The first two interviews were very nice and friendly, the home assignment was related to pure physics part and machine learning algorithms part, and afterwards a frontal meeting in the offices with the algo team lead (who had no team at the time...). The frontal meeting was scheduled to two hours about the home assignment, but although the team lead finished all the questions before time, he kept asking me questions just to be ghosting later on...He promised the hr will contact me for follow up interview, more than half year have passed and I'm still waiting. No need to say no one bothered to send rejection mail.