Flint UK Technology Services

Mobile Core- Design Engineer Purpose of the Role Responsible for the design, evolution, testing, and capacity planning of core voice signalling platforms across 2G, 3G, 4G, IMS, and 5G networks. The role supports network transformation initiatives, ensuring robust, secure, and scalable signalling solutions that meet business and operational requirements. Key Responsibilities Design and support core voice network signalling platforms, including IP STP, DRA/DEA, DSC, IMS, and Legacy voice core nodes. Produce High-Level Designs (HLDs), Low-Level Designs (LLDs), Statements of Requirements (SoRs), and capacity models. Develop and support automated testing capabilities for 5G Standalone (5GSA) and Legacy network call flows. Assess network evolution impacts and define technical requirements for vendors and suppliers. Review supplier Statements of Compliance (SoCs), Statements of Work (SoWs), quotations, and operational procedures. Ensure all solutions comply with security, fraud prevention, and operational standards. Contribute to 1-3 year signalling technology roadmaps covering hardware, software, capability, and capacity planning. Provide technical leadership and design guidance to projects, third parties, and cross-functional teams. Technical Skills & Experience Strong knowledge of mobile core networks (2G/3G/4G/IMS/5G). Expertise in signalling protocols including SS7, SIGTRAN, SIP, Diameter, and MAP. Understanding of telecom standards, traffic engineering, switching technologies, and radio principles. Experience in network design, capacity planning, automation, testing, and vendor management.

Role Specification: Test Automation & Performance Engineer Key Skillset and Responsibilities: VoIP Performance Testing: Hands-on experience with SIP/VoIP call performance testing tools such as SIPp, Spectra, WinSIP, and StarTrinity . Ability to design, execute, and analyse large-scale call performance scenarios. Automation Development: Proficient in Python and Robot Framework for test automation. Experience developing and maintaining automated test suites across multiple domains (API, GUI, performance). API Testing & Performance Engineering: Skilled in API test automation and load testing using tools like Locust, BlazeMeter/Taurus, k6, Newman, and JMeter . Capable of designing scalable test strategies for API and system-level performance validation. GUI Test Automation: Strong understanding of Front End automation using TestCafe, Robot Framework, and Selenium . Familiar with browser automation best practices and test stability optimization. Continuous Integration & Delivery (CI/CD): Experience integrating automated tests into CI/CD pipelines for continuous validation. Familiarity with common CI/CD tools (eg, Jenkins, GitLab CI, Azure DevOps). Infrastructure & Automation Tools: Working knowledge of Ansible and Terraform for Linux-based environment setup and infrastructure automation. System Administration: Basic Linux and Windows administration skills, including environment configuration, log analysis, and troubleshooting.