Survik Software .NET Developer interview questions

HR did the initial screening. He asked me .Net design patterns related questions. I don't know whether he understood my answers going by his HR experience. Then other 2 technical rounds were organized. The problem here is they ask for your original degree certificate after you join them. They say, they need it for background verification. If this was the case, they should have disclosed this at the time of interview. Beware about this.