Java expert - complete my task in 3 hours at a pre-agreed time

Need a Java expert to complete my task in 3 hours at a pre-agreed time. You will be provided with sample tasks in order to see, what kind of task to expect. The task will need to be completed in a 3-hour time-frame, after a few days. You need to be good at programming and have a deep understanding of concepts such as polymorphism, methods, inhertiance, law of demeter, Liskov Substitution Principle, Strategy Pattern, State Pattern, Iterator Pattern, Template Method Pattern, etc. You need to have a good understanding of generics, concurrency, code smells, threads and refactoring techniques. More to be discussed in the chat.