Senior Network Engineer (Voice & IPX)

Job Summary

As a Senior Network Engineer (Voice & IPX), you’ll help shape the future of Telstra’s international mobility, voice, and interconnect capabilities.

This individual contributor role is responsible for ensuring Telstra’s international network delivers a reliable, high-quality experience for interconnect and roaming partners, suppliers, and customers. You’ll contribute to the analysis, architecture, design, development, deployment, and optimisation of network technologies, with a strong focus on interoperability across multiple network domains.

You’ll drive technology evolution across Telstra’s International Core Voice, IPX, and Mobility/Roaming platforms, delivering scalable and resilient solutions supporting international voice, mobility and roaming services, signalling platforms, and specialised international network services.

Your focus will span the infrastructure, virtualisation, orchestration, application, IP network, and security layers, including:

• Oracle DSR, Ribbon SBC and PSX, and A2P SMS applications
• Cisco and Juniper switching and routing
• Check Point firewalls and network security
• NFV, cloud-native architectures, orchestration, and automation

You’ll provide technical leadership in delivering innovative, next-generation network solutions that improve service quality, operational efficiency, resilience, and Telstra’s position in the global mobility and interconnect landscape.

What We Offer

• Performance-related pay
• Access to thousands of learning programs so you can level-up
• Global presence across 22 countries; opportunities to work where we do business.
• Purchased annual leave scheme
• Additional Telstra day off
• Additional 30% off Telstra products and services
• Toolkit provided (laptop + mobile phone + plan paid for)

What You’ll do

• Design, develop, deploy, and optimise solutions across International Voice, IPX, Mobility, and Roaming networks.
• Drive network transformation through NFV, cloud adoption, automation, and software-defined networking.
• Deliver secure, scalable, high-performing interconnect and roaming solutions.
• Provide specialist expertise across signalling, voice, IPX, roaming, and interconnect, ensuring integration with adjacent network technologies.
• Support Cisco and Juniper switching and routing infrastructure across the International Voice and IPX networks.
• Manage Check Point firewalls and network security controls, ensuring compliance with Telstra security policies and standards.
• Manage deployment, configuration, and lifecycle of Oracle DSR, Ribbon SBC and PSX, and A2P SMS platforms.
• Manage and support the infrastructure, virtualisation, and orchestration layers hosting International platforms and applications.
• Collaborate with internal stakeholders, international partners, customers, and vendors to deliver strategic network capabilities.
• Lead troubleshooting and resolution of complex network issues to maintain service availability and customer experience.
• Manage hardware and software currency, security patching, resiliency assessments, and sustainability requirements.
• Produce and review High Level Designs, test plans, and Methods of Procedure, and execute changes under Telstra change governance.
• Contribute to network strategy, technology roadmaps, architecture standards, and continuous improvement.

Your Technical Expertise

You’ll bring strong knowledge and experience across:

• Voice & IPX: Softswitches, Ribbon SBC, Ribbon PSX, Media Gateways, Oracle DSR, Oracle/Tekelec EAGLE STP, DNS/ENUM, A2P SMS
• Protocols: VoIP, SIP, TDM, IPX, Diameter, SS7/SIGTRAN, LTE, 3G/4G/5G, VoLTE/IMS
• IP & Security: Cisco and Juniper switching/routing, IP/MPLS, VLAN/VRF, BGP/OSPF, Check Point firewalls, network segmentation, signalling and interconnect security
• Virtualisation & Orchestration: Red Hat Virtualisation, NFV/VNF/CNF, cloud-native platforms, orchestration and automation tooling
• Network Domains: International Core Voice & IPX, Voice & IPX Signalling, Mobility & Roaming, Wholesale Voice, OTT Voice
• Monitoring & Assurance: Traffic Management Systems, Real-Time Traffic Monitoring, Genview Analytics, Performance Intelligence Centre, Splunk, Grafana, Inventory Management
• Lifecycle Management: Hardware and Software Currency, Security Patching, Resiliency and Sustainability Concepts and Management

About You

• Bachelor’s degree in Telecommunications Engineering or a related discipline, or equivalent relevant technical qualifications.
• Minimum 8 years’ relevant experience in voice, signalling, IPX, and/or mobility/roaming network engineering.
• Strong understanding of international Voice, IPX, Mobility/Roaming, and carrier interconnect requirements.
• Hands-on experience with Oracle DSR, Ribbon SBC and PSX, and A2P SMS platforms, including deployment and management.
• Experience configuring and supporting Cisco and Juniper switches and routers in carrier-grade environments.
• Experience managing Check Point firewalls and network security controls.
• Sound knowledge of virtualisation, NFV, cloud-native architectures, and orchestration platforms.
• Sound understanding of SIP, Diameter, SS7/SIGTRAN, and IP networking protocols.
• Experience as a technical lead on medium to large engineering projects, preferably across voice or mobility networks.
• Ability to review technical solutions, conduct impact analysis, and plan controlled implementations.
• Strong analytical, problem-solving, and root-cause analysis skills.
• Excellent interpersonal, vendor, and stakeholder management skills.
• Certifications such as CCNP, JNCIP, Check Point CCSA/CCSE, or Red Hat will be highly regarded.

Who You’ll Work With

Internally, you’ll work closely with:

• IP, Transmission, Security, and Network Optimisation teams
• Voice Network Operations groups (TGOC) and Major Incident Management
• Product, Architecture, and Cloud/Virtualisation Infrastructure teams
• Network Resilience, Change Management, and Cyber Security teams
• Finance teams

Externally, you’ll coordinate and deliver programs under the International Voice and IPX Engineering program of works, partnering with international interconnect and roaming partners, IPX carriers, customers, and technology vendors including Oracle, Ribbon, Cisco, Juniper, and Check Point.

Why Join This Team?

You’ll work at the heart of Telstra’s international network, combining carrier-grade telecommunications expertise with NFV, cloud-native networking, automation, orchestration, and next-generation network technologies.

It’s an opportunity to influence the evolution of Telstra’s international Voice, IPX, signalling, mobility, roaming, IP, security, and virtualisation environments while working with global partners and leading technology vendors.

 Diversity is more than a policy – it’s how we thrive

We know diverse teams deliver better outcomes, and we’re committed to creating an environment where everyone feels safe, respected, and supported — regardless of gender, background, or ability.

We strongly encourage women and gender-diverse people to apply and are happy to discuss flexible working arrangements or adjustments to the recruitment process.