Mobile/Voice/Core Signalling Designer
Reading - 2 days on-site, 3 days WFH
580 per day Inside IR35 - rate to umbrella
Initial 6-month contract, view to extend
Overview
PCR Digital is working with a leading telecoms organisation who are undertaking a major Voice Core and Subscriber Data Management transformation programme. They are seeking an experienced Mobile Core Signalling Designer with strong Ericsson signalling platform expertise and Nokia SDM experience to support the design and delivery of critical core network evolution initiatives. This is a highly technical design-focused role, requiring hands‑on experience producing high-level and low-level design documentation (HLD / LLD) and supporting complex core network migrations, integrations, and service deployments.
Key Responsibilities
Signalling Architecture & Migration
* Produce High-Level and Low-Level Design documentation for core signalling platforms
* Design and support migration of signalling nodes from bare metal to cloud-based environments
* Work with Ericsson DSC Signalling Controller (5G compliant)
* Support IPSTP consolidation and virtualisation initiatives
* Design traffic migration strategies, new instance builds, and network integrations
Subscriber Data Management (SDM)
* Support migration programmes retiring Ericsson HLR/HSS platforms
* Design solutions to migrate subscriber profiles onto Nokia SDM
* Understand and map subscriber data flows, service dependencies, and associated risks
Nokia SDM Transformation
* Support the transition from VNF-based deployments on vendor virtualisation stacks
* Contribute to the target architecture of CNF deployments on internal private cloud platforms
* Work closely with Nokia vendor teams on solution design and migration approaches
Essential Skills & Experience
Ericsson Platforms
* Ericsson DSC (Diameter Signalling Controller)
* Ericsson IPSTP
* Experience working with HLR and HSS platforms
Nokia Platforms
* Nokia Subscriber Data Management (SDM) experience
* Experience working with VNF and/or CNF architectures
* Exposure to subscriber migration programmes (vendor‑to‑vendor or platform migrations)
Core Network Expertise
* Strong knowledge of mobile signalling protocols
* Experience with Diameter routing and signalling systems
* Proven core network design experience
* Experience designing traffic migration and service integration solutions
* Ability to independently produce detailed HLD and LLD documentation
Ideal Candidate
* Strong technical signalling design experience within mobile core networks
* Experience working in large‑scale telecom network transformation programmes
* Comfortable working independently and collaborating with vendors, engineering teams, and programme stakeholders
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