Multiplayer FPS Game Development on Unreal Engine

I need an experienced Unreal Engine developer to enhance my multiplayer FPS game, which is fully developed but requires improvements and performance optimization.

Key Tasks:
- Game Mechanics: Improve existing features and optimize performance.
- AWS Integration: Connect the game to AWS Amazon Game Lift services.
- Microtransactions: Implement Handcash connect for microtransactions.

Ideal Skills & Experience:
- Proficiency in Unreal Engine 5.5.4
- Strong background in FPS game development
- Experience with AWS Game Lift
- Familiarity with Handcash and microtransaction systems
- Performance optimization expertise

Looking for someone who can deliver high-quality work efficiently. Please provide relevant portfolio and estimated timelines.