Shopify Senior Software Engineer interview questions

Interview process was generally positive. Recruiters were responsive from start to end. Pair programming interview questions were very down to earth, not something like implementing a binary search tree or so. Communication was easy with the interviewers. On technical deep dive interview, interviewer requested me to talk about a recent project. In a short while it felt like he wasn't satisfied with the project I chose and seemed like he wasn't really interested in. At the same time, he was constantly smoking his e-cigarette while we were interviewing and it made me feel strange. I think it would considered as an inappropriate behavior by Shopify & this interviewer if the candidate was smoking instead. Interview feedback I got for this last interview was like written for somebody else, didn't sound like what I talked about in this interview.