Prioritising People: The hidden key to successful payment migrations

When it comes to tech migrations in financial services, success is more elusive than most expect. It’s estimated that between 60% to 75% of digital transformation projects fail to meet their intended outcomes - a reflection of the broader, systemic challenges facing the sector.

At the sharp end of these statistics sit organisations facing heavy costs and reputational damage. Consider one major UK high-street bank that locked nearly two million customers out of their accounts following a rushed migration, landing itself with a £330 million loss and a £48 million fine. Or the UK-based payments provider whose six-hour outage brought high-value transactions to a standstill, halting business for clients across Europe.

It’s no surprise many firms are reluctant to press go on a migration. But for payment providers, putting off modernisation isn’t an option. Capabilities have moved on and so have customer expectations. 

Clients now demand flexible, 24-hour payment processing. The answer is modern cloud-built systems shaped around microservices, that enable faster product launches, real-time processing and global scale. Patching legacy systems to try and keep up is a costly and short-lived solution. 

To further reflect this point, an International Data Corporation study found financial institutions miss out on 42% of payments-related revenue if they delay migrating to future-ready platforms.  

The benefits of shifting are clear. The hard part is migrating from old to new.  

Why migrations stumble and fall

It’s rarely the technology itself that derails a migration. More often, it’s how the migration is executed that really counts. 

Even when businesses recognise their legacy systems as a bottleneck and have selected the right platform to move to, cost overruns, delays, and operational disruption remain common.

These issues arise because of factors such as:

• Legacy complexity and fragile systems – Monolithic platforms are riddled with hidden dependencies and brittle batch processes, where a single delay can halt payments. With limited time and expertise, teams often struggle to untangle this complexity.
• Disruptions to daily operations – Modernisation and daily operations need to run smoothly alongside each other. Rigid funding cycles, short-lived project teams and unexpected compliance demands stretch teams between “keeping the lights on” and building the new platform.
• High-risk switchovers – Migrating all users at once is high-risk, leaving little time to test new capabilities or correct errors before they affect the business.
• Skills and alignment gaps – Over-reliance on a handful of vendor engineers creates bottlenecks, while siloed QA, development, and infrastructure teams slow delivery. Poor documentation forces repeated decision-making.
• Process pitfalls – Manual approvals, weak automation, and “log everything” approaches inflate costs without improving insight. Limited monitoring creates blind spots that increase the chance of outages and overruns.

Most of these challenges are organisational rather than technical. In short, it’s about people. By building in the right skills, fostering cross-functional alignment, and establishing clear ownership and processes, you remove the blockers that make even good technology fail. 

This results in fewer costly outages, faster delivery, and programmes that stay on track.

From stalled to scaled

Simplifying systems and making savings 

We worked with a PE-backed global payments provider struggling with fragmented platforms and data mismanagement. Its systems were unreliable and costs were rising, including hundreds of thousands spent just on logging activity. 

Our consultants moved it from legacy data centers to Kubernetes, turning a patchwork of systems into a platform for growth. We also introduced an interim logging solution and rebuilt trust across siloed teams through decision records and workshops.

This reduced operational logging costs by over 90%, and resulted in a board-ready roadmap for continued transformation.

Fast-tracking a checkout transformation

A major UK retailer faced a critical deadline to migrate its legacy ecommerce checkout system to a modern microservices architecture. With millions in licensing fees at stake and a fragmented programme, the risk of failure loomed large.

By introducing Domain-Driven Design, Behaviour-Driven Development, and Event Storming, we set new standards for cross-team collaboration and cloud-native deployment. Of 12 migration teams, we were the only team to deliver all four mission-critical checkout services on time, integrating pricing, promotions, order management and locations seamlessly.

Our timely delivery saved millions in legacy costs and provided a scalable, reusable framework that accelerated the entire programme. 

Migrating with confidence

Organisations that embrace migration early position themselves to lead the payments landscape.

Modern platforms unlock greater agility, speed to market, and resilience, helping providers deliver exceptional customer experiences and launch new propositions faster than competitors still anchored to legacy systems.

While every migration brings complexity, the greatest barriers are often human, not technical. By putting the right people, processes, and plan in place, you can set your transformation up to succeed, and turn migration from a risk into a growth opportunity.

If you’re exploring a payments migration or looking to accelerate one already in motion, we’d love to help.

Book a 45-minute discovery call with our team. We’ll discuss your top challenges and outline a practical path to unlock momentum in your migration.

Get in touch with our team.