Client's Testimonial

The decision to migrate our native apps to Flutter with Developers.dev has been transformative. Their team handled the complexity of our extensive backend systems with incredible professionalism. We now have a single, beautiful app that is easier to maintain and faster to update. The 50% reduction in our mobile TCO speaks for itself. Their CMMI Level 5 process was evident in the smooth, predictable execution.

Markus Weber, Head of Digital Commerce

Client Overview

A global retail giant with over 500 stores across the EU and USA was struggling with their aging mobile applications. They had separate, siloed teams maintaining their native iOS (Swift) and Android (Kotlin) apps. This led to inconsistent user experiences, slow feature rollouts, and ballooning maintenance costs. They needed a unified, modern solution to improve operational efficiency and deliver a better customer experience.

Problem

The client's dual-platform approach was unsustainable. Feature parity was a constant struggle, and any new update required double the development, testing, and management effort. The apps were built on older native technologies, making them difficult to update and prone to performance issues. The total cost of ownership (TCO) was becoming a significant drain on their IT budget.

Key Challenges

Complex Backend Integration

The apps integrated with dozens of legacy backend systems for inventory, pricing, loyalty, and CRM.

Zero-Downtime Migration

The new app needed to be rolled out seamlessly without disrupting the existing user base of millions.

Feature Parity and Enhancement

The new Flutter app had to replicate all existing features while also introducing new, modern functionalities.

Change Management

Transitioning two large, independent native teams to a new, unified development process.

Our Solution

We proposed a phased migration strategy to Flutter, designed to minimize risk and ensure business continuity. Our solution focused on creating a single, high-performance codebase that would serve as the foundation for their mobile commerce for years to come.

🔍 Deep-Dive Audit

Our architects conducted a comprehensive audit of their existing native apps and backend APIs to create a detailed migration roadmap.

🏗️ Modular Re-architecture

We rebuilt the application in Flutter module by module, starting with less critical features and progressively replacing the entire native app.

🎨 Unified Design System

Our UI/UX team created a new, modern design system that was implemented in Flutter to ensure brand consistency and a superior user experience on all devices.

🤝 Dedicated Migration POD

We assigned a dedicated "Flutter Modernization POD" with expertise in both native platforms and Flutter to ensure a smooth transition of knowledge and logic.

Implementation and Execution

API Gateway Creation

We first helped the client build an API gateway to streamline communication between the new Flutter app and their legacy systems.

Phase 1: Core User Journey

We rebuilt the core user journey-browsing, searching, and viewing products-in Flutter and released it as an update.

Phase 2: E-commerce Engine

We then replaced the entire checkout, payment, and order history flow.

Phase 3: Loyalty & Personalization

The final phase involved migrating the complex loyalty program and personalization features.

Parallel Testing

We ran extensive parallel tests between the old native apps and the new Flutter app to ensure 100% data and logic integrity.

Phased Rollout

The new app was rolled out to users in stages, starting with 1% of the user base and gradually increasing to 100% to monitor performance and stability.

Positive Outcome

💰 50% TCO Reduction

By unifying the codebase and teams, the client reduced their total cost of ownership for mobile development and maintenance by half.

⚡ 60% Faster Feature Release

New features can now be developed and deployed to both iOS and Android simultaneously, accelerating their product roadmap.

⭐ Improved App Performance

The new Flutter app had a 20% faster startup time and a 99.95% crash-free session rate, leading to higher user satisfaction.

📈 Higher Conversion Rate

The modern UI/UX and improved performance led to a 15% increase in the mobile conversion rate within three months of the full rollout.

Why Choose Us

🎓 Migration Experts

Proven expertise in complex legacy-to-Flutter migrations.

🏢 Enterprise Scale

Experience working with large, global organizations and complex systems.

✅ Process Maturity (CMMI 5)

Our disciplined process minimized risk in a highly complex project.

🧩 Full-Stack Capability

Our ability to assist with API gateway development was crucial.

💪 Risk Reversal

Our guarantees provided the client with confidence in our ability to deliver.

🤝 Seamless Collaboration

We worked closely with their internal teams to ensure a smooth transition.

🎯 Outcome-Oriented

Our focus was not just on technology but on achieving the client's business goals.

🔒 Secure & Compliant

Our ISO 27001 certification ensured all data was handled securely.

🚀 Dedicated POD Model

The client had a dedicated, expert team focused solely on their success.

Conclusion

This project demonstrates that Flutter is a powerful and mature solution for enterprise app modernization. By partnering with Developers.dev, the client was able to escape the technical debt of their legacy native apps, significantly reduce operational costs, and deliver a superior digital experience to their customers.

Modernizing a Legacy Retail App for a Global Enterprise, Reducing Maintenance Costs by 50%

Industry Retail & E-commerce