BT Group
Test and Integration Engineer - ESN
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Test and Integration Engineer – ESN
[Req ID: 56119] Job Function: Software Engineering Posting Duration: 25/06/2026 – 06/07/2026 Division: Networks Location: Bristol, UK (with frequent travel across the UK required)
Salary: Competitive, plus benefits
Why this job matters
This critical role supports the successful integration of new systems, products, services, and validation campaigns to ensure the quality of deliveries for BT/EE’s Emergency Services Network (ESN) and its customers.
About the ESN
BT and EE’s Emergency Services Network (ESN) marks a global strategic priority. ESN will be the world’s most advanced communications network for emergency services, enhancing reliability, coverage, and resilience to:
- Replace Airwave infrastructure
- Deliver critical voice, data, and video services for 385,000 users (police, fire, ambulance)
- Extend 4G/5G reliability for both commercial and emergency dependencies
- Save lives and protect millions across Britain
You’ll work in a growing on-shore team, leveraging your deep technical expertise in LTE/5G, RAN, Cloud Core, IMS, or applications to champion test and integration quality. Your rigorous end-to-end testing will align with TMMi and ISTQB standards, and you’ll advocate for quality across BT Technology and external stakeholders.
Note: This role requires National Security Vetting (SC or NPPV clearance).
What you’ll be doing
- Plan and execute:
- Design test cases and support test plan development, embedding automation where possible.
- Execute end-to-end integration testing across Reference and Production environments.
- Champion Quality Assurance:
- Advocate for test principles and standards, engaging technical and non-technical partners.
- Underpin evidenced decision-making based on service quality, safety, and operational risks.
- Troubleshoot and resolve:
- Report test results/issues via formal defect management processes.
- Collaborate with suppliers, Home Office teams, and emergency services.
- Execute validation testing:
- User Acceptance, Operational Acceptance, performance, failure recovery, and live validation.
- Facilitate secure progress:
- Communicate evidence-based test risks to challenge and inform progress, including when releases may not proceed.
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Requirements
Essential Qualifications & Experience
Experts expected in LTE/5G core or RAN domains with cross-functional knowledge. Recognised expertise and hands-on experience in:
- Technical deep dive:
- Core Call Flows (EPC/5GC architecture) or RAN (radio protocols, interworking).
- Detailed logging/ signalling analysis for UE/RAN/Core/SBI interactions.
- Protocols: RRC, PDCP/RMAC/SBI/Diameter, GTP-U, HTTP/2.
- Network-wide QoS, latency, mobility, and fault propagation (e.g., congestion, failover).
- Took debugging further:
- Deep Wireshark/Xcap/expert trace tools (root cause : design/config/integration/interface issues).
- ** knows when to say ‘hang fire’:**
- Confidence to question (and escalate) traps e.g. obstruction-free design flaws or standards ambiguities.
- Risk-mitigation experience in hazardous scenarios (edge cases, go-fail).
- Real-world Hybridization:
- 4G/5GSA RAN (letta Ericsson/Nokia), preferably Ericsson Cloudcore.
- Wiring Toolchain:
- Hands-on with RAN logging, Diameter, Core/SBI/NG1/Xn/protocol tracing.
- End-user behavioural storyboards (UE to inter-service flows).
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Critical Mindset
- Drive evidence-based decisions: Constructively raise objections for safer test coverage.
- Vendors across domains: Engage safely with HUAWEI/ZTE/H3C profiling studies.
Required Skills
- Test Planning and Test Management
- Protocol Expertise (RRC, GTP/U, NG/Xn)
- Protocols: Diameter, (implicitly) HTTP/2
- Diagnosis/ Triage (traces, logs, RAN signalling)
- IRT/risk Analysis and decision-making baselining
Our Package
Tailored benefits supporting growth, wellbeing, and lifestyle. Core and optional benefits available:
Core Package:
- Bonus: 10% of salary target
- On-demand telehealth: 24/7 private GP access, including family members.
- Carers’ Leave: Up to 2 weeks paid (market-leading).
- Parental Leave equity: 18 weeks full pay, 8 weeks half pay.
- Discounts: EE/BT products (mobile, broadband).
- Pension: 5% of salary (contributing 10%, us covered 5%).
- Holiday savings: Purchase scheme.
Select Optionals:
- Healthcare and dental enhancements.
- Gym subscriptions or wellness perks.
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