BT Group moves from mainframes to the cloud with Kyndryl

A BT shop.

BT Group moves from mainframes to the cloud with Kyndryl Duncan is an award-winning researcher, with 20 years experience of analysing the technology industry, specialising in cloud computing, edge computing, blockchain, cybersecurity and marketing technology.


BT Group’s Digital Unit has begun working with IT infrastructure services provider, Kyndryl, on a cutting-edge programme to move a number of the Group’s mainframe applications which service its legacy copper business and consumer broadband products to the cloud.

The unique and complex project will see the Digital unit move critical legacy applications that cannot be shut down in the short term to the cloud, allowing it to operate its copper broadband infrastructure in a modern way. The ten-year partnership, which draws on Kyndryl’s hyperscaler capabilities and partner ecosystem, will allow BT Group to reduce mainframe operating costs and energy consumption by 70%, leading to savings worth more than £17m a year by 2026.

Harmeen Mehta, chief digital and innovation officer at BT Group, said: “We like thinking out of the box to solve complex problems – like how to move off mainframes given the prohibitive increase in legacy infrastructure cost – without rewriting decades-old applications.

“With that mindset, working with Kyndryl, we figured out how to turn legacy mainframes into modern digital apps and run them at a fraction of the cost.”

Kyndryl, which currently runs BT Group’s mainframe estate, extends its partnership with BT to deliver the transformation project by 2026, accelerating the drive to reduce cost and open up data insights within these key applications. As part of the project, some applications are being ‘retired’ (contributing to the Group’s target to get to fewer than 500 strategic systems by 2027, simplifying its technology estate), ‘refactored’ (redeveloped into BT Group’s existing strategic systems and architecture) or rehosted (repackaged to operate in a cloud environment). 

In moving to the cloud, the applications will become more ‘digital’ with application programming interface (API) and micro-services capabilities developed to help integrate the value of data across wider BT Group systems and drive innovation through automation, while lowering costs. Applications will be hooked into BT Group’s service management platform, and support its ‘AIOps’ self-healing IT estate model, reducing the risk of downtime and accelerating and automating fixes. It will enhance other applications´ ability to call on data and capabilities within the mainframe applications, giving rise to more seamless customer experiences, supporting customers with the migration to modern fibre services as the legacy copper networks are retired in the years ahead.

Petra Goude, global practice leader, Core Enterprise & zCloud, Kyndryl, said: “It’s exciting to be partnering with BT Group on such an ambitious and critical programme. Migrating from mainframes to cloud extends the usefulness and lifespan of these applications in a modern, micro-services led, cloud-centric way and helps unlock intelligent data insights. We’re excited to draw on our deep knowledge, ecosystem of partners and community of industry leading experts to help deliver this transformation.”

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