Service for drawing up a sequence of actions between two users?

Question

Software and Internet Services

Hello,
I'm interested in a service that can offer this or similar functionality.
I'm mentoring a little, and I want to do the following thing.
For example, I create a task, a person solves it, clicks on the button - "solved". -> in response, he receives a file with a test for the task. -> he tests, tested and takes the next step -> tested/fixed -> he gets a solution in response.
Does anyone know what can be done to do this? I know that there is a similar thing in the Google classroom, but only the first step can be built there, but I want automatism. ))
Thank you!