it was in total 3 skype interviews most of them repetitive. lastly final interview was with customer as this is a consultancy, customer needed had final say. so really i didnt get the job until customer agreed

Interview was very fast and asked to the point questions. They asked me to describe the Yocto recipes. And the questions were more towards how will you lead a team of people. Verbal offer was given. When asked for written offer they declined and dropped the offer. Don't ask for written offer. Assume that the HR do not trust you.