Wealthtech
Jonatan Mars
Investment management mobile app with KYC, document signing, portfolio tracking, and multi-platform deployment.
- Role
- Mobile Developer
- Years
- 2025–present
- Domain
- Wealthtech
- Live at
- jonatanmars.com
-
3,500+
Accounts migrated and live
-
8,500+
Paid transactions processed
-
3
Platforms from one codebase
iOS, Android, web
The work
Full-featured fintech mobile app for managing investment portfolios and strategies, replacing a web platform that shared the same database. Built with React Native + Expo for iOS, Android, and web from a single codebase.
Supabase handles the backend: PostgreSQL database, auth, edge functions, and file storage. Implemented SumSub for KYC verification, a signature canvas for legal documents, PDF generation for investment reports, and data visualization with react-native-graph.
The app has a comprehensive data management layer: database migrations, seeding, import scripts, and custody holdings sync. PostHog for analytics, Sentry for error tracking, GitHub Actions + EAS for CI/CD.
Since the app went live in February 2026 it has carried 3,500+ accounts and 8,500+ paid transactions.