UE5 Map Optimization Specialist

I'm seeking an experienced Unreal Engine 5 mapper to optimize a large 80 km² map for a multiplayer RP game. We've already used Nanite to optimize the meshes, but we're still experiencing performance issues and bugs related to the Water plugin, especially with the ocean.

Key tasks include:
- General map optimization
- Fixing Water plugin issues (lakes, ocean, collisions, reflections)
- Improving overall performance

Ideal skills and experience:
- Expertise in Unreal Engine 5
- Strong knowledge of Water plugin
- Proven experience in optimizing large game maps
- Solid understanding of performance metrics and debugging in UE5

Please provide your portfolio and relevant experience.