expert in solidity

Hi, freelancers. We are a small computer engineering company based in Bulgaria. We are looking for developers to join our team and work full-time.
https://docs.google.com/document/d/1uO61BBwLbnZhV-HulQmaj_wKjMZeZd0VKLiNKiFI2YA/edit
Here is your test task. We need only senior-level developers. If you are a junior, don`t waste your time. Thanks a lot.