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Specialist Design Engineer, Voice

Job Req ID:  53433
Posting Date:  26 Nov 2025
Function:  Engineering
Unit:  Networks
Location: 

1 Braham Street, London, United Kingdom

Salary:  Competitive + great benefits

All Locations: London, Birmingham, Bristol, Manchester, Glasgow, Belfast

Working Style: 3 days a week in office, 2 days anywhere

Why this job matters

Microsoft Teams is a massive growth area for BT. We are at a major turning point in the UC marketplace with more and more solutions moving from on-prem to vendor clouds such as Office 365. This role is key in providing innovative, cost-effective ways to compliment these services by enabling PSTN connectivity and providing an end-end service wrap with enhanced QoE tools and reporting.

What you’ll be doing

You’ll be a Subject Matter Expert for Microsoft Teams Direct Routing and Operator Connect with responsibility for technical design, deployment and support of various platforms providing Enterprise Voice for BT business customer both direct and through Wholesale.

 

Specific responsibilities include:-

  • Design & configuration of Audiocodes SBCs connected to a variety of SIP trunking platforms from Enterprise and Wholesale
  • Design & deployment of hosting environment in Azure including support for High Availability
  • Design, deployment & testing of new Teams features such as Local Media Optimisation
  • Engaging with customers to provide expertise and consultancy on both technical architecture and troubleshooting. Eg assisting with “must win” opportunities.
  • 4th line support to key stakeholders
  • Design responsibility for hybrid cloud platforms such as Zoom which make use of the same SBC hosted architecture
  • Maintaining awareness of technical trends and innovation across the UC marketplace and sharing with stakeholders in the LoBs to help BT gain an early mover advantage where appropriate.
  • Driving efficiency and scalability through the re-use of technical designs and automation
  • Proactively simplifying and enhancing the architecture to improve customer experience.

What you'll bring

Mandatory

  • Expert knowledge in Zoom / Skype for Business or Office365 including Skype Online or Teams
  • Knowledge of the Enterprise voice (preferably Microsoft) portfolio and marketplace
  • Knowledge of voice, collaboration and technology trends
  • Experience of consultancy, design, deliver and migration of Microsoft / voice solutions (Skype, Teams Office365)
  • Have a background in producing detailed design documents for a technical audience
  • Be able to consider how any given product or feature will not only be deployed, but how it will supported and maintained in-life, how it will be ordered, and how faults will be resolved
  • Expert knowledge of the different consumption models Wholesale/Direct and how changes in API’s will impact each line of business.
  • Work alongside suppliers, third parties and other teams within BT, such as security, firewalls and data networks.
  • Collaborate with cross-functional teams, suppliers to deliver secure & reliable solution and to ensure technical designs align with product and platform requirements.

 

Nice to have

• Be passionate about working with new technologies and products

• Have the ability to work independently on complex voice and data solutions

• Have experience with Microsoft voice technologies /Teams including Operator connect

• Be comfortable presenting completed solutions to relevant BT teams

• Be comfortable working across multiple projects simultaneously.

• Externally recognised credentials such as Microsoft MCSE  Communications / Productivity or equivalent.

What's in it for you

  • 10% on target bonus
  • BT Pension scheme, minimum 5% Employee contribution, BT contribution 10%
  • Life Assurance Cover
  • Exclusive colleague discounts on our latest and greatest BT broadband packages, BT TV with TNT Sports and NOW Entertainment
  • 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

About us

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 how people connect with each other. 
 
While we are through the most capital-intensive phase of our fibre investment, meaning we can reward our shareholders for their commitment and patience, we are absolutely focused on how we organise ourselves in the best way to serve our customers in the years to come.  This includes radical simplification of systems, structures, and processes on a huge scale. Together with our application of AI and technology, we are on a path to creating the UK’s best telco, reimagining the customer experience and relationship with one of this country’s biggest infrastructure companies.  
 
Change on the scale we will all experience in the coming years is unprecedented.  BT Group is committed to being the driving force behind improving connectivity for millions and there has never been a more exciting time to join a company and leadership team with the skills, experience, creativity, and passion to take this company into a new era.

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.

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