Case Study: Zopa Bank achieves zero-downtime datacentre exit and £700k+ annual savings with Build Circle

Zopa Bank migrates 40% of core workloads to AWS in 6 months with Build Circle

Zopa Bank, a UK digital bank, faced an urgent challenge when an immovable six-month deadline to exit its costly on-premise datacentre threatened severe financial penalties. Approximately 40% of its core banking estate, including 120 databases holding 60TB of sensitive financial data and 43 interdependent microservices, needed to be migrated under strict regulatory oversight without any disruption to live operations. The bank partnered with Build Circle to achieve this.

Build Circle deployed an autonomous delivery pod to execute a parallelised, zero-downtime migration to AWS. The solution involved migrating and optimizing databases, modernizing .NET applications, and replacing legacy infrastructure with resilient AWS services. As a result, Zopa Bank vacated the datacentre on time, avoiding all penalties. Build Circle helped the bank beat its cloud budget by £420,000 and unlocked over £700,000 in recurring annual savings while modernizing its foundational platform.

Zopa Bank