Case Study
Wonga Payday Loan Company
A UK-based payday loan provider requiring a critical platform migration from their legacy V2 UK loans system to a new V3 global loans system.
Their platform served a large customer base requiring continuous availability, and any disruption to service or data integrity issues could have significant regulatory, financial, and reputational consequences.
Engagement Summary
The client engaged us to deliver a zero-downtime migration of their entire customer base from the legacy V2 UK system to the modern V3 global platform.
Over the course of the engagement, we successfully migrated all customers without service disruption, maintained system performance throughout, and delivered within an Agile framework with bi-weekly deployments.
This case study highlights the core workstreams delivered:
- Large-Scale Customer Migration Programme
- Data Integrity & Validation
- Agile Delivery & Continuous Deployment
Workstream 1: Large-Scale Customer Migration Programme
Challenge / Scope
The organisation needed to migrate their entire customer base from the V2 UK loans system to the V3 global platform with zero impact on system performance or customer experience. With a live lending operation, any service disruption or data issues could result in regulatory breaches, customer complaints, and significant financial impact.
What Was Delivered
- Complete migration of all customers from V2 to V3 platform
- Data mapping between legacy and new system architectures
- Phased migration approach to minimize risk
- Performance monitoring and organisation throughout migration
- Rollback procedures and contingency planning
- Business and BI team support during transition
The Outcome
- Successfully migrated entire customer base without service disruption
- Zero impact on customer experience or system availability
- Maintained system performance throughout migration period
- Smooth transition to global platform architecture
- Established foundation for international expansion
- Eliminated legacy V2 system dependencies
Workstream 2: Data Integrity & Validation
Challenge / Scope
Migrating customer data between systems required rigorous validation to ensure complete accuracy, prevent data loss, and maintain regulatory compliance. Any data discrepancies could result in incorrect loan calculations, compliance failures, or customer service issues.
What Was Delivered
- Comprehensive data mapping and validation framework
- Customer and aggregate validation processes
- Data cleansing and organisation prior to migration
- Automated validation checks and reconciliation
- ETL process amendments for data quality
- Continuous data integrity monitoring
The Outcome
- 100% data integrity maintained throughout migration
- Successful validation of all customer records and aggregates
- Improved data quality through cleansing activities
- Regulatory compliance maintained throughout transition
- Confidence in migrated data accuracy
- Established robust validation processes for future migrations
Workstream 3: Agile Delivery & Continuous Deployment
Challenge / Scope
The migration needed to be delivered using Agile methodology with bi-weekly deployments, requiring careful coordination, continuous testing, and rapid iteration. Working within a live production environment demanded rigorous code review and deployment practices to prevent issues.
What Was Delivered
- Bi-weekly deployment cycle throughout migration programme
- Continuous code reviews and quality assurance
- Agile sprint planning and execution
- Continuous integration and deployment practices
- Stakeholder communication and progress reporting
- Iterative refinement based on feedback and monitoring
The Outcome
- Successful delivery using continuous deployment practices
- Rapid response to issues and requirements changes
- High code quality maintained through continuous reviews
- Strong collaboration between development, data, and business teams
- Predictable, reliable deployment cadence
- Established modern delivery practices for future development
Long-Term Impact
Across all workstreams, the organisation successfully transitioned from a legacy UK-only platform to a modern global system, with all customers migrated seamlessly, enabling international expansion while maintaining operational excellence and regulatory compliance.
Technologies & Skills Used
- Data migration (large-scale customer data)
- Data mapping and transformation
- Data validation and reconciliation
- ETL processes (design and organisation)
- Data cleansing and quality management
- SQL Server (or relevant database platform)
- Agile methodology (sprint planning, execution)
- Continuous deployment practices
- Code review and quality assurance
- Performance monitoring and organisation
- Business intelligence support
- Stakeholder management
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