Development

I’m relatively new to Jmeter, but I have a scenario, that I’ve not been able to figure out where I need to perform the following:

All user log in to application with a ramp-up period of 15 seconds between users.
No activity continues until all users log in to application.
Once all users are logged in, perform their set of business activities (will vary depending on business process, and based on iterations, not a time loop).
Once all users are complete business processes, users begin to logout with ramp-down time of 15 seconds between users.

Is this possible to configure my script to execute this way and if so, how? I have tried use of Once only controllers, loop controllers, constant timers, and some various plugins (Custom Thread Groups). I’ve also viewed various threads and not been able to find this exact scenario, but cannot imagine this is an overly unique test case.
Any recommendations or advice is appreciated.

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