Banking · Core Transformation
Core banking migration to domain-driven microservices
Bounded-context-by-bounded-context decomposition of a monolithic core — accounts, credit, payments, compliance — migrated in continuous production.
Context
A regional bank operated a monolithic core banking system over twenty years old, on which all business depended. Deployment windows stretched over weeks and any evolution required full maintenance windows. Technical debt made fast integration with new fintech partners impossible.
Challenge
Decompose a critical monolithic core into domain-driven microservices without ever stopping the production system — and without compromising financial data consistency or banking regulatory requirements.
Our approach
How we built it
Domain-Driven Design (DDD) approach: identification of bounded contexts (accounts, credit, payments, compliance), domain-by-domain extraction with transient dual-write. Anticorruption layer pattern for interoperability with the legacy during migration. Contract testing (Pact) between services from the first sprint.
Engagement model
Measured outcomes
0
Service interruptions
4 domaines
Extracted and live
–70%
Deployment time per domain
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