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Discover how Monzo built a completely separate backup banking system called "Monzo Stand-in" to ensure customers maintain access to their money even during complete platform outages. Learn about the architectural decisions, trade-offs, and engineering challenges involved in creating an always-on disaster recovery system that operates independently from Monzo's main AWS infrastructure by running entirely on Google Cloud. Explore the design principles behind a system that maintains near real-time synchronization, enables continuous production testing, and can be activated within seconds during critical incidents. Gain insights into managing large-scale organizational programs that touch every part of a company, including the pragmatic approaches used to deliver this comprehensive disaster recovery solution in just 10 months. Understand the technical details of building resilient financial systems, the hurdles encountered during development, and the strategic decisions that enabled rapid delivery while maintaining the reliability standards expected by banking customers who need 24/7 access to their funds.
