Senior DevOps Engineer

Optus Critical Network Services (CNS) keeps the backbone of Australia's network running. We manage critical infrastructure that serves millions of consumers and enterprise customers - spanning DNS, DHCP, RADIUS, ACS, and a 40+ application estate hosted across a hybrid on premises and cloud environment.

We are seeking a Senior DevOps Engineer with a strong telco pedigree to join our team. This is not a cloud only role. You will work across bare metal servers, virtualised environments (Proxmox/KVM, VMware), containerised platforms, and cloud environments - driving the modernisation of legacy ISP infrastructure into highly available, automated, and observable platforms.

This role suits someone who can operate at the intersection of platform architecture and hands on engineering - equally comfortable presenting a solution design to an Architecture Review Board and standing up a Kubernetes cluster from scratch. You will bring an automation first mindset and the depth to navigate complex, interconnected systems where stability is non negotiable.

You will work closely with network engineers, platform architects, InfoSec, and operations teams to ensure our systems are stable, secure, scalable, and deployable with confidence.

What you'll do

• Design, build, and maintain scalable hybrid infrastructure spanning on premises virtualisation platforms (Proxmox/KVM, VMware) and cloud environments.
• Design, build, and maintain CI/CD pipelines using Jenkins, GitLab CI, Ansible, or equivalent tooling to automate build, test, and deployment processes.
• Manage and enhance ISP core network service platforms including RADIUS, DHCP, DNS, ACS/TR 069, TACACS+, NTP, and provisioning/activation systems.
• Monitor system performance, availability, reliability, and security using observability tooling - Grafana, Prometheus, VictoriaMetrics, ELK, Dynatrace, or similar.
• Embed DevSecOps practices across the software and infrastructure delivery lifecycle - secrets management (Vault), image scanning, least privilege IAM, and network segmentation. Optimise and administer PostgreSQL, MySQL/Percona, and MongoDB databases in production environments. Provide Tier 3 (T3) escalation support for critical platform incidents.

What makes you perfect for the role?

• 6-8 years of hands on platform engineering, cloud infrastructure, or software engineering experience - with a minimum of 2 years in a telco, ISP, or carrier grade environment.
• Strong hands on experience with Proxmox VE/KVM (preferred) or VMware vSphere/ESXi - deployment, scaling, RBAC, networking, storage, and upgrades.
• Strong experience with CI/CD tooling - GitLab CI, Jenkins, GitHub Actions, or Azure DevOps.
• Hands on experience with Terraform and/or Ansible for infrastructure provisioning and configuration management. Strong scripting capability in Python and/or Bash - automation first mindset.
• Strong knowledge of RADIUS, DHCP, DNS, TACACS+, NTP, ACS/TR 069, and related ISP protocols.
• Experience with monitoring, logging, alerting, and observability tooling - Grafana, Prometheus, Loki, ELK, VictoriaMetrics, or equivalent.
• Production grade experience with PostgreSQL, MySQL/Percona, and MongoDB.
• Kubernetes (K3s, Rancher, EKS, or equivalent) in production including air gapped environments.
• Experience with OpenShift, OpenStack, or equivalent private cloud platforms.
• Go programming experience - highly regarded for tooling and automation.
• Experience with NBN integration, BNG, provisioning APIs, ONT/GW activation flows, Anycast/BGP routing, Cisco/Nokia equipment.
• Experience operating geographically distributed, multi site infrastructure.

What's in it for you?

• Competitive remuneration and employee discounts. Make life easier (and more affordable) with $80 monthly credit and 25% off Optus products and unique shopping discounts with our retail partners.
• Flexible working arrangements with opportunities to work three days in the office, two days remote or home.
• Vibrant and collaborative office campus that includes cafés, convenience store, chill out zones, GP, post office, gym, and on site childcare centre.
• Competitive leave policies, including additional "Connected" days to focus on culture, family, health, community, or whatever's important to you.
• We support growing families with inclusive, carer neutral paid Parental Leave of up to 16 weeks.
• Direct your own development and build future ready skills with Optus U's industry focused micro credentials, developed with La Trobe and Macquarie Universities.
• Build meaningful connections through employee led networks and diversity initiatives including Culture Connect, Elevate Women, Disability Network and Express Yourself (LGBTQIA+).
• Put your wellbeing first with free access to counselling and support services, 24/7 - in person, by phone, SMS, or video.

At Optus, we are strengthened by others and that means valuing diversity and saying 'yes' to embracing individual differences. We are committed to ensuring that our application process provides an equal employment opportunity to all job seekers, including individuals from diverse gender, cultural and linguistic backgrounds, individuals with a disability, individuals identifying as being part of the LGBTQIA+ community, individuals who may have served in the armed forces or who identify as Aboriginal and/or Torres Strait Islander. We also want to do our best to make our recruitment process inclusive. If you require any adjustments or accessibility support to participate fairly and equitably in the recruitment process, please email or call . We're here to help. When you contact us, please advise your preferred method of contact and we will be in touch within 48 hours.