CN Network and System Security Professional

Position: 21CN Network and System Security Professional
# 21CN Network and System Security Professional Job Req  Date: 4 Mar 2026

Function:
Engineering Unit:
Networks

Location:

Snowhill, Birmingham, United Kingdom Salary:
Compeititve with great benefits
** Recruiter:
Luke Byrne
**** Career Grade: E
**** Internal Closing Date: 18th March**##
** Why this job matters
** Ensuring the inherent security in BT’s architecture and services expected by our customers, and constantly appraising the risk BT faces from the wider connected world, this role assures the protection of  BT Group’s brands and reputation. As a Global Telecommunications carrier and provider, UK Critical National Infrastructure, this role’s commitment to improve Security controls within BT Critical Business operational systems is vital to maintain operation of BT’s day to day business, allowing the business to operate provision and maintain the UK BT network, Transmission, Access, Consumer and also supporting Openreach’s deployment of NGA & G.Fast

technologies for BDUK.
This role is fundamental to maintaining BT Network Management Systems Security posture, being proactive in identifying security issues and concerns and reducing risk as much as possible, whilst also being reactive when operations are threatened by issues above BT’s threat and risk appetite.##
** What you’ll be doing*
* • Provide consultancy to the business and delivery teams on 21CN DCN Network and Access Controls   
• Engage with Network, System and Platform designers as well as 3rd parties and Suppliers to discuss and enforce the security controls required to keep the business secure  
• Provide controlled, auditable and secure access to the 21CN DCN management network  
• Collaborate with other team members on managing the Firewall task tracking list, Group mailbox &process for 21CN including:

- 1) Running daily firewall task management review  calls      
2) Ensuring all tasks have an assigned owner or a known/recorded state.
3) Managing Firewall tasks through to successful completion      
4) Supporting any end-to-end diagnostics if required for trouble shooting connectivity issue  
• To act as a competent point of contact for All 21CN security matters, when dealing with 3rd parties, suppliers and other parts of the business##
** Skill and experience*
* • Understanding of Network Security firewall technologies and their uses (Checkpoint and Cisco)  
• Understanding of Data Centre Network Technologies  
• IP Networking Skills  
• Network routing and network routing protocol skills   
• Cisco/Checkpoint networking/security accreditations i.e CCNA / CCSA   
• Understanding of LINUX OS and Cisco ISE  
• Good interpersonal skills.
Nice to have:

• Knowledge of user access security (roles/privileges etc)  
• Proven strong customer facing skills.  
• Efficient problem solver in enterprise environment.  
• Ability to work as part of a team as well as under minimal supervision.  
• Time management skills.##
** Benefits*
* • 10% on target bonus  
• BT Pension scheme, minimum 5% Employee contribution, BT contribution 10%  
• From January 2025, equal family leave:  receive 18 weeks at full pay, 8 weeks at half pay and 26 weeks at the statutory rate. It’s for all parents, no matter how your family is made up.  
• Enhanced women’s health support: including help with menopause symptoms, cancer screenings, period care and more.  
• 25 days annual leave (not including bank holidays), increasing with service  
• 24/7 private virtual GP appointments for UK colleagues  
• 2 weeks carer’s leave   
• World-class training and development opportunities  
• Option to join BT Shares Saving schemes

BT Group was the world’s first telco and our heritage in the sector is unrivalled.  As home to several of the UK’s most recognised and cherished brands – BT, EE, Openreach and Plusnet, we have always played a critical role in creating the future, and we have reached an inflection point in the transformation of our business.
Over the next two years, we will complete the UK’s largest and most successful digital infrastructure project – connecting more than 25 million premises to full fibre broadband.  Together with our heavy investment in 5G, we play a central role in revolutionising…