Core Engineer - IMS

First Point Group is recruiting for an IMS Core Engineer on behalf of a global telecommunications technology provider. The successful candidate must have strong expertise in IMS technologies, end-to-end testing and troubleshooting, and deep knowledge of 4G/5G core networks. ESSENTIAL - candidates must be eligible for SC Clearance (5 years of continuous residence in the UK).

PLEASE NOTE – sponsorship cannot be provided. Candidates must live in the UK with valid rights to work.

The opportunity:

You will act as a technical subject matter expert in IMS with a strong analytical approach to troubleshooting, root cause analysis (RCA), and end-to-end (E2E) testing. The role involves defining and executing comprehensive test strategies, supporting client and application validation, and working closely with R&D, customers, and third parties to ensure high-quality IMS solutions.

Responsibilities

• Provide solution expertise and guidance for IMS client and application test strategies and test plans across all network elements and software releases.


• Execute functional, performance, accessibility, and compatibility test plans.


• Accurately track and report test progress against defined project timelines and milestones.


• Validate all supporting test cases, upgrade procedures, troubleshooting guides, and product documentation to ensure consistent test execution.


• Perform deep-dive analytics and fault investigations on feature and performance test cases, delivering resolutions within agreed SLAs.


• Provide continuous feedback and recommendations on training and development plans for yourself and other test engineers.


• Execute IMS client porting and verification testing, gathering R&D inputs to meet Sandbox exit criteria.


• Create and maintain test execution reports, performance logs, and progress documentation.


• Manage the full lifecycle of trouble tickets through to successful resolution, ensuring complete and accurate information is provided to R&D teams.


• Provide technical support for all Sandbox testing, including analysis, feedback, and log provision to third parties for solution development or system integration.

Required skills and experience:

• Strong background in 4G/5G Core technologies, particularly Voice, Video, and Data services.


• Extensive expertise in IMS client applications and SDK solutions across Android (GMS, Non-GMS, Android Go), iOS, Linux, and Windows platforms.


• Advanced knowledge of LTE testing tools, including:


• Wireshark and system log analysis (SIP, RTP, RTCP, Diameter)


• Load and performance testing tools such as IXIA, Viavi, Spirent, XCAL, XCAP, QXDM, Jira, HPQC, Logcat, Putty


• Experience with software lifecycle testing for VNF architectures deployed on VMware.


• Testing of client software deployment methods via OTA and EMM.


• Proven expertise in end-to-end troubleshooting across LTE and TETRA networks, including call flows.


• In-depth knowledge of 3GPP specifications and mission-critical features.


• Excellent written and verbal communication skills in English, with strong presentation and interpersonal abilities.


• Ability to maintain high standards of work and adapt in a fast-paced, dynamic environment.


• An Engineering degree (or equivalent experience) in Computer Science, Electronics, Telecommunications, or a related discipline.


• Awareness of GCF and other client certification testing standards.


• Willingness to participate in an on-call rota as required.


• Flexibility to work for extended periods at customer locations to support project delivery.