Location: Sydney, Australia

About the Company

A rapidly growing technology organisation is building next-generation AI infrastructure and cloud platforms across APAC and is looking for a Principal Network Architect to lead the design and evolution of its national and international backbone network.

This is a highly strategic technical role focused on building a scalable, resilient and vendor-neutral connectivity architecture across terrestrial fibre, subsea networks, optical transport, IP backbone and data-centre interconnection.

You will work closely with carriers, fibre providers, subsea operators, data centres, technology vendors and internal engineering teams, acting as a key technical authority for backbone architecture and connectivity strategy.

Key Responsibilities

- Own the architecture and technical direction of the national and international backbone network.
- Design and evolve terrestrial fibre, subsea, optical and IP backbone infrastructure.
- Define network standards, reference architectures and reusable design patterns.
- Ensure high levels of resilience, route diversity and SRLG protection.




- Lead technical evaluation and selection of carriers, subsea providers and network vendors.
- Develop technical requirements, RFPs and vendor evaluation criteria.
- Provide technical assurance across design, delivery, migration and operational readiness.
- Lead complex network changes, migrations and cutovers.
- Work closely with Network Engineering, Data Centre and Operations teams.
- Mentor senior engineers and contribute to long-term connectivity strategy.
- 10+ years' experience designing and operating large-scale backbone networks.
- Principal/Lead Architect or Distinguished Engineer-level experience.
- Background within a carrier, hyperscaler, cloud, data-centre or AI infrastructure environment.
- DWDM / OTN / coherent optics
- 100G / 400G / 800G
- IP/MPLS & Segment Routing
- EVPN & traffic engineering
- SRLG and network resilience
- Experience working with carriers, fibre providers, subsea operators and major network vendors.
- Solid architecture, technical assurance and stakeholder management skills.

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📌 Principal Network Architect (Sydney)
🏢 Hamilton Barnes
📍 Sydney