Unreal Engine Realistic Game Development

I'm seeking an experienced Unreal Engine developer to help build my first game. The game features an AI doll that attacks players upon sight, a death screen, a 5-life system, upgrade stations, boss fights, and a coin currency linked to upgrades... (Budget: $250 - $750 USD, Jobs: 3D Game Art, 3D Modelling, 3D Rendering, AI Development, Game Design, Game Development, Game Programming, Mobile App Development, Unity 3D, Unreal Engine)