Network Test Engineer RAN

n our world things change by the millisecond
We build the technology that creates amazing moments and better connects our customers. Ready to play your part Join us and Be Phenomenal. Working towards the same shared goal of better connectivity our tech teams enjoy a high degree of freedom. We love hearing ideas and seeing them come to life. With great resources youll get to be part of a team at the foundations of the transformation of our business. Who knows what the next innovation will be Thats what makes a career at Three so exciting.

Since we set foot in Ireland weve done things differently
Investing in infrastructure we built a network that now connects 2.2 million customers nationwide carrying more data than all alternative telecommunications providers combined. We take the script and rip it up were a big-hearted energetic bunch striving for a better connected life. We encourage our employees to face their weaknesses to really open themselves up to new tasks and projects in a super-charged and rich learning environment. We want you to become the best version of yourself.

Join us as Network Test Engineer RAN
This position resides in the Three Ireland Networks Test Team; a team which is accountable for ensuring the delivery of all Mobile Core Network (MCN) testing (Voice Messaging & Data Services RAN IP Service Control and VAS). The primary focus of this role is managing the Test Lab RAN environment ensuring stability and availability to support testing across the MCN.

As a Network Test Engineer you will work alongside a team of experienced engineers tasked with the continued evolution of the Three Ireland mobile network. Collaboration with multi-disciplinary experts across network design solutions & operations with the goal of delivering first class customer experience on voice data & messaging services.

The Network Test Engineer position reports to the Networks Test Manager and offers the successful candidate a fantastic opportunity to learn and develop rapidly within a fast paced dynamic environment with exposure to a full end-to-end mobile network.

• The suitable candidate will have a strong background in mobile RAN networks combined with a good understanding of testing frameworks and principles.
• As a Test Engineer you will be hands-on across a wide range of Network equipment and technology contributing to a wide array of solution introductions and existing mobile network validations:
• Manage and drive all RAN related testing. Design execute and maintain test plans for Radio Access Network (RAN) features across 2G/3G/4G/LTE and 5G NR mobile networks.
• Perform functional regression interoperability and performance testing on RAN nodes such as gNodeB/eNodeB/BTS DU CU RNC BSC and associated interfaces.
• Validate mobility procedures including handovers cell reselection carrier aggregation SRVCC and VoLTE scenarios.
• Analyse network logs protocol traces and KPIs using tools such as Wireshark TEMS QXDM or vendor-specific tracing platforms.
• Conduct lab testing to verify radio coverage throughput latency and network stability under varying traffic and mobility conditions.
• Troubleshoot and isolate issues related to RF performance signalling failures call drops attach failures and data session interruptions.
• Collaborate with RAN design core network transport and operations teams to reproduce debug and resolve network defects.
• Automate test execution and reporting using scripting languages such as Python Bash or automation frameworks integrated with CI/CD pipelines.
• Prepare detailed test reports defect documentation and validation summaries for customer acceptance and release sign-off activities.
• Ensure compliance with 3GPP standards operator requirements and vendor specifications during feature validation and network integration activities.

The skills were looking for:

• The successful candidate should be competent in all aspects of RAN technologies with previous testing and integration experience.
• They must be motivated and driven with a proven ability to work in both a team environment and autonomously.
• Educated to degree level in an Engineering / Telecommunications discipline or equivalent experience
• RAN site and controller integration experience essential (Ericsson preferably)
• Hands-on experience with physical RAN lab setups and integration including cabling rack installation power connections antenna/RF path configuration test UE setup and coordination of lab infrastructure for end-to-end network testing.
• Strong knowledge of RAN architecture protocols and procedures based on 3GPP standards.
• Experience with RAN testing tools and log analysis platforms such as TEMS Wireshark Nemo or vendor-specific OSS tools.
• Understanding of RF concepts including propagation interference handovers carrier aggregation MIMO and beamforming.
• Hands-on experience troubleshooting network issues related to call setup failures dropped calls mobility and data performance.
• Familiarity with interfaces and signalling protocols including S1 X2 NG SCTP GTP and RRC.
• Ability to develop and maintain test automation scripts using Python Bash or similar scripting languages.
• Experience working in lab and field test environments with telecom equipment from vendors such as Ericsson Nokia Huawei or Samsung.
• Strong analytical problem-solving communication and documentation skills with the ability to work in cross-functional engineering teams.

Nice to Have

• Knowledge of Mobile Core and RAN Network architectures
• Linux System Admin experience
• Project and Design lifecycle understanding

Benefits of Working at Three

• Flexible working with our new Hybrid model our employees will enjoy more flexibility working from home and our office locations (3 days per week office based). Please see job description for the office location of this role.
• Competitive salary annual performance bonus & pension contribution
• 25 days holidays plus 2.5 company days
• Annual Leave buy or sell (buy or sell up to 5 days AL each year)
• Healthcare Insurance through our flexible benefits programme
• Life assurance phone & laptop subsidized canteen
• Access to learning & development tools such as Coursera
• Free on-site parking

Theres a lot more to us than meets the eye.
You may think you know us but were full of surprises. Intrigued Join us andBe Phenomenal.
Apply now at: #Jobs

At Three we are committed to equity diversity and inclusion. As Irelands largest mobile telecommunications provider we provide a better connected life for our diverse customer base and want our teams to reflect this. We welcome and celebrate all identities and strive to create a culture of belonging where employees can thrive as their authentic selves. If you do not tick every box in this job description you likely have other valuable skills that would make you a great fit for one of our teams. If you feel this role is for you then please apply! #Jobs

If you require reasonable adjustments for your interview please let us know when scheduling your interview or alternatively please email Apply now at Three a Phenomenal career awaits!

Required Experience:

IC