Senior MSP System Administrator: Windows & Cloud

C4X Technology Architects; City of Canada Bay; On-site; AUD 90,000 - 120,000; Full time

Job summary

C4X Technology Architects in Sydney is seeking an experienced System Administrator to own customer infrastructure administration, support, and continuous improvement across multiple SMB to enterprise environments.

You will work with Microsoft 365, Intune, Entra ID, Active Directory, Windows Server, virtualization, networking and endpoint management, providing escalation support and ensuring secure, stable, high‑performing environments.

Qualifications

• 5+ years’ experience in System Administration or Infrastructure Support.
• Experience supporting multiple client environments and MSP-style environments.
• Strong troubleshooting and documentation skills.
• Ability to automate repetitive administration tasks.

Responsibilities

• Administer and support Windows Server, including maintenance and upgrades.
• Manage Active Directory, Group Policy, DNS, DHCP, Entra ID, Microsoft 365, and Intune environments.
• Support VMware and/or Hyper‑V virtualization platforms.
• Provide L3 escalation support across infrastructure, endpoint, identity, and networking.
• Monitor health, performance and security; maintain DR and BC plans.
• Troubleshoot networking including VPNs, switches and firewalls.
• Perform RCA and implement long-term fixes; contribute to projects and migrations.
• Create and maintain accurate documentation and knowledge articles.

Skills

System administration

Troubleshooting

Documentation

Automation mindset

Customer infrastructure support

Tools

Microsoft 365

Intune

Entra ID

Active Directory

Windows Server

VMware/Hyper-V

PowerShell

Job description

Following several years of uninterrupted growth, C4X Technology Architects is expanding our Sydney team and seeking an experienced, hands-on System Administrator.

C4X is a leading MSP supporting globally recognised brands across Australia. Built by technologists, we are known for technical excellence, trusted partnerships, and delivering the right outcomes for our clients.

We are looking for a System Administrator with 5+ years’ experience, ideally within an MSP and supporting clients in the automotive industry, who can take ownership of customer infrastructure administration, support, and continuous improvement.

You will work across Microsoft 365, Intune, Entra ID, Active Directory, Windows Server, virtualisation, networking, and endpoint management, providing escalation support and helping maintain secure, stable, and high-performing environments.

This role suits someone who has supported multiple SMB environments and is looking to broaden their experience within larger mid-market and enterprise organisations. Strong troubleshooting skills, infrastructure fundamentals, and a willingness to learn are essential.

Following several years of uninterrupted growth, C4X Technology Architects is expanding our Sydney team and seeking an experienced, hands-on System Administrator.

C4X is a leading MSP supporting globally recognised brands across Australia. Built by technologists, we are known for technical excellence, trusted partnerships, and delivering the right outcomes for our clients.

We are looking for a System Administrator with 5+ years’ experience, ideally within an MSP and supporting clients in the automotive industry, who can take ownership of customer infrastructure administration, support, and continuous improvement.

You will work across Microsoft 365, Intune, Entra ID, Active Directory, Windows Server, virtualisation, networking, and endpoint management, providing escalation support and helping maintain secure, stable, and high-performing environments.

This role suits someone who has supported multiple SMB environments and is looking to broaden their experience within larger mid-market and enterprise organisations. Strong troubleshooting skills, infrastructure fundamentals, and a willingness to learn are essential.

About the Role

This is primarily an operational System Administrator role with opportunities to contribute to infrastructure projects, migrations, upgrades, and continuous improvement initiatives.

You will be responsible for maintaining customer environments, resolving escalated issues, identifying recurring problems, and implementing long-term solutions.

Key Responsibilities

• Administer and support Windows Server, including maintenance, patching, upgrades, and troubleshooting.
• Manage Active Directory, Group Policy, DNS, DHCP, Entra ID, Microsoft 365, and Intune environments.
• Support VMware and/or Hyper-V virtualisation platforms.
• Provide L3 escalation support across infrastructure, endpoint, identity, networking, and Microsoft 365 technologies.
• Monitor infrastructure health, performance, capacity, availability, backups, and security.
• Support backup, disaster recovery, and business continuity solutions.
• Troubleshoot networking technologies including switching, routing, firewalls, VPNs, and wireless environments.
• Perform Root Cause Analysis (RCA) and implement long-term solutions to recurring issues.
• Support infrastructure projects, including upgrades, migrations, technology refreshes, and change activities.
• Use PowerShell and automation tools to improve efficiency and reduce manual administration.
• Maintain accurate technical documentation, procedures, and knowledge articles.
• Collaborate with engineers, vendors, and technology partners to resolve complex issues and drive continuous improvement.
• Participate in planned maintenance and occasional after-hours support when required.

Key Responsibilities

• Keep customer infrastructure stable, secure and well maintained.
• Take ownership of escalated technical issues and drive them through to resolution.
• Proactively identify and resolve infrastructure risks before they become incidents.
• Reduce recurring incidents through Root Cause Analysis and permanent fixes.
• Maintain high-quality documentation.
• Help improve the technical capability of the wider Service Desk.
• Automate repetitive administration wherever practical.
• Contribute to the ongoing improvement and standardisation of customer environments.

Skill & Experience

• 5+ years’ experience in System Administration, Infrastructure Support, or Systems Engineering.
• Previous MSP experience.
• Experience supporting automotive, healthcare, and construction clients.
• Experience managing multiple customer environments and competing priorities.
• Experience administering Microsoft 365.

Microsoft Technologies

• Strong knowledge of Intune, including device management, compliance, application deployment, updates, endpoint security, and AppLocker.
• Working knowledge of Entra ID, MFA, and Conditional Access.
• Experience with Active Directory, Group Policy, and Autopilot.

Cyber Security

• Strong knowledge of security solutions including Huntress, Perception Point, Deep Instinct, DefenceX, and DNSFilter.

Windows Infrastructure

• Strong knowledge of Windows Server, Active Directory, Group Policy, DNS, DHCP, file services, patching, monitoring, and troubleshooting.
• Experience supporting VMware and/or Hyper-V environments, including hosts, storage, snapshots, performance, and availability.

Networking

• Working knowledge of TCP/IP, DNS, DHCP, VLANs, switching, routing, firewalls, VPNs, and Wi-Fi.

Communications & Automation

• Strong knowledge of 3CX, Microsoft Teams, and PowerShell.
• Ability to automate repetitive tasks and improve operational efficiency.

Tools

Troubleshooting & Ownership

• Strong troubleshooting and analytical skills.
• Ownership of issues through to resolution.
• Experience performing RCA and implementing permanent fixes.
• Ability to prioritise work across multiple environments.
• Strong communication and documentation skills.

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