Fintech App Development -- 2

I'm looking for an experienced full stack developer to create a comprehensive fintech app that will be available on iOS, Android, and Web platforms.

Core functionalities of the app will include:
- Budget management tools
- Ledger keeping features
- Document storing capabilities

Ideal Skills and Experience:
- Proficiency in developing cross-platform applications
- Strong background in budget management and financial tools
- Experience with secure document storage solutions
- Familiarity with UX/UI design for a seamless user experience across all platforms
- Expertise in backend technologies and database management

Please provide a portfolio showcasing similar projects.