Osborn Maja Mangaro
I’m a Mobile Developer and UX/UI Designer with 1.5+ years of production experience building and shipping cross-platform fintech apps.
About
I’m a Mobile Developer and UX/UI Designer with 1.5+ years of production experience building and shipping cross-platform fintech apps. I combine Figma-based UX work with hands-on Flutter, Dart, React Native, and TypeScript development to improve onboarding and payment experiences, translating designs into responsive, reliable mobile interfaces.
At Roamtech Solution, I’ve worked on remittance and loan-related transaction flows—integrating KYC, M-Pesa, and payout APIs, implementing real-time updates, and strengthening safeguards against duplicate events. I’m also passionate about quality and performance, supporting features with testing, crash reporting, analytics, and CI/CD automation to deliver dependable user experiences.
- 1 year's experience
- Joined October 2026
Industry experience
- Financial Services
- Software & Internet
Work experience
Contributed to migrating the Afrisend international money-transfer app from legacy Kotlin/Java to modular Flutter architecture. Built and shipped production features for Tumatuma (international money transfer), including safeguards to reduce duplicate payout events via controlled/concurrent processing. Integrated Veriff KYC, M-Pesa, and international bank payout APIs across identity verification and payment workflows. Implemented WebSocket-based real-time transaction updates for immediate status feedback. Improved Senti loan repayment journey, contributing to over KES 1M in total loan recoveries during 2025–2026. Optimized adaptive UI for tablets and foldables, integrated Firebase Crashlytics and Analytics for faster debugging and data-driven UX improvements, and automated CI/CD with GitHub Actions and Fastlane.
Built and launched the initial Tumatuma cross-platform MVP using React Native and TypeScript/JavaScript, developing reusable components and production features. Led a mobile UI/UX revamp by migrating legacy Adobe XD designs to Figma and implementing the resulting interfaces in React Native. Identified design-to-implementation gaps (e.g., missing permission screens and transaction fallback states) to improve experience completeness. Reduced the app bundle size from ~100MB to ~50MB through dependency analysis and build optimizations, and investigated rendering issues and UI flickering using Expo and developer tools.
Education
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