Slough
This role sits within the Mission Critical Test and Certification team of a leading global tech company’s Networks Europe division. The team is driving entry into the Public Services domain across Europe. This role requires 5 days per week onsite in Berkshire office. We are looking to hire a senior telecom Core Engineer with extensive background and experience in IMS and VoLTE, any vendor (i.e. Ericsson, Nokia, Mavenit), and ideally someone who is well rounded; Design/Architecture, Testing, Integration, O&M would be preferable. As an MCX Engineer, you will work across the Test and Delivery teams under the guidance of Test and Service Delivery Managers. You’ll play a pivotal role in ensuring the performance, reliability, and availability of our solutions—meeting customer expectations, contractual milestones, and service level agreements (SLAs). Joining our team means becoming part of a group of highly skilled technical specialists who define and deliver industry-leading MCX solutions, supported by strong collaboration with colleagues across Europe and at our global headquarters. Key Responsibilities • Act as a technical expert in IMS , applying analytical skills to troubleshooting, root cause analysis, and end-to-end testing., • Provide solution expertise and guidance for MCX Client and Application Test Strategy and Test Plans across network elements and software releases., • Execute Functional, Performance, Accessibility, and Compatibility test plans., • Track and report test progress accurately within defined project timelines., • Validate test cases, upgrade procedures, troubleshooting guides, and documentation to ensure consistent and reliable test execution., • Conduct detailed analytics and fault investigations to resolve feature and performance issues within SLAs., • Provide continuous feedback and recommendations on training and development for yourself and fellow engineers., • Execute MCX Client porting and verification testing to support R&D in meeting release criteria., • Produce detailed test progress reports and performance logs., • Manage trouble tickets through to resolution, ensuring comprehensive documentation for R&D investigation and implementation of recommendations., • Offer technical support during Sandbox testing, providing analysis, feedback, and logs to third parties for solution development or integration. What We’re Looking For • Strong background in 4G/5G Core technologies, particularly Voice, Video, and Data services for users and applications., • Deep expertise with MCX Client applications and SDK solutions on Android (GMS, non-GMS, Android Go), iOS, Linux, and Windows OS., • Proficiency with LTE testing tools (Wireshark, IXIA, Viavi, Spirent, XCAL, XCAP, QXDM, Jira, HPQC, Logcat/Putty); experience with MCPTT QCIs is a plus., • Experience in software lifecycle testing for VNF deployments on VMware., • Knowledge of client software deployment methods via OTA and EMM., • Proven ability to perform end-to-end troubleshooting for LTE and TETRA networks and call flows., • Strong understanding of 3GPP specifications and Mission Critical features., • Excellent presentation, communication, and interpersonal skills in written and spoken English., • Engineering degree (or equivalent experience) in Computer Science, Electronics, Telecommunications, or a related field., • Familiarity with GCF and other testing standards for client certification., • Flexibility to support on-call rotations as needed., • Willingness to work on-site with customers for extended project support periods. What Success Looks Like • A self-motivated, driven professional who thrives as part of a small team of test experts., • Ability to execute complex testing activities to defined project and test milestones., • Collaborative approach, working with PMO functions to report progress and address project risks effectively., • Strong and lasting working relationships with customers and partners., • Acts as the subject matter expert for deep technical investigations across end-to-end LTE and TETRA architectures., • Flexibility and reliability to support on-call duties and customer site engagements as required.