Senior Technical Specialist

Optus; Sydney; Hybrid; AUD 140,000 - 190,000; Full time

Benefits offered by this job

80 AUD monthly credit

25% off Optus products

Flexible working

On-site childcare

Parental leave 16 weeks

Wellbeing support

Job summary

Optus is seeking a Senior Technical Specialist to lead the Mobile Core Signalling domain in Sydney. You will design robust, secure, and scalable signalling solutions for 3G/4G/5G, aligning roadmaps with Optus objectives to keep the network high-performing and future-ready.

You will define future-state architectures, guide development standards, and own platform lifecycle from design to upgrade. Strong leadership and stakeholder collaboration are essential to drive innovation and maintain

Qualifications

• Subject-matter expertise in Mobile Core Signalling and related platforms.
• Strong technical proficiency with architectural principles and best practices.
• Excellent analytical and problem-solving skills to translate requirements into specs.
• Strong communication and collaboration with stakeholders, platform owners and PMs.
• Demonstrated leadership with the ability to mentor teams and secure buy-in.

Responsibilities

• Develop and design technology solutions within Mobile Core Signalling, aligned with Networks architecture and business needs.
• Define future-state architecture, roadmaps, and scalable development guidelines for the domain.
• Create platform documentation covering system integration, data flows, and interfaces to OSS/BSS and upstream IT systems.
• Own the signalling platform lifecycle from design to implementation and drive roadmaps/upgrades for reliability and efficiency.
• Evaluate emerging technologies and collaborate with vendors to drive innovation and competitive advantage.
• Ensure solutions comply with Optus and industry ICT, information, and cyber security standards.

Skills

Core Signalling

Systems Design

Stakeholder comms

Leadership

Finance alignment

Job description

Optus is an Australian telecommunications company, delivering more than 11 million services to our customers every day across mobile, broadband and digital solutions.

As a Senior Technical Specialist, you will be an engineering lead within the Mobile Core Signalling domain. You will serve as the subject matter expert, designing robust, secure, and scalable systems required to support 3G, 4G and 5G signalling core solutions. By aligning platform roadmaps with Optus’ strategic objectives, you will ensure our network is high-performing, resilient, and future-ready, keeping us ahead of the curve in a rapidly evolving telecommunications landscape.

What You’ll Do

• Develop and design technology solutions within the Mobile Core Signalling domain, ensuring alignment with both Networks target architecture and business needs.
• Lead the technical evolution of your domain by defining future-state architecture, roadmaps, and scalable development guidelines to inform team decision-making.
• Create platform documentation covering system integration, data flows, and interfaces to OSS/BSS and Upstream IT systems.
• Own the signalling platform lifecycle from design to implementation, drive platform roadmaps and upgrades and ensuring operational efficiency and reliability.
• Evaluate emerging technologies, assess their application within the domain, and collaborate with vendors to drive innovation and competitive advantage.
• Ensure all solutions comply with Optus and industry standards, including ICT, information, and cyber security strategies.

What You Bring

• Subject‑matter expertise in the Mobile Core Signalling domain
• Strong technical proficiency and a solid grasp of relevant platforms, tools, architectural principles, and best practices.
• Exceptional analytical and problem‑solving skills to translate complex business requirements into robust technical specifications and solutions.
• Excellent communication and interpersonal skills, with a proven ability to collaborate with and influence stakeholders, platform owners, and product engineering managers.
• Demonstrated leadership capabilities with the ability to provide strategic consultancy, mentor technical teams, and secure buy‑in across the organisation.
• Experience driving commercial and operational alignment, including mapping corporate finance forecasts, supplying service costings, and maintaining product roadmaps.

The good stuff…

• 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 cafes, 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.
• 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.
• Free Optus bus from Macquarie University Metro Station (every 6-8 minutes); morning and afternoon.

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 ***************@optus.com.au or call 1800 309 ***.

For more information on Diversity, Inclusion & Belonging at Optus, please visit https://www.optus.com.au/about/inclusion-diversity