Restrictions for a board are taken from the underlying filter. If the filter is shared with a user, then the user will have access to the board. All you need is to create 3 filters and share them with required users. Then you have to associate these filters with the boards.
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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