HI,
See my portfolio project Scene Manager. It is Exactly like your project. You need not to worry.
I have worked on Game Engine Design, Game play Design, Artificial Intelligence, Multi player Unet, Virtual Reality, Particle System, Memory Optimization, Quality Optimization, Shader Graph and Tile Map. I have been working on Game Development projects for two years. I hope to get an opportunity to work with you.
I can provide you Complete
1. Game Engine.(all the data saving high scores, coins, shop).
2. User Interface.(Starting panel, Game choosing panel).