems administration or infrastructure engineering.
- Strong experience supporting Microsoft Windows Server and Windows desktop environments.
- Practical experience with Microsoft 365, Exchange Online, Active Directory and Microsoft Entra ID.
- Strong knowledge of TCP/IP, DNS, DHCP, VLANs, VPNs, routing, switching, LAN, WAN and wireless networking.
- Experience configuring and troubleshooting switches, routers, firewalls and wireless infrastructure.
- Experience with virtualisation platforms such as VMware or Microsoft Hyper-V.
- Knowledge of backup, disaster recovery, monitoring and endpoint-management solutions.
- Robust troubleshooting, fault-finding and root-cause-analysis skills.
- Experience using IT service-management platforms such as Jira Service Management, ServiceNow or similar.
- Ability to prepare clear technical documentation, network diagrams and implementation plans.
- Strong communication, customer-service and stakeholder-management skills.
- Ability to work independently and manage multiple technical priorities.
- Willingness to travel to customer locations as required.

📌 Computer Network and Systems Engineer (North Ryde)
🏢 Rextechnologies. pty.Limited.
📍 North Ryde