Core banking modernization at a leading Ecuadorian institution
Leading bank in Ecuador
The challenge
The institution operated with a 15-year-old monolithic core banking system built on on-premise technology. Deployment cycles took weeks, production incidents were frequent during maintenance windows, and integrating new digital channels required months of effort. The IT team dedicated over 60% of its capacity to corrective maintenance, blocking any innovation initiative.
The solution
We designed an incremental modernization plan based on the Strangler Fig pattern: without stopping operations, we extracted high-impact modules into cloud-native microservices on AWS EKS. We implemented an API layer with AWS API Gateway to decouple digital channels from the core. We automated CI/CD pipelines with GitHub Actions and Terraform, reducing deployment times from weeks to hours. The migration was phased by functional domain, with guaranteed rollback at each stage.
Results
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Deployment cycle reduced from 3 weeks to under 4 hours
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System availability improved from 97.2% to 99.5% annually
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New features integrated in days, not months
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55% reduction in time spent on corrective maintenance
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Zero major incidents during the migration process
Technologies
- AWS EKS
- AWS API Gateway
- Java / Spring Boot
- PostgreSQL
- Terraform
- GitHub Actions
- Kafka
- Datadog
"The Gizlo team understood our context from day one. They worked alongside us as an internal team, with the seriousness that a critical financial system demands."
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