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Climby: From Flutter Technical Debt to React Native Success

Discover how Climby successfully migrated from Flutter to React Native in just 3 weeks, eliminating technical debt and enabling platform scaling without service interruption.

Selego

Migration
Climby React Native Migration

A Flutter application that prevented scaling

Climby is a platform dedicated to athletes and sports enthusiasts, providing a space where athletes can share their journey, interact with their fans, and monetize their content. The MVP, developed over several months, integrated basic features such as subscription management and interactions. However, from its inception, the MVP had technical debt that hindered its ability to evolve and adapt to growing user needs. This debt made it difficult to add new features and efficiently manage the platform, thus limiting Climby's development.

Migrating from Flutter to React Native without service interruption

The Climby project took place in a context of technological migration, moving from Flutter to React Native. This change was motivated by the need to eliminate the technical debt accumulated in the MVP and start fresh with solid foundations to allow better scalability. The migration proved particularly challenging due to active users on the platform. We had to ensure no service interruption while improving the application's fluidity and optimizing development speed to respond more effectively to user needs.

Steps for a successful React Native migration

The steps for a successful migration to React Native for Climby took place in several key phases. In just three weeks, we rebuilt the application in React Native, focusing on:

  • UX/UI Optimization: Simplifying the user experience to enable more intuitive navigation, centered on essential features.
  • Data model change: We migrated from Firebase, a proprietary technology, to a generic solution for greater flexibility and scalability.
  • Subscription and premium content management: A system was implemented via Stripe to efficiently manage subscriptions and protect premium content.

The migration was completed in a single evening, allowing the switch to the new architecture without service interruption for active users.

In parallel, an administration interface was developed in just one week, offering efficient application control and allowing the team to manage data and users centrally.

Finally, we integrated OneSignal for push notifications and ensured smooth deployment on Android and iOS stores, while collecting and adjusting user feedback for continuous improvements.

Continuous Monitoring for Optimal User Experience

Since launching the new version of the application, we have continued to support Climby in its evolution, optimizing features and monitoring application performance. We have also implemented a user feedback tracking system, allowing quick identification of areas for improvement and deployment of updates accordingly.

CEO Testimonial 💬

"We were facing scalability and stability issues with our MVP that prevented us from scaling properly. Selego's support helped us de-risk the tech"

Key Achievements

  • 3-week migration from Flutter to React Native
  • Zero service interruption during the transition
  • Improved scalability and technical foundation
  • Enhanced user experience with optimized navigation
  • Robust subscription system via Stripe integration
  • Admin interface developed in just one week
  • Push notifications via OneSignal integration

Technical Challenges Overcome

Technical Debt Elimination

  • Migrated from Firebase to generic database solution
  • Rebuilt architecture for better scalability
  • Eliminated performance bottlenecks

Migration Strategy

  • Parallel development to minimize downtime
  • Gradual feature migration
  • Comprehensive testing before deployment

User Experience Improvements

  • Simplified navigation and interface
  • Faster app performance
  • Better cross-platform consistency

Results & Impact

Before Migration

  • • Technical debt limiting growth
  • • Difficult to add new features
  • • Performance issues
  • • Scalability problems

After Migration

  • • Clean, scalable architecture
  • • Rapid feature development
  • • Improved performance
  • • Better user experience

Technologies Used

Frontend

React Native

Payments

Stripe

Notifications

OneSignal

FAQ

How long did the migration take?

The complete migration was completed in just 3 weeks, with zero service interruption for users.

What were the main challenges?

The biggest challenge was ensuring no service interruption while migrating active users from Flutter to React Native.

How did you handle the data migration?

We migrated from Firebase to a generic database solution, ensuring data integrity and improved scalability.

Lessons Learned

  • Technical debt should be addressed early to prevent scaling issues
  • Proper planning is crucial for zero-downtime migrations
  • User feedback should guide continuous improvements
  • Robust architecture from the start enables faster development