How Data Stack Modernization is Helping Kroo Bank Secure its Challenger Status

Kroo Bank, a UK-based digital-only bank, has leveraged data stack modernization to support its growth and maintain its challenger status in the crowded fintech market. The company's architecture was designed with scalability in mind using PostgreSQL as its database and Apache Kafka for message distribution. As Kroo secured more customers, it faced limitations with its self-managed Kafka cluster, prompting a switch to Aiven for Apache Kafka. This managed solution allowed the bank to focus on revenue-generating activities while maintaining alignment with the open-source Kafka ecosystem. The company is now exploring options like tiered storage and streaming applications to optimize costs and enhance its data platform further.