Modernising legacy infrastructure is rarely a straightforward technical upgrade. For banks and financial institutions, it is a carefully managed transition that touches core systems across payments, card management, and fraud monitoring.
As transaction volumes grow and new digital channels continue to emerge, older systems struggle to support real-time processing, integrations, and regulatory requirements widening the gap between what existing infrastructure can deliver and what the market now expects. According to McKinsey, many banks are still running on decades-old core systems, which limits their ability to innovate quickly, that in return increases the cost of change.
We live in a digital-first society where customers now expect instant transactions, mobile access, and seamless experiences across channels. Legacy platforms, built for stability rather than adaptability, are not designed to meet these demands quickly. Integrating new services becomes complex, and maintaining these systems slows innovation. Highlighted by Deloitte, modernisation efforts are increasingly focused on improving agility and reducing technical debt, enabling banks to respond faster to market demands while maintaining resilience.
Understanding the different migration approaches
There are no one-size fits all approach for migration, each institution operates within its own constraints, shaped by system architecture, regulatory requirements, and internal readiness. Over time, four main migration approaches have emerged, each offering a different balance between speed, risk, and operational effort:
The Big Bang approach - the transition from the legacy system to the new platform happens within a very short timeframe, often overnight or over a weekend. This method is typically chosen when there is a strong need for rapid transformation or when maintaining the legacy system is no longer viable.
- the Conservative Pilot Run - A more controlled alternative is, which introduces the new system gradually. In this approach, a smaller group of users or selected functionalities is migrated first, allowing teams to test the system in a real-world environment while limiting exposure. This reduces risk and provides time for operational adjustment.
-The Parallel Run approach - running both the legacy and new systems simultaneously. This allows for continuous validation of transactions and outputs, ensuring that the new system performs as expected before the legacy system is fully decommissioned.
- The Phased, or Box Migration approach - is often considered the most balanced. Instead of replacing the entire system at once, migration is carried out in stages, focusing on specific components, products, or customer segments. This allows institutions to manage risk more effectively while maintaining service continuity.
A flexible approach to implementation
In practice, successful migration is rarely defined by strict adherence to a single methodology. Each institution brings its own set of requirements, constraints, and priorities, and these often evolve throughout the implementation process.
What has proven effective is a flexible approach that combines structured planning with the ability to adapt as needed. This includes preparing data in advance, validating processes at each stage, and ensuring that integration points between systems are clearly defined. It also involves leveraging proven tools, frameworks, and methodologies that reduce the need for custom development and shorten implementation timelines.
This is particularly important as, according to World Bank, digital financial infrastructure continues to expand globally, increasing the pressure on banks to modernise systems while maintaining reliability and accessibility.
Equally important is maintaining continuity during the transition. Migration should not disrupt existing services or impact customer experience. Instead, it should allow institutions to operate as usual while gradually introducing improvements behind the scenes.
Where BPC’s SmartVista fits
SmartVista is designed to support all types of migrations be it big bang, conservative Pilot Run, The Parallel Run or The Phased approach. After the initial rollout, migration from the legacy to SmartVista doesn’t affect existing businesses: zero downtime is required for the existing modules during the deployment. By acting as an integration layer, SmartVista can manage message flows between systems, enabling a phased transition where legacy components are replaced. BPC SmartVista platform offers a broad set of APIs that support easy low- to no-code integration with third-party systems, along with multiple users exits for customisation and enhancements, including plugins, stored procedures, containers, reporting, and data extracts.
Being flexible for BPC never meant compromising quality. BPC has achieved the golden mean in terms of our project implementation approach, both people- and product-wise, and is perfectly capable of adapting the methodology to the customer’s requirements without compromising the standards,a skill that was mastered in hundreds of successful implementations across the world. BPC’s current portfolio features replacements of legacy platforms by ACI, Tieto, TSYS, OpenWay, HPS, Electra, FIS and others for 300+ customers, who have opted for our low-risk migration approach
In addition, the platform supports the reuse of existing integrations and certifications, reducing both time and effort during implementation, making infrastructure modernisation practical without disruptions. The result is a migration process that is not only more manageable, but also aligned with the operational realities of banks and financial institutions.
BPC takes its customers through this journey with maximum care and support, advising on the migration scenario that best suits their timings, budget and risk tolerance, and implementing it with a minimal to zero impact on the customer’s operations during the implementation, go-live and stabilisation phases.
What to look forward to
Migration is often perceived as a complex and resource-intensive undertaking, and in many ways it is. However, it also represents an opportunity to rethink how systems are structured and how services are delivered.
A well-executed migration does more than replace legacy technology. It creates a foundation for faster innovation, improved efficiency, and stronger resilience in an increasingly competitive landscape.
The key is not choosing the fastest or the most cautious approach, but selecting the one that aligns with the organisation’s goals and executing it with clarity and flexibility.