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Twine

Freelance Application Developer – Fintech App Optimization

Twine
Switzerland · Contract · Mid-Senior

Join an exciting fintech project focused on delivering a seamless mobile wallet experience for users and small businesses in Nigeria. This role centers on refining and optimizing a fully developed Flutter application in its final pre-launch phase. You will play a key part in ensuring the app is production-ready by addressing UI inconsistencies, debugging, and enhancing user flows, particularly onboarding. The ideal candidate will demonstrate a strong attention to detail, a passion for clean execution, and the ability to work efficiently under tight timelines. This is a targeted engagement to finalize and optimize the current implementation, with the potential for ongoing collaboration.

Deliverables

  • Refine and clean up UI components to ensure visual consistency across the app
  • Debug and resolve existing bugs affecting user experience and app stability
  • Optimize onboarding flows for clarity, speed, and ease of use
  • Enhance navigation and user journey throughout the application
  • Debug and improve API integrations for reliable data flow and performance
  • Conduct performance optimization to ensure smooth operation on a range of devices
  • Prepare the app for a seamless, production-ready launch

Requirements

  • Proven experience developing and optimizing Flutter mobile applications
  • Strong skills in Dart and Flutter framework, with a portfolio of published apps
  • Demonstrated expertise in UI/UX best practices and mobile app debugging
  • Experience with API integration and troubleshooting in mobile environments
  • Ability to identify and resolve performance bottlenecks
  • Familiarity with fintech or payment platforms is a plus
  • Excellent attention to detail and commitment to delivering high-quality work
  • Availability for immediate engagement and ability to work independently
  • Strong communication skills and responsiveness

About Twine

Twine is a leading freelance marketplace connecting top freelancers, consultants, and contractors with companies needing creative and tech expertise. Trusted by Fortune 500 companies and innovative startups alike, Twine enables companies to scale their teams globally.

Our Mission

Twine's mission is to empower creators and businesses to thrive in an AI-driven, freelance-first world.

Key Skills

Ranked by relevance

flutter ui dart ai
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Posted
Apr 01, 2026
Type
Contract
Level
Mid-Senior
Location
Switzerland
Company
Twine

Industries

Software Development

Categories

Engineering

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