MVP Mobile Investment App Development

I'm seeking a skilled web and mobile app developer to create a Minimum Viable Product (MVP) for our investment platform on both iOS and Android.

Essential Features:
- User Account Management
- Investment Tracking
- Secure Payment Gateway

Ideal Skills:
- Experience in developing secure and scalable mobile applications
- Proficiency in both iOS and Android development
- Strong background in implementing user account management and investment tracking systems
- Knowledge of secure payment integration

Please share your portfolios and relevant experience.