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Principal Network Architect

Job Req ID:  46175
Posting Date:  30 May 2025
Function:  Architecture Solution and Design
Unit:  Networks
Location: 

Snowhill, Birmingham, United Kingdom

Salary:  Competitive with Excellent Benefits

Recruiter: Trevor Newman

Career Grade: C

Internal Closing Date: 13/06/25

 

(Our hybrid working model means you are expected to be in the office 3 days per week)

 

With over 175 years of heritage, BT is now the flagship business brand of BT Group. We’ve brought together our best people and capabilities into a B2B powerhouse serving 1.2 million business customers internationally.

We’re a global leader for secure connectivity and collaboration platforms for businesses of all shapes and sizes, from big household names and government departments, right through to sole traders and new start-ups. But it’s not just the technology that matters, it’s what it can do to help them build stronger, smarter, more secure businesses.

We value diversity and inclusion and believe in making a positive impact. We connect for good by championing digital inclusion and equipping people, businesses, and communities with digital skills to thrive.

As a member of our team, you will be part of an organisation that celebrates difference, fosters innovation and provides you with opportunities to be your best. With millions of businesses relying on us daily, joining BT means you can be part of a diverse and multi-skilled team that makes a significant impact to society.
 

Why this job matters

The BT Mobile network is currently the best performing network in the UK, according to external benchmarking 
studies. The IMS & Mobile Voice team is responsible for designing and capacity planning a network that supports 
over 30 million users across 2G, 4G, 5G, Wi-Fi & Fixed telephony.

 

A Principal Network Designer will:
• Will have the opportunity to drive and work across multiple technologies, lead the newest IMS innovations
and create cutting edge services of the future
• Will challenge the individual to be best in the industry and be ahead of the curve with competition
• Will deliver and maintain services across fixed and mobile for both Consumer and Enterprise Customer 
Facing Units
• Will be engaged in service and platform design and capacity management activities either as the Design 
lead or in a supporting role to the project or BAU work activity
• Will have the opportunity to help design and deliver the strategic direction of the Voice Network through 
interactions with Senior Management and the Architecture community

 

As such this role has a significant impact on shaping the Mobile Voice, Convergence Technologies & subsequent 
budget required to deliver it.

What you’ll be doing

• Function as a technical Lead within a team of Design Authorities made up of Specialists and Professionals

• Strong experience of producing brilliant documentation of complex solutions

• Responsible for internal sign-off for any issued design documentation whether it be HLDs, LLDs, Service Requirements or Config Documents

• Provide consultancy to the business to help build IFDs, DADs, TADs

• Detailed understanding of voice core networks as well as wider understanding of mobile and BT core networks and services

• Analytical thinking with the ability to analyse and interpret data, network statistics and financial details

• Strong commercial mind-set and an ability to identify opportunities for efficiency

• Creates and implements technical solutions for a domain or across domains / portfolios of work within a specific technology area

• Autonomously, understanding how solutions impact systems internally and/or externally and assessing impact of change

• Provides technical quality assurance over work of other engineers through matrix team structure

• Provides sound technical expertise to consult on significant component(s) of a technical solution within a specific domain or cross domain

• Identifies opportunities to improve standards of practice within a project, continuously enhancing ways of working

• Reallocates work internally and externally by breaking down technical solutions into smaller delivery elements

• Responsible for flagging and eliminating any potential single point of failure within designs, architecture

• Provide mentoring and coaching to help evolve team skills, host knowledge sessions and design forums

• Support the Senior Manager in the ongoing monthly monitoring and reporting of budgets, CAPEX forecast vs CAPEX spent for planned activities

The skills you’ll need

Expertise: Possess an authoritative understanding of Mobile Voice Networks, Interfaces, Protocols, Standards, and Specifications. 

Telecom Knowledge (Demonstrable skills in): 

• Circuit Switch and IMS VoLTE/VoWiFi/5G Voice 
• Fixed voice services 
• Fixed-mobile convergence (FMC) 
• API Design and Development 
• HTTP/SIP/Diameter/DNS/H.248/CAMEL/SBI 
• IP Networking 
• NFVi, Cloud, and Containerisation Platform and Software Security 
• Software Engineering Practices

•    Proven experience in senior design roles for voice networks. 
•    Effectively communicated complex technical details to diverse audiences. 
•    Collaborated with multiple teams and vendors to customize networks, enhancing features and functionality. 
•    Worked positively with colleagues inside and outside BT to achieve optimal solutions and practices. 
•    Built a strong internal network of relationships to support your role. 
•    Actively engaged in strategy-setting sessions

Our leadership standards

Looking in:
Leading inclusively and Safely
I inspire and build trust through self-awareness, honesty and integrity.
Owning outcomes
I take the right decisions that benefit the broader organisation.

Looking out:
Delivering for the customer
I execute brilliantly on clear priorities that add value to our customers and the wider business.
Commercially savvy
I demonstrate strong commercial focus, bringing an external perspective to decision-making.

Looking to the future:
Growth mindset
I experiment and identify opportunities for growth for both myself and the organisation.
Building for the future
I build diverse future-ready teams where all individuals can be at their best.

A FEW POINTS TO NOTE:

Although these roles are listed as full-time, if you’re a job share partnership, work reduced hours, or any other way of working flexibly, please still get in touch.

We will also offer reasonable adjustments for the selection process if required, so please do not hesitate to inform us.

 

DON'T MEET EVERY SINGLE REQUIREMENT?

Studies have shown that women and people who are disabled, LGBTQ+, neurodiverse or from ethnic minority backgrounds are less likely to apply for jobs unless they meet every single qualification and criteria. We're committed to building a diverse, inclusive, and authentic workplace where everyone can be their best, so if you're excited about this role but your past experience doesn't align perfectly with every requirement on the Job Description, please apply anyway - you may just be the right candidate for this or other roles in our wider team.

 

BENEFITS:

  • Annual On target bonus 15% (personal and company multipliers)
  • Car allowance - worth £5500 a year (can be taken as cash)
  • Private healthcare for you and your family
  • BT Pension scheme; minimum 5% employee contribution, BT contribution 10%
  • Life Assurance
  • Direct share scheme
  • Exclusive colleague discounts on our latest and greatest BT broadband packages
  • 50% off EE mobile pay monthly or SIM only plans and 50% discount for friends and family on EE SIM only plans
  • My Discounts gives colleagues access to unbeatable savings on everyday purchases at hundreds of retailers
  • Discounted EE TV including TNT Sport and the NOW Entertainment membership
  • Great support for working parents including pay whilst on maternity, adoptive, and paternity leave
  • 25 days annual leave (not including bank holidays), increasing with service with buy holiday option
  • Volunteering days so you can give back to your local community
  • Brand new electric vehicle salary sacrifice arrangement, known as ‘My EV’

Apply now »