E2E Principal Architect, Core

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

The E2E Network Architect – 5G Core works across agile business, IT, network, and vendor teams to provide end‑to‑end alignment, strategic guidance, governance, and risk management for major Optus network initiatives. The role represents Optus in government, industry, and technical standards discussions while applying multi‑technology expertise, technical leadership, and strategic thinking to design and manage robust network solutions. Its primary focus is leading end‑to‑end solution architecture for the Optus Mobile and Fixed core, reporting directly to the Director of Network Architecture.

What You’ll Do

• Contribute to long‑term network strategy development aligned with organizational goals and growth plans.

• Assist in designing 5G Core (Fixed and Mobile) architecture blueprints aligned with Optus’ long‑term strategy, technology roadmap, and industry best practices.
• Support the development and enforcement of network policies, standards, and procedures to ensure regulatory and industry compliance.

• Provide technical guidance and leadership to Domain Architects and Engineers.

• Ensure integration and interoperability across mobile, fixed, and cloud architectures with high availability and performance.

• Present architectural plans, reports, and proposals to stakeholders.

• Participate in security workshops, providing architectural input to shape network security strategy.
• Oversee the implementation of security protocols and measures by engineering and architecture teams to protect the network from cyber threats.

• Collaborate with vendors to assess new technologies, develop new features, and enhance network capabilities.

• Ensure architectural frameworks, policies, and design documentation remain accurate and compliant with international standards, security best practices, and regulatory requirements.

• Participate in and lead initiatives within the Network Architecture Review Board, ensuring thorough review processes and follow‑up actions through to final approval.

What makes you perfect for the role?

• Strong experience in telecommunications engineering, with deep knowledge of PSTN, carrier‑grade networking, and telecom technologies.
• Extensive carrier‑level design experience, including regulatory requirements, market trends, and technical specifications across fixed, mobile, and data networks.
• Hands-on experience with New Technology Introduction (NTI) in carrier environment.
• Expert knowledge across: 5G (NSA/SA), IMS, CNF, NFVi, Voice over NBN, VoLTE, VoWiFi, Fixed Telephony (TDM), Mobile 3G/LTE, SMSIP PBX, SBC, VMware, WebRTC & RCS.
• Lead convergence across VoLTE, VoNR, VoWiFi, Fixed Voice SIP, and legacy interworking to PSTN/SS7.
• Understand Fixed Voice evolution: Softswitch migration, SIP trunking, number portability, emergency services compliance.

• Proficient in architecture, design, implementation, and specifications for: 5G & 4G Mobile Network Architecture and Design, VoLTE / VoWiFi / VoNR / IMS, RAN & 3GPP standards, Orchestration & CI/CD, Cloud architecture (virtualisation, containerisation, microservices, NFV, Kubernetes, Docker, IaaS/SaaS/PaaS),FMC (Fixed‑Mobile Convergence) design, LAN/WAN/VPN,SMS/MMS platforms, Intelligent Network (SCP/STP/SSP),NBN residential features, RCS, multimedia & video services, CCS7 and SIP protocols.

• Drive evolution from EPC (MME/SGW/PGW) to 5G SA including interworking (N26, EPS Fallback, VoLTE/VoNR continuity).

• Strategic planning, cross‑functional leadership, and organisational alignment.
• Risk analysis, Voice/SMS Fraud remediation planning, and mitigation execution.
• Knowledge of regulatory requirements, privacy, and fair‑competition practices.

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 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.
• 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 AccessibleRecruitment@optus.com.au or call 1800 309 170. 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 https://www.optus.com.au/about/inclusion-diversity