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Case Study - API Modernization for a U.S. Credit Union

  • Writer: antony melwin
    antony melwin
  • Nov 7
  • 1 min read
Person pointing at computer screens, working with code. Blue-purple gradient background with text: "API Modernization for a U.S. Credit Union."

When the Monolith Slowed Innovation

This U.S. credit union had ambitious digital goals, but its monolithic application architecture couldn’t keep up. Every new release required weeks of regression testing, integrations took months, and scaling up services for new member features strained infrastructure.

Licensing costs for their legacy API gateway were increasing year over year, and the absence of modern DevSecOps practices meant releases lacked consistency and traceability.


Objective:

To modernize the API layer for agility, cost efficiency, and scalability while maintaining service stability.


WhiteBlue’s Approach and Solution Design

WhiteBlue implemented a hybrid modernization strategy built on Microsoft Azure.

The approach combined microservices architecture, DevSecOps automation, and API standardization to deliver rapid yet controlled transformation.


Key components included:

  • Replacing the on-premise API gateway with Azure API Management (APIM).

  • Deploying modular, domain-driven microservices using Azure Kubernetes Service (AKS).

  • Automating deployments and testing with Azure DevOps pipelines integrated with code scanning and traceability.

  • Embedding continuous compliance through DevSecOps guardrails.


This strategy improved development velocity while cutting recurring licensing costs by over 60%.


API Modernization Implementation Journey

The transition followed a coexistence model - new APIs were launched on Azure while legacy ones continued serving critical workloads. Once stability was confirmed, remaining APIs were migrated.


Results

  • 5× faster release cycles

  • 60% reduction in API management costs

  • Improved traceability through DevSecOps integration

  • Stable and scalable API ecosystem supporting partner integrations


About WhiteBlue

WhiteBlue supports financial institutions in building secure, scalable digital ecosystems through cloud-native modernization, automation, and governance.

This project highlighted WhiteBlue’s expertise in balancing transformation speed with operational risk management.

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