Collocations for trainee - noun

management
graduate (esp. BrE)
Many companies recruit graduate trainees to train as managers.

new

employ (esp. BrE), hire (esp. AmE), recruit (esp. BrE), take on (esp. BrE)

work

accountant, manager, nurse, solicitor, teacher (all BrE)

as a trainee
She joined as a management trainee.