Did you have to work on a state machine for this task?

Yes, as part of the task, it was necessary to develop a state machine to manage complex transition logic between the states of an object or process. This helps explicitly describe all possible states and transitions, which simplifies maintenance and extension of the code.

For example, in order processing, states can be distinguished as: "Created", "Paid", "Shipped", "Delivered". The state machine ensures that transitions occur only in valid sequences and simplifies error handling.