AWS System Engineer

Primary Location VIC - Melbourne - 655 Collins St Job Description Summary At Service Stream, we deliver and operate critical infrastructure across telecommunications, utilities, transport, defence and social infrastructure sectors. As we continue to enhance our technology landscape, we're looking for an experienced AWS Systems Engineer to support and optimise our cloud, infrastructure and Microsoft 365 environments. Reporting to the Head of Enterprise Technology, this is a hands on role focused on operational excellence, security uplift and continuous improvement across a national technology environment.

About the Role

Location: Collins Street, Melbourne.

Work type: Full time permanent.

Working requirements: As this role supports our Defence contract, you must be an Australian Citizen and able to obtain and maintain a Defence Security Clearance.

As our AWS Systems Engineer, you will be responsible for the day-to day administration and optimisation of AWS, Microsoft 365, Windows and Linux environments. You'll play a key role in ensuring our platforms remain secure, patched, resilient and highly available while driving automation and operational efficiencies. This is a genuine run and improve position, ideal for someone who enjoys owning operational outcomes, solving complex technical issues, and continuously improving systems and processes.

Cloud Administration

Administer and optimise AWS environments, including EC2, VPC, IAM, S3 and cloud networking. Support Azure services and hybrid cloud environments. Monitor performance, utilisation and cloud costs to ensure efficient operations.

Infrastructure & Systems Management

Manage and support Windows Server and Linux environments. Maintain Active Directory, Group Policy, DNS and DHCP services. Perform system patching, hardening, upgrades and lifecycle management.

Microsoft 365 Administration

Manage and support Microsoft 365 services including: Entra ID, Exchange Online, Teams, SharePoint Online, Intune. Administer user access, devices, licensing and identity services.

Security & Vulnerability Management

Drive security improvement initiatives and platform hardening. Manage vulnerability remediation programs and patch compliance. Support Essential Eight maturity initiatives and security uplift activities. Manage SSL/TLS certificate lifecycles and renewals.

Networking & Vendor Management

Support enterprise networking technologies including firewalls, DNS, VPN and load balancing. Manage network equipment lifecycle activities and firmware updates. Build and maintain strong relationships with vendors and service providers.

Automation & Continuous Improvement

Develop automation solutions using PowerShell and Python. Identify opportunities to reduce manual effort and improve operational efficiency. Contribute to infrastructure as code and platform standardisation initiatives.

Monitoring, Backup & Recovery

Maintain monitoring and alerting across infrastructure and cloud platforms. Participate in incident response and root cause investigations. Manage backup, recovery and resilience processes to support business continuity.

What You'll Bring

• 3+ years' experience in systems administration or infrastructure engineering.
• Strong AWS administration experience across core cloud services.
• Hands on experience supporting Windows Server and Linux environments.
• Microsoft 365 administration experience, including Entra ID, Exchange Online, Teams, SharePoint and Intune.
• Experience managing patching, vulnerability remediation and security controls.
• Knowledge of enterprise networking technologies including DNS, VPNs and firewalls.
• Scripting and automation experience using PowerShell and/or Python.
• Strong troubleshooting, analytical and problem solving skills.
• Excellent stakeholder engagement and communication skills.
• A proactive mindset with a passion for continuous improvement.

Desired Qualifications

• Degree in Information Technology, Computer Science, Engineering or a related discipline.
• AWS Solutions Architect Associate or AWS SysOps Administrator certification.
• Azure Administrator (AZ-104) or Azure Security (AZ-500) certification.
• Microsoft 365 certifications such as MS-102 or MD-102.
• Cisco CCNA or equivalent networking certification.
• ITIL Foundation certification.
• Security focused certifications such as CompTIA Security+ or Microsoft SC-200 are 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 - Career development and internal mobility opportunities across our diverse business.
• 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 - A workplace that values diversity, inclusion and celebrates excellence.

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.

If you require reasonable adjustments to the recruitment process, please email .

Service Stream, together with its subsidiaries and affiliates, is a leading national service provider to develop and operate Australia's essential communications, energy and water networks in the telecommunications and utilities industries. We specialise in the design, construction and maintenance of new and existing networks, and deliver end to end engineering and asset management solutions on behalf of our blue chip client base.