Cross-Platform Gambling App Development

I'm seeking an experienced developer to create a complex gambling app, available on iOS, Android, and Web platforms.

Key Requirements:
- Primary function: Gambling
- Platforms: iOS, Android, Web

Ideal Skills:
- Extensive experience in developing secure, scalable gambling applications.
- Proficient in iOS and Android app development.
- Strong web development skills.
- Knowledge of gambling regulations and compliance.
- Expertise in UX/UI design for a seamless user experience.
- Experience with payment gateways and in-app purchases.

Please provide a portfolio showcasing similar projects and an estimate of time and cost.