MCX Test Engineer

MCx / 5G / LTE Testing Contractor – 9 Month Contract

Location: Cambridge – Onsite

Duration: 9 months

My client is looking for an experienced Telecoms Test Engineer to support a 9-month project focused on the testing and validation of Mission Critical Communications (MCx) services across 4G/LTE and 5G networks.

The role will involve hands-on, end-to-end manual testing of MCx user call features, working across the relevant mobile, IMS and signalling environments.

Key Responsibilities

• Execute end-to-end manual testing of MCx user call features and services.


• Test 4G/LTE and 5G-based communications and associated functionality.


• Perform testing across IMS and SIP-based environments.


• Analyse network and signalling logs to identify issues and support troubleshooting.


• Execute test cases, document results and raise defects where required.


• Work closely with engineering and development teams to investigate and resolve issues.


• Support testing against relevant telecoms standards and specifications.

Required Skills & Experience

• Strong hands-on experience with 4G/LTE and/or 5G testing .


• Good understanding of IMS and SIP .


• Commercial experience with MCx / Mission Critical Communications , particularly MCPTT or related services.


• Strong background in manual telecoms testing and validation .


• Experience analysing telecoms/network traces and troubleshooting signalling issues.


• Familiarity with 3GPP specifications .


• Experience with Wireshark and telecoms log analysis.


• Experience using Valid8 or similar telecoms testing platforms.


• Knowledge of RTP/RTCP, Diameter or related IMS protocols.


• Experience testing MC-PTT, MC-Video or MC-Data.


• 9-month initial contract.


• £45–£55 per hour , depending on experience.