Sr System Engineer (Wintel)

Unisys; Melbourne; On-site; AUD 130,000 - 170,000; Full time

Job summary

Unisys in Melbourne is seeking an experienced IT Infrastructure Engineer to support and maintain enterprise identity, PKI, and cloud infrastructure across on‑premises and cloud environments. You will administer Windows Server, Active Directory, Microsoft Entra ID, Entra Connect, and Keyfactor Command while ensuring system availability, security, and compliance.

Responsibilities include incident response, root cause analysis, automation, health checks, and documenting runbooks; you will also

Qualifications

• Proven experience with Windows Server administration.
• Strong knowledge of PKI and certificate management; experience with KeyFactor Command preferred.
• Hands‑on Active Directory and Domain Controller experience.
• Experience with Entra Connect and Entra ID - configuration and troubleshooting.
• Familiarity with Azure AVD and Nerdio - for desktop virtualization.
• Experience integrating on-prem identity with cloud services.
• Scripting skills - for automation and operational tasks.
• Solid troubleshooting and incident management skills.
• Good communication skills and ability to work within cross‑functional teams.
• NV1 security clearance must have for this role.

Responsibilities

• Operate and maintain Windows Server environments - including patching, hardening, and troubleshooting
• Manage PKI and certificate lifecycle - design, issue, renew, and revoke certificates; administer KeyFactor Command
• Administer Active Directory and Domain Controllers - including GPOs, replication, and AD health
• Support cloud identity and connectivity - Entra Connect, Entra ID, and integration with on-prem systems
• Manage AWS Connect - integrations and related cloud services
• Deploy and support Azure Virtual Desktop - environments and user profiles
• Administer Nerdio - or AVD provisioning and management
• Participate in incident response, root cause analysis, and postmortems
• Automate operational tasks using scripting where appropriate
• Document runbooks, run regular health checks, and provide knowledge transfer

Skills

Windows Server

PKI & certificate management

Active Directory

Entra Connect

Entra ID

Azure Virtual Desktop

Nerdio

Cloud integration

Scripting

Incident management

Communication

NV1 clearance

Tools

KeyFactor Command

VMware

CyberArk

AWS

Entra Connect

Job description

Support and maintain enterprise identity, PKI, and cloud infrastructure services across on-premises and cloud environments. Responsible for the administration of Windows Server, Active Directory, Microsoft Entra ID, Entra Connect, and Keyfactor Command, while supporting Azure Virtual Desktop (AVD), Nerdio, and AWS-integrated solutions. The role focuses on ensuring system availability, security, and compliance through incident management, certificate lifecycle administration, automation, monitoring, troubleshooting, and continuous service improvement.

Key responsibilities

• Operate and maintain Windows Server environments - including patching, hardening, and troubleshooting
• Manage PKI and certificate lifecycle - design, issue, renew, and revoke certificates; administer KeyFactor Command
• Administer Active Directory and Domain Controllers - including GPOs, replication, and AD health
• Support cloud identity and connectivity - Entra Connect, Entra ID, and integration with on-prem systems
• Manage AWS Connect - integrations and related cloud services
• Deploy and support Azure Virtual Desktop - environments and user profiles
• Administer Nerdio - or AVD provisioning and management
• Participate in incident response, root cause analysis, and postmortems
• Automate operational tasks using scripting where appropriate
• Document runbooks, run regular health checks, and provide knowledge transfer

About you

• Proven experience with Windows Server administration
• Strong knowledge of PKI and certificate management - experience with KeyFactor Command preferred
• Hands‑on Active Directory and Domain Controller experience
• Experience with Entra Connect and Entra ID - configuration and troubleshooting
• Familiarity with Azure AVD and Nerdio - for desktop virtualization
• Experience integrating on-prem identity with cloud services
• Scripting skills - for automation and operational tasks
• Solid troubleshooting and incident management skills
• Good communication skills and ability to work within cross‑functional teams
• NV1 security clearance must have for this role

Nice to have

• VMware - administration experience.
• CyberArk Machine Identity or other machine identity management experience.
• Experience with AWS services.
• Certifications such as Microsoft Certified - Azure Administrator, Microsoft Certified: Identity and Access Administrator, or relevant security certifications.