Fintech App Developer for Bill Payment MVP

I'm looking for an experienced fintech app developer to create a Minimum Viable Product (MVP) for a bill payment application on both Android and iOS platforms.

Key Features:
- User registration/login
- Bill payment interface
- Transaction history

Payment Methods:
- Credit/Debit Cards
- Bank Transfers

Ideal Skills and Experience:
- Proven track record in fintech app development
- Expertise in secure payment integration
- Experience with both Android and iOS platforms
- Strong UI/UX design skills to ensure a user-friendly experience
- Familiarity with data security and privacy regulations

Please provide a portfolio showcasing similar projects.