Stock Trading App Development

I need an experienced developer to create a stock trading application for iOS and Android platforms.

Key Features:
- Real-time market data
- Portfolio management
- Trading alerts

Ideal candidates should have:
- Proven experience in developing trading applications.
- Expertise in mobile app development for iOS and Android.
- Strong knowledge in stock trading and market dynamics.
- Excellent UI/UX design skills to ensure a user-friendly experience.
- Ability to integrate secure payment gateways and ensure data security.

Please provide examples of previous work, especially any related trading applications.