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# Test Engineer

- **Company:** Clerkenwell
- **Location:** London, UK
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Microsoft Excel, Artificial Intelligence, Automation of Tests, Unit Testing, Software Bug Management, Cloud Computing, Cloud Computing Security, Code Coverage, Data Centers, Local Area Networks, Microsoft Office, Network Architecture, Microsoft SharePoint, System Integration Testing, Wide Area Networks, Wi-Fi Technology, Network Routers, Data Processing, Performance Testing, Firewalls (Computer Science), Cisco
- **Published:** September 28, 2026
- **Apply:** https://www.apply4u.co.uk/jobs/test-engineer/48768840

## About the Role

and translate them into structured, traceable test scenarios. Advanced ALM usage: coverage modelling, traceability, defect analytics, and management reporting. Performance and conformance testing: RFC 2544, network test equipment, service management toolsets (e.g., StableNet). MANDATORY SKILLS & EXPERIENCE * Minimum 5 years' relevant experience, with demonstrably deeper hands-on telecom/network testing than the Test Engineer band. * Strong QA and test industry knowledge of standards and methodologies. * Proven test design ownership on complex infrastructure or service transition programmes. * Strong defect management, root-cause analysis, and test evidence discipline. * Excellent organisational, coordination, and stakeholder management skills, comfortable in customer-facing settings. * Proficient Excel and strong Microsoft Office, Teams, and SharePoint skills. DESIRABLE SKILLS & EXPERIENCE * Experience in customer-facing or critical infrastructure environments (CNI / National
Grid advantageous). * Test automation experience and AI-assisted test design exposure. * Experience mentoring or technically leading small test teams. * ITIL working experience. * Multi-domain breadth across three or more of the twelve domains. CERTIFICATIONS & QUALIFICATIONS * ISTQB Foundation - expected. * ITIL - desirable. * Relevant network/cloud certifications (e.g., CCNA/CCNP, cloud provider certs) are desirable

## Description

Test Plan. Comply with client security policy, data handling, and audit requirements at all times, on and off site. Attend client hubs and customer sites as required, including liaison with the wider Test team and, where applicable, the customer lab. TECHNICAL SCOPE & DOMAIN COVERAGE Testing services are delivered across the full client product and service estate: Hosting; LAN & WiFi; Data Centre; Service Transition; SD-WAN; Telephony; UC & Unity; MPN & Cloud; IoT; Fixed Connectivity; Mobility; Cloud & Security. Test phases in scope: Unit Testing, System Integration Testing (SIT), Functional Testing, Non-Functional Testing, Disaster Recovery Testing, and Operational Acceptance Testing (OAT). Deep hands-on telecom/network infrastructure testing: routers, switches, firewalls, Cisco console competence. Strong technical understanding across hosting, data centre, SD-WAN, LAN/WiFi, UC, mobility, cloud & security, and service transition. Ability to interpret complex infrastructure designs


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