Budget Gaming Website and App Development

I'm looking for a cost-effective solution to create a gaming website and mobile app for both iOS and Android platforms. The platform should feature both single-player and multiplayer games.

Essential Features:
- Leaderboards
- In-game chat
- User profiles

Ideal Skills and Experience:
- Experience in developing gaming websites and mobile applications
- Proficiency in both iOS and Android platforms
- Strong UI/UX design skills
- Knowledge of integrating real-time features like in-game chat

Please provide a portfolio and a competitive bid.