Voice Engineer

About the Opportunity

We are seeking an experienced Voice Signalling Design Engineer to join a high-performing telecommunications team on an initial 6-month contract.

This is an exciting opportunity to play a key role in the design, evolution, and optimisation of core voice network platforms, supporting both next-generation and legacy mobile network technologies.

You will work on critical signalling and voice core infrastructure, helping shape the future roadmap of the network while supporting ongoing transformation initiatives.

Key Responsibilities

• Signalling & Core Network Design
• Produce signalling design requirements across core voice network platforms.
• Support service design activities across Voice Core environments, including: IP STP DSC (DRA & DEA) IMS Legacy Core Voice Network Nodes
• Contribute to the design, enhancement, and optimisation of signalling infrastructure.
• Mobile Core & Signalling Expertise
• Apply strong technical expertise across: 2G, 3G, 4G LTE, and IMS networks SS7 SIGTRAN SIP Diameter MAP
• Utilise a detailed understanding of: Telecommunications standards Traffic engineering Switching technologies Radio network principles
• Test Automation & Network Validation
• Support the development of automated testing capabilities across: 5G Standalone (5G SA) Legacy Voice Network Platforms
• Collaborate with Core Test teams to automate call-flow testing.
• Improve testing efficiency, coverage, and delivery speed through automation initiatives.
• Network Design & Capacity Planning
• Produce High-Level Designs (HLDs) and Low-Level Designs (LLDs).
• Perform: Capacity planning Network dimensioning Traffic modelling End-to-end impact assessments
• Ensure all designs meet: Security requirements Fraud prevention standards Operational readiness criteria
• Vendor & Stakeholder Management
• Engage with vendors, TSA teams, and internal stakeholders throughout the project lifecycle.
• Support network evolution programmes by: Assessing technical impacts Producing Statements of Requirements (SORs) Reviewing Supplier Statements of Compliance (SoCs)
• Work closely with suppliers to: Validate Statements of Work (SOWs) Review commercial quotations Assess implementation and operational plans
• Network Evolution & Strategy
• Contribute to the Signalling Team's 1–3 year technology roadmap.
• Provide input into: Hardware evolution Software upgrades Capacity growth planning Network capability expansion
• Analysis & Problem Solving
• Evaluate complex technical and business requirements using strong analytical skills and sound judgement.
• Balance competing priorities to deliver scalable, resilient, and commercially viable solutions.

Required Experience

• Strong experience within mobile core and voice network environments.
• Proven expertise in signalling technologies, including: SS7 SIGTRAN SIP Diameter MAP
• Strong understanding of: 2G, 3G, 4G LTE, and IMS architectures Mobile core network design Switching technologies Traffic engineering Radio network principles
• Experience supporting network transformation, modernisation, and technology refresh programmes.
• Exposure to automated testing frameworks and telecoms service validation is highly desirable.