5G Network performance engineer

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Job Title: 4G/5G RAN Performance & Optimisation Expert (ESN)

Duration: 06 months with possibility of extension

Location: London-Hybrid

Why This Role Matters Join us and play a critical role in maintaining our position as a leading UK mobile network and driving our vision to be a global top-ten network. In this role, you will directly impact our current and future network efficiency, shaping the Mobile RAN strategy and ensuring a flawless subscriber experience-particularly for the highly critical Emergency Services Network (ESN).

What You'll Be Doing

• Performance Leadership: Drive 4G/5G ESN performance management, define SLAs/KPIs, and build action plans for continuous performance uplift.
• RAN Optimisation: Lead feature and parameter optimisation trials across Nokia and Ericsson RAN, assessing network impacts and quantifying gains.
• Deep-Dive Analysis: Conduct root cause analysis of performance degradation using drive test logs, Wireshark, OSS data, and CN protocol analysis (OSI L1-L7).
• Technical Troubleshooting: Investigate and resolve systematic issues in 5G SA/NSA interworking, ESN PTT (Push to Talk) over SRTP, and overall End-to-End network performance.
• Cross-Functional Collaboration: Work closely with key SMEs, stakeholders, and 3rd-party IT/Network suppliers to deliver "fit for purpose" RAN designs.

What You'll Bring

• Expertise in Mobile Networks: Extensive experience as a Performance SME in high-availability 4G/5G/5G+ networks, with expert understanding of SA, NSA, VoNR, and Slicing architectures.
• Vendor Knowledge: Deep, hands-on experience with Nokia and Ericsson RAN counters, KPIs, and parameters.
• Protocol & Tool Proficiency: Strong knowledge of LTE/SIP signalling, SRTP/DTLS troubleshooting, and familiarity with test/post-processing tools (Nemo, TEMs, Accuver, Actix).
• Analytical Storytelling: The ability to convert highly technical data into compelling, simple-to-understand cases for change for both technical and business audiences.
• Forward-Thinking Vision: A proactive approach to network design, keeping ahead of telecom market developments and 3GPP/ETSI specifications to build the networks of the future.

Ready to shape the future of mobile connectivity? Apply today at

Randstad Technologies is acting as an Employment Business in relation to this vacancy.