Senior Technical Specialist

At Optus, we don't sit back and let the future happen to us - we're out there making it. By expanding into new technology and relentlessly improving every day, we're creating a better tomorrow for all Australians.

We are seeking a highly skilled Technical Project Prime and Subject Matter Expert (SME) to join our Mobile Core & Services Engineering (MCSE) business unit in Group Networks, based in Macquarie Park, Sydney.

The day to day

• Act as technical project prime and SME with specific focus on SBC systems / IMS architecture, and other relevant technology area across multiple technology domains.
• Be responsible for all technical components around network design of the project including the scoping, design, testing, documentation and all steps required for the successful implementation in the production network.
• Specify, define, and document design processes, standards and practices related to the signalling/switching/data network to ensure engineering best practices are maintained.
• Creation of technical training material and delivery of training / presentation to both technical and non-technical audiences.
• provide recommendations concerning technical solutions and designs for signalling / switching / mobile data network.

Why you are our next Senior Technical Specialist

• Expertise in IMS/SBC solutions, especially containerized Nokia IMS/SBC and Ericsson IMS.
• In-depth knowledge of SBC/IMS/VoLTE architecture and use cases.
• Familiarity with IETF and 3GPP standards for media services, SBG signalling, and networking.
• Experience with Nokia Cloud Native Communication Suite (CNCS) (both control and media plane) and containerised networks.
• Strong understanding of Mobile Network Core design, signalling flows, and protocols (SIP, H.248, Diameter, HTTP(S), SIPREC, IPsec, TLS, RTP, DTMF, SIGTRAN, etc.).
• NFVI knowledge, with Openstack and Ericsson product knowledge being advantageous.
• Containerization and orchestration skills (Kubernetes, Openshift, AWS, Openstack, VMware clouds).
• Experience with HLD/LLD creation, configuration, integration, and acceptance testing.
• Proficiency with DevOps tools (Gitlab, IaaC, Ansible).
• Ability to collaborate with engineering, product, and architectural teams.

What's in it for you?

• 3 days in the office, 2 days remote – with flexible hours to suit
• Inclusive gender neutral paid Parental Leave of up to 16 weeks
• Competitive leave including 2 additional 'Connected Leave' days
• All Optus employees have access to resources, webinars and support via the 'Parents at Work portal'
• Own your own growth by accessing an extensive online and facilitator led learning catalogue.
• Connect at work through our employee-led volunteer groups: Culture Connect, Elevate Women, Disability Network, Express Yourself (LGBTQIA+), United Veterans, Yarn Network, Wellbeing Network and Young Professionals.
• Vibrant campus life, variety of facilities including restaurants, cafes, gymnasium, GP, and post office
• Free Optus bus from Macquarie University Metro Station (every 6-8 minutes); morning and afternoon

Keen to see what it's really like to work at Optus? Search #OptusLife on LinkedIn to go behind the scenes

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.

For more information on Diversity, Inclusion & Belonging at Optus, please visit