Cross-Platform Realistic Open World Game

I'm looking for an experienced game developer to create a cross-platform open world game with a realistic setting that can be played on PC, Console and Mobile.

Key Requirements:
- Development for PC, Xbox, PlayStation and Mobile platforms
- Create a realistic open world experience
- Ensure smooth cross-platform functionality

The game should focus on the following elements:
- Exploration: Detailed and immersive open world for players to discover
- Combat: Engaging combat system that fits the realistic setting
- Story-driven missions: Engrossing narrative that drives player engagement

Ideal Skills:
- Prior experience in developing open world games
- Proficiency in multi-platform game development
- Strong understanding of realistic game design
- Ability to incorporate engaging gameplay mechanics

Please provide examples of previous work in the proposal.