One employee for two positions

[atinajero]

A employee will work for two companies within a group of companies, I need to know what is the best practice in SF to be able to do this. She is currently hired with a position and a company had thought of creating another user but by standard it only allows one per person and instance

[nlgro023 · Accepted solution]

What are you referring to? Because nothing comes to mind when looking at the word collaborator (not a term that rings a bell for me in SF).
Generally speaking, it sounds like you could use the concurrent employment feature (that allows the user to have 2 users. hence 2 companies/positions that have 1 common person-id-external).