Multiplayer Blackjack Game Development

I'm looking for an experienced developer to create an online multiplayer blackjack game. The game should be available on both web and mobile platforms (iOS and Android).

Key requirements include:
- Social media login integration
- Smooth, engaging user interface
- Secure and scalable backend

Ideal skills and experience:
- Proficiency in web and mobile app development
- Experience with multiplayer game mechanics
- Strong knowledge of social media APIs and authentication

Please provide a portfolio of similar work.