Cross-Platform 3D Multiplayer Game Development

I'm looking for an experienced game developer to create a 3D multiplayer game similar to "Steal Time modded" but with a twist: instead of time players will get fake robux . The game should be available on all platforms (PC, Mobile, Web) and must include in-game purchases.

Key Requirements:
- 3D Game Development for Multiplatform
- Engaging Multiplayer Mode
- Customizable Characters
- Implementing In-Game Purchases

Ideal Skills and Experience:
- Proficiency in Unity or Unreal Engine
- Strong background in 3D modeling and animation
- Experience in developing secure and user-friendly in-game purchase systems
- Previous work on multiplayer games is a plus

Please provide a portfolio showcasing your previous work.