How Monzo Rebuilt Its Core Banking Engine for Real-Time
The CTO Podcast with Fexingo · 2026-06-12 · 9 min
Episode notes
Lucas and Luna dive into how Monzo, the UK digital bank, replaced its legacy core banking system with a real-time event-driven architecture. They explore the technical bet on Apache Kafka as the source of truth, the migration from a batch-processing model to stream processing, and the engineering trade-offs involved in ensuring instant balance updates without breaking financial integrity. With specific numbers on transaction throughput and uptime targets, this episode unpacks a case study in modernizing financial infrastructure at scale. #Monzo #CoreBanking #EventDriven #ApacheKafka #RealTime #Fintech #StreamProcessing #Microservices #Architecture #Migration #FinancialServices #UKTech #Business #Technology #FexingoBusiness #BusinessPodcast #CTOPodcast #TechLeadership Keep every episode free: buymeacoffee.com/fexingo
More from The CTO Podcast with Fexingo
All episodes →- How Airbnb Rebuilt Search for 8 Million Listings42 / 100
- How GitLab Built a Single Codebase for One Million CI Pipelines45 / 100
- How Slack Rebuilt Its Search Index for 10 Million Daily Queries37 / 100
- How Notion Rebuilt Its Sync Engine for Offline-First
- How Notion Rebuilt Its Block Engine for Hybrid Local-Sync