Undocumented Legacy Flows
Existing APIs had little documentation, so the team reconstructed integration logic from the flows themselves and validated it against live behavior.
UK's Oldest Private Bank Achieved
Zero-Downtime MuleSoft to Spring Boot Migration
Client Overview
Our client is the UK’s oldest private bank, with a heritage spanning more than 350 years of continuous service. The bank is known for its discretion, stability, and client-first approach, providing financial services to high-net-worth individuals, families, and institutions. The organization blends long-standing tradition with modern engineering practice, continuously evolving its digital infrastructure while holding to the values that have defined it.
The bank approached NeosAlpha to modernize its API infrastructure, with cost control as the primary driver. Its integration and API management ran on MuleSoft, where enterprise licensing was expensive, per-API usage charges were mounting, and platform flexibility was limited. The bank wanted an open-source alternative that would integrate cleanly with any API gateway and return full code ownership to its engineering team.
Business Objective
The bank wanted to modernize its API infrastructure by moving off MuleSoft to an open-source foundation that its own engineering team could own and extend. Enterprise licensing costs were high, per-API usage charges were mounting, and platform flexibility was limited by a proprietary runtime the team could not modify.
The objective was to rebuild the full API estate on Java Spring Boot with matching functionality and zero downtime, remove licensing and per-API costs, regain complete control over the codebase, enable integration with any API gateway including Apigee, Kong, and AWS API Gateway, and establish a containerized, CI/CD-ready architecture that supports future scaling.
Industry
Banking and Financial Services
Platform
Spring Boot
Service
MuleSoft to Spring Boot Migration
Nick Owen
CTO
We are thrilled to share our positive experience with NeosAlpha. Initially engaging them for their...
Read More Challenges
Connector Dependency Mapping
MuleSoft's native connectors and processors required equivalent Spring Boot libraries or custom implementations, each verified for functional parity.
Error Handling Parity
Centralized error handling available by default in MuleSoft had to be explicitly designed in Spring Boot to keep behavior consistent across all services.
Security and Compliance
Operating in a regulated banking environment meant every build had to pass vulnerability scanning and compliance review before it could progress.
Zero-Downtime MuleSoft to Spring Boot Migration
Move off expensive integration licensing without disrupting your business. Our engineers rebuild your APIs on open-source foundations with full functional parity and zero downtime.
Explore Our Cloud Native ExpertiseSolutions
Assessment of Existing APIs
Analyzed the full MuleSoft estate, mapping every dependency, endpoint, and system interaction to establish the true scope of the migration and a prioritized sequence for delivery.
Spring Boot Microservice Design
Translated each MuleSoft flow into an independent microservice with clearly defined API structures and data models, so new functionality can be added later without touching existing services.
Business Logic Reconstruction
Re-engineered the business logic, data transformations, and system interactions originally built in MuleSoft, preserving functional behavior while making the codebase simpler to test, debug, and maintain.
Explicit Error Handling Framework
Designed a consistent error handling and logging pattern across all services to replace MuleSoft's built-in centralized model, giving the bank predictable failure behavior across the estate.
CI/CD and DevOps Integration
Containerized every microservice and integrated them into the bank's existing CI/CD pipelines with Azure Repos for version control, enabling automated deployment and early detection of issues.
Security Hardening and Quality Assurance
Ran vulnerability scanning and maintained code hygiene throughout development, so the final handover contained no outstanding vulnerabilities and met the bank's compliance obligations.
Results
240+ Endpoints Migrated With Zero Downtime
The full endpoint estate moved from MuleSoft to Spring Boot with matching functionality and no interruption to business operations.
Reduced Platform Costs
Removing MuleSoft enterprise licensing and per-API usage charges brought API delivery onto a zero-licensing open-source model.
Full Code and Architecture Ownership
The bank's engineering team now holds complete access to and control over its API code, with no dependency on a proprietary runtime.
API Gateway Flexibility
Spring Boot services can front onto Apigee, Kong, AWS API Gateway, or any other gateway, removing the lock-in that came with the previous platform.
Faster, Repeatable Deployments
Containerized services in automated CI/CD pipelines shortened release cycles and reduced the manual effort in each deployment.
Future-Ready Architecture
A modular microservice foundation that supports scaling and further integration work without the risk of system-wide failures.
Technology Stack
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