The interview process started with an home coding exercise. After two weeks I received a positive answer, thus a second interview should have been scheduled. I gave my availability for 2 weeks and also my availability to fly to London, when the person who I was in contact with suddenly disappeared and did not answer to my emails. I let summer holidays pass, then after 2 months from the first interview step I sent another email to him and I didn't get answer. Eventually, I emailed the HR and the previous person finally gave me some apologies telling me that it was fault of some previous HR employee and that the position was filled. Totally unprofessional.