Job Description
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Key Information
Job title: Senior IT Network Assurance Engineer
Salary: £70,000 - £75,000 plus fantastic benefits Grade: Band 3
Contract type: Permanent Reference: 5654
Team: Service Owner - Networks and Hosting Directorate: TfL Corporate
Contract details: TfL Location: Pier Walk, North Greenwich / Hybrid
Application closing date: Thursday 1st October 2026
All offers of employment are subject to satisfactory right‑to‑work checks. Candidates must be able to demonstrate their right to work in the UK. At the present time TfL is unable to offer visa sponsorship for this role.
Hybrid working within this role enables a balance of 50 per cent of time split between the office and home over a 4-week period. Hybrid working arrangements can evolve subject to business requirements.
Key Technologies: Routing and Switching (WAN/LAN/Datacentre), SDN (Software Defined Networking), Network Security (Firewalls), Wi-Fi, Network Monitoring/Management Tools, and Cloud Networking.
About Us
The Networks and Hosting Team, which sits within Technology Products and Operations is responsible for maintaining existing infrastructure, which underpins the majority of our services across TfL.
It is an exciting time to join the Network team, as you’ll be working on large scale network improvement projects such as: network security (firewall) upgrades, network consolidation and upgrades, WAN refreshes, data centre network refresh.
About the Role
The Senior IT Network Assurance Engineer reports to the Network Assurance Manager and provides specialist technical knowledge, experience and leadership to assure, support and optimise our IT Access, WAN, data centre and Cloud network infrastructure.
Working within a 24/7 operational environment the Senior IT Assurance Engineer will be maintaining technologies, assuring deployments, and looking for continuous improvement and automation of repeatable tasks.
You will have an in depth very high level knowledge of networking technologies including routing and switching across campus and datacentre, and network security (inc. firewalls), and will be leading Network Assurance team members, and collaborating with our Network Transformation Portfolio, Infrastructure teams, Product Managers, Network Architects, Cyber Security specialists, and our Application Support and Development teams to provide expertise to support our business-critical services and deliver high profile projects in line with our organisation priorities and vision.
Main Duties
- Ensure the operability of TfL's information technology networks including management, investigation and resolution of incidents, and root cause analysis, to maximise system availability for critical business services in accordance with the agreed service levels.
- Accountable for the technical ownership and assurance of all operational network activities, including change, request and network design architectures, ensuring networks are in line with approved designs, and implementations are fit for purpose.
- Provide guidance and technically lead and mentor the Network team in the delivery of: BAU Services, Project work activities, Continual improvements to both processes and service.
- Respons