Ghosted after 4 interviews. Few rounds of normal general, interviews, followed by technical challenge/demo of actually using the product. Not too difficult from technical standpoint but I also had some issues and apparently (they didnt tell me this) they could see the erroneous calls to the API that I was sending. Bit of a red flag if you ask me. Unfortunately Sightcall or the recruitement agency they used, is one of many companies that ghost candidates in spite of promising and long interview processes. Shame on you both.