How does a workplace hire or dismiss members?
The exact procedures for hiring or dismissing a member would vary and be written in each workplace’s constitution as decided democratically by its members. You would expect that decisions over who to recruit would involve all workers the new recruit will work with, rather than the decision being made by only a few managers, as is the case with hierarchical organisations today.
In a participatory economy people are hired as members of a workplace with full and equal rights from the moment they arrive, not as employees. Everyone is free to apply for membership to the workplace of their choice, or apply to form a new workplace with whomever they wish.