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.

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 (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.