Monument Technology Partners With Castle Trust Bank on Platform Deal

WHY THIS MATTERS: The decision by Castle Trust Bank to outsource its critical savings infrastructure to Monument Technology’s platform is a powerful validation of the Core Banking Modernization trend sweeping the European market. This move signals a definitive shift among regulated financial institutions to abandon prohibitive legacy IT and embrace the flexibility of cloud-native systems. For specialist banks, a Banking Platform as a Service (BPaaS) model offers a clear pathway to agility, enabling rapid product deployment—such as the new Easy Access range mentioned—and streamlined operations without the massive upfront capital expense. This announcement goes beyond a simple contract win; it provides a live, regulated use case that addresses the industry’s most pressing pain point: achieving true scalability and efficiency in a fiercely competitive UK savings environment. Competitors clinging to older infrastructure should view this migration as a critical signpost for where the market is headed.

Banking platform provider, Monument Technology, has announced a partnership with Castle Trust Bank to deploy its Banking Platform as a Service (BPaaS), marking its second major client and first UK-regulated bank client.

The partnership will involve Castle Trust Bank migrating its savings business onto Monument Technology’s platform, with implementation already under way and completion targeted for early 2027.

Monument Technology’s platform is a cloud-native Banking Platform as a Service, combining core banking, payments and customer channels into a single managed solution. It is designed to help financial institutions reduce reliance on legacy systems and support faster product development.

Castle Trust Bank, which launched in 2012 and became a fully regulated bank in 2020, offers a range of savings products, including ISA accounts, alongside specialist property and consumer finance (via its Omni business). The move forms part of the bank’s wider plans to invest in its technology infrastructure and support future growth plans including the introduction of a new Easy Access product range.

Monument Technology said the deal is particularly significant as Castle Trust Bank is the first UK-regulated bank to adopt its platform, choosing it to upgrade and transform its savings business and demonstrating confidence in both the technology and its delivery model.

The platform is designed to evolve with each new client, with enhancements and features developed collaboratively and made available across the wider client base.

Earlier this month, Monument Technology confirmed the completion of its first full deployment with Ecology Building Society, providing a live proof point for the technology in a regulated environment.

Nick Lawler, Chief Commercial Officer at Monument Technology, said: “This is an important partnership for us and reflects the momentum we are building as more institutions look to adopt modern, scalable platforms and enhance their core and digital platforms.

“Castle Trust Bank is implementing a Banking Platform as a Service that will allow it to scale more effectively, streamline its savings operations and bring products to market more efficiently.

“Ultimately, this is about putting in place a platform that will support their business for the long term.”

Nick Bennett, Chief Technology and Operations Officer at Castle Trust Bank said: “We are delighted to be working with Monument Technology as part of our continued investment in the Bank’s savings proposition and long-term capability.

This partnership represents a significant investment for the Bank, enabling us to enhance our Savings product suite, scale more efficiently and respond more quickly to the expectations of our customers as we continue to grow our Savings business.

By moving to a more modern platform, we are better equipped to innovate and enhance our proposition as the UK Savings market continues to evolve, while maintaining a highly resilient and consistent core offering.”

FF NEWS TAKE: This partnership is a significant needle-mover, providing Monument Technology with a crucial anchor client in the highly regulated UK banking sector, especially following their earlier work with Ecology Building Society. The move underscores the growing confidence in the BPaaS model for non-lending-focused portfolios. For the next step, we must watch the execution: a smooth, on-schedule migration by early 2027 will cement Monument’s position as a serious core challenger, likely opening the floodgates for similar tier-two banks looking to unbundle their technology stacks.