Innovating with an API-Led Integration Architecture Built on MuleSoft

“Green Irony’s ability to align our API strategy to deliver meaningful business outcomes is what makes them such a valuable partner. Their MuleSoft and enterprise architecture expertise along with their collaborative and efficient delivery process has helped us expedite key initiatives. We’re now in a stronger position to scale for the future.”

Sapana Patel, Sr. Director, Solution Delivery & Architecture
Innovating with an API-Led Integration Architecture Built on MuleSoft

The Challenge

Spirit Airlines had legacy systems, a large homegrown infrastructure, and external airline service platforms that they needed to unlock to facilitate their digital transformation. With a growing number of third-party service providers that needed to interact with their systems, Spirit needed to rebuild its data infrastructure and data pipeline. They chose MuleSoft as the backbone of their data integration system, which they identified as one of the most critical components in building a scalable, reliable solution for their business needs.

The Objective

  • Unlock Spirit’s homegrown data, infrastructure, and external service platforms by converting their internal application network (legacy system) into an API-led integration with
  • MuleSoft within a 12-week period
  • Unlock guest services data with reusable APIs to enable additional customer support streams and vendors
  • Disseminate flight information and updates to internal and external systems through data integration
  • Minimize government regulator compliance fees by improving processes on updating reservations, booking information, and scheduling transactions
The Objective

The Solution

To enable their integration needs, the Green Irony team worked closely with Spirit’s business stakeholders and technology teams to identify and diagnose problems that would move the business forward and eliminate roadblocks in customer interactions. Once Green Irony and Spirit aligned on the specific business outcomes and requirements needed for Spirit to achieve their goals, we planned and designed the solutions to address current pain points and enable Spirit to scale to meet future needs.


  • Designed the event-driven system with an API stack that allows customers to retrieve booking information, make flight changes, add special service requests, update baggage information, and more through conversation bots and live customer service support
  • Built an API-led architecture that combined MuleSoft and Azure offerings
  • Decoupled guest loyalty events from high-traffic APIs to increase speed and fuel scalable architecture
  • Connected Spirit’s legacy core APIs with their customer reservation system
The Solution

The Results

The API-led integration architecture built on MuleSoft has provided Spirit Airlines with the ability to rapidly integrate and connect external and internal data systems in a safe and easily monitored environment. As a result, Spirit can reuse data components for future projects and enable them to grow in a scalable fashion. With the powers of Green Irony and MuleSoft combined, Spirit Airlines now has:


  • Minimized unnecessary government regulator compliance fees
  • Enabled new chat and social media engagements that allow customers to purchase upgrades (including wifi), and make changes to reservations, bookings, and scheduling transactions
  • Increased velocity on internal processes
  • Reduced complexity and onboarding of individual third-party partners and data providers

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