Systems Engineer (Infrastructure)

Service Stream; City of Melbourne; Hybrid; AUD 110,000 - 170,000; Full time

Benefits offered by this job

Growth opportunities

Discounts

Paid leave

Culture

Job summary

Service Stream is seeking a hands-on Systems Engineer (Infrastructure) to support and uplift core infrastructure, cloud platforms, Microsoft 365, and security posture.

This full-time role in Melbourne (3 days in office, 2 days WFH) covers Windows/Linux admin, AWS/Azure, networking, automation, IaC, and DevOps practices to deliver secure, scalable environments.

Qualifications

• 3+ years' experience in systems administration or infrastructure engineering within a medium to large enterprise environment.
• Hands-on experience with Windows Server and Linux, cloud platforms, Microsoft 365, networking, patching, monitoring, and incident response.
• Experience contributing to infrastructure uplift initiatives, automation and IaC, DevOps, security hardening, and vulnerability remediation.

Responsibilities

• Administer and support Windows Server and Linux environments, ensuring security, patching, and high availability.
• Manage AWS and Azure cloud infrastructure, including compute, storage, networking, IAM, and cost optimisation.
• Oversee patching, vulnerability remediation, and Essential Eight-aligned controls.
• Manage SSL/TLS certificate lifecycle: issuance, renewal, monitoring, rotation.
• Deliver security hardening and remediation per the Security Improvement Plan (SIP).
• Support Microsoft 365 administration across Entra ID, Exchange Online, Teams, SharePoint, and Intune.
• Maintain enterprise networking infrastructure: firewalls, DNS, VPNs, load balancing, hardware lifecycle.

Skills

Windows Server

Linux

AWS

Azure

Microsoft 365

Networking

Security

DevOps practices

IaC

Terraform

CloudFormation

Bicep

PowerShell

Python

Ansible

Tools

Terraform

CloudFormation

Bicep

ARM templates

PowerShell

Python

Ansible

Git

CI/CD

Azure

AWS

Job description

Service Stream is seeking a hands-on Systems Engineer (Infrastructure) to join our Enterprise Technology team. This is an exciting opportunity for an experienced infrastructure professional who enjoys balancing day-to-day operational support with continuous improvement and security uplift initiatives.

Reporting to the Enterprise Technology Manager, you will play a key role in maintaining and enhancing our core infrastructure, cloud platforms, Microsoft 365 environment, and security posture. This is a broad technical role covering Windows and Linux administration, AWS and Azure cloud services, networking, automation, security remediation, and infrastructure-as-code.

If you're passionate about building secure, reliable, and scalable environments while driving operational excellence, we'd love to hear from you.

Location

Preference for candidates based in Melbourne, however we are also open to applicants located in Sydney, Brisbane, Adelaide or Perth. (3 days in the office and 2 days working from home).

Work type

full time permanent.

Requirements

must be an Australian Citizen

What you'll do

• Administer and support Windows Server and Linux environments, ensuring systems remain secure, patched, and highly available.
• Manage AWS and Azure cloud infrastructure, including compute, storage, networking, identity, and cost optimisation.
• Oversee operating system and application patching, vulnerability remediation, and Essential Eight-aligned controls.
• Manage the SSL/TLS certificate lifecycle, including issuance, renewal, monitoring, and rotation.
• Deliver security hardening and remediation activities aligned with the company's Security Improvement Plan (SIP).
• Support Microsoft 365 administration across Entra ID, Exchange Online, Teams, SharePoint, and Intune.
• Maintain enterprise networking infrastructure, including firewalls, DNS, VPNs, load balancing, and network hardware lifecycle management.
• Manage software, cloud, and infrastructure licensing, renewals, and vendor relationships.
• Respond to infrastructure incidents, perform root cause analysis, and contribute to after-hours support and maintenance activities as required.
• Develop and maintain Infrastructure-as-Code and automation solutions using tools such as Terraform, CloudFormation, Bicep, PowerShell, Python, and Ansible.
• Contribute to DevOps practices, including version control, peer reviews, CI/CD pipelines, and automated deployments.
• Manage backup, recovery, resilience, and disaster recovery processes.
• Create and maintain technical documentation, standards, and operational runbooks.

What You'll Bring

• Must be an Australian Citizen.
• 3+ years' experience in systems administration or infrastructure engineering within a medium to large enterprise environment.
• Hands-on experience supporting Windows Server, Linux, cloud platforms, Microsoft 365, networking, patching, monitoring, incident response, and technical documentation.
• Experience contributing to infrastructure uplift initiatives, including automation, Infrastructure-as-Code (IaC), DevOps practices, security hardening, and vulnerability remediation.
• Strong Windows Server administration skills, including Active Directory, Group Policy, DNS, DHCP, patching, and server lifecycle management.
• Experience administering and troubleshooting common Linux distributions.
• Administration experience across AWS (EC2, VPC, IAM, S3) and ideally exposure to Azure environments.
• Microsoft 365 administration experience, including Entra ID, Exchange Online, Teams, SharePoint, Intune, and licence management.
• Practical experience delivering security uplift and remediation activities, including patching, certificate management, secure configuration baselines, and alignment to formal security or remediation programs. Exposure to the Essential Eight is highly regarded.
• Working knowledge of enterprise networking, including support of network infrastructure, vendors, and support contracts.
• Experience managing software and cloud licensing, renewals, and vendor relationships.
• Hands-on experience with Terraform, CloudFormation, Bicep, ARM templates, PowerShell, Python, Ansible, or similar automation and IaC tools.
• Exposure to modern DevOps practices, including Git-based version control, peer reviews, CI/CD pipelines, and controlled deployment processes.
• The ability to maintain audit evidence, document remediation activities, and work closely with cyber security and governance teams.
• Exposure to utilities, telecommunications, field services, or infrastructure-based organisations will be highly regarded.

About Us

Service Stream is an equal opportunity ASX-listed organisation that develops and operates Australia's essential service networks across telecommunications, utilities, transport, defence and social infrastructure. Our work supports and connects communities across the nation.

Benefits of Working with Us

• Growth - Build your technical capability across cloud, infrastructure, security and modern workplace technologies.
• Discounts - Access to hundreds of retail and service discounts including Woolworths, JB Hi-Fi, Airbnb and Bupa.
• Paid Leave - Parental, cultural, community service, study, corporate volunteering and purchased leave options.
• Culture - Join a team that values accountability, collaboration, inclusion and continuous improvement.

We celebrate diversity at Service Stream and welcome applications from Aboriginal and/or Torres Strait Islander peoples, people with disability or neurodivergence, and those from LGBTIQA+, Veteran or other diverse groups.

Applications will not be accepted via email. If you require reasonable adjustments to the recruitment process, please email [e-mail].