Can I change employers while on a Romanian single permit?

Your work authorisation is linked to the specific employer who sponsored you, so you cannot simply move jobs and keep the same permit.

To switch, the new employer must go through the work-permit process again, applying for a fresh notice of employment for you. A fee applies to this new application, and the usual labour-market and quota conditions are reassessed.

Until the new permit is approved, you should not start working for the new employer. Planning the transition so there is no gap in valid authorisation is important to keep your residence status secure.