Thanks! For that scenario you can use .explode(). Something like this:

series_hiring_managers = df.explode('hiring_team.hiring_managers', ignore_index = True)

df_hiring_managers = pd.DataFrame([ * series_hiring_managers.pop('hiring_team.hiring_managers')]).add_prefix('hiring_manager_')

series_hiring_managers.join(pd.DataFrame(df_hiring_managers, index = df_hiring_managers.index))