In the task of front and back. Whom to appoint as the executor or to break it into several?

Question

Task Management

Several performers participate in the task - front and back. During the development process, they kick the task between themselves as their part is ready.
What is the best way to do it:
- make 1 task and make everyone performers
- set the performer to the one who is currently working, and remove the rest
- break the task into parts by performers
- other
It is the aspect of communication and understanding which side the "ball" is on now there was no downtime in solving the problem and everyone knew that they could start doing their part.

Answer 1

If the task cannot be solved in 30-60 minutes by one person without coordination, it needs to be divided into subtasks
Tasks can theoretically be allowed to be fired twice - between the tester and the developer
After the second time, if such a task does not close, you need to take both and put them in one pc and make them solve it
In a front-end/back-end pair, you need to go from the task
If the task is difficult for the back, then the back should offer api options for the common super-task, and the front-ender should correct and indicate
After agreeing and writing a draft api, they can perform each of their sub_tasks independently from each other
If the task is difficult for the front, then the frontender must specify the api, coordinate the timings with the backender and write a draft api
Balls are always either at work or on the shelf

Answer 2

In my practice, such moments are well solved by a checklist in a common task (one for all and broken down into points) and communication in a chat, i.e. the task is not thrown over (items in the checklist are closed), and all emerging issues are resolved online in the chat.