Cash Management Transformation

Complex monolithic applications often evolve over years, with layers of business requirements piled on top of one another without clear boundaries. Concepts become intertwined, rules and policies scatter across multiple layers, and implementing changes becomes a daunting task. These systems often rely on a handful of experts, creating bottlenecks when urgent updates are needed.

This was the challenge faced by one of our clients, a leading financial group in Central America. Their cash management solution was a fragile, monolithic system with shallow error handling and no resilience—essentially a house of cards that no one dared to touch. They needed a new solution built from scratch but with one critical constraint: the existing customer interfaces (SOAP services, file sharing, and online banking) had to remain unchanged to avoid disrupting their corporate clients.

We delivered a dynamic, event-driven microservices solution that redefined distributed transactions. Using the Saga Orchestration Pattern, we ensured every transaction remained balanced, while Retry and Circuit Breaker Patterns added resilience. To prevent duplicate credits or debits, we implemented our proven "Ask Before Repeat" method, making the process more complex but far more secure.

The solution also incorporated essential patterns like Database per Service, Event Sourcing, CQRS, Distributed Caching, API Gateway, Health Check API, Log Aggregation, Distributed Tracing, Application Metrics, and Audit Logging.

A key component was the API Gateway, which enabled a seamless transition by gradually redirecting customers to the new system without altering their experience. This approach allowed us to roll out the solution in a controlled, "friends and family" mode, ensuring zero disruption for end users.