About AC3 At AC3, we don't just run infrastructure, we humanise technology. Our mission is to cut through complexity and deliver real outcomes that empower Australia's most critical organisations. We're growing our Site Reliability team and looking for a Linux (RHEL) Systems Administrator who wants to do more than just keep the lights on. If you're passionate about automation, resilience, and problem solving, this is your chance to join a company that sits at the heart of Australia's secure digital transformation. Why Join AC3? Work that matters - You'll support some of Australia's most critical services and organisations. Culture that backs you - At AC3, collaboration isn't just a buzzword. We win and grow as one team. Tech you'll love - From RHEL on-prem systems to automation with Ansible, Puppet, and beyond, you'll sharpen your skills with the best tools available. Growth you own - We invest in your certifications, development, and career trajectory. Security you can trust - As an Australian owned provider with Defence grade clearances, you'll work in an environment built on trust and security. The Role As a Platforms Engineer Site Reliability (Linux), you'll be a key player in keeping AC3's on-prem infrastructure running at peak performance. You'll lead on RHEL administration, drive automation, and support authentication and monitoring systems that keep our platforms secure and reliable. This role requires you to be an Australian Citizen and hold (or be eligible for) Baseline Security Clearance. Key Responsibilities Manage and optimise AC3's Linux (RHEL) platform fleet, provisioning, patching, configuration, and troubleshooting. Automate Linux platform tasks with Ansible, Puppet, Bash, or Python. Monitor and maintain critical infrastructure with >99.99% availability. Collaborate with peers across Platforms, Cloud, and Security teams. Participate in on-call rotations for Linux services and platform escalations. About You Minimum 3 years in a Linux Systems Administration role (RHEL focus). Proven experience in automation/orchestration (Ansible, Puppet). Strong troubleshooting skills in on-prem Linux environments. Comfortable scripting in Python, Ruby or similar. Excellent communicator who thrives in collaborative teams. Must be an Australian Citizen, Baseline Security Clearance required. Ready to make technology real? At AC3, you won't just keep systems running you'll shape the platforms that support Australia's future. If you're a Linux specialist who wants meaningful work in a high trust environment, apply now and take your next step with AC3.
