Skillz Software Engineer interview questions

Applied online and contacted by technical recruiter. Initial screen and assessment was straightforward and positive. Asked about my experience/interests and if I could take an online coding challenge. Coding challenge consisted of some debugging questions involving multi threading. Received an invite for onsite and told to prepare for a system design question. Show up to the on-site and get asked about what technologies I know for about 45 min by two recruiters who seemed rather uninterested. No coding/white boarding challenge. Then spoke via Skype with another HR person about culture. Then met with Manager and spoke about culture. Received automated rejection email a day later. Seemed reasonable since they didn’t actually assess my ability to problem solve. I guess it’s more important that an engineer knows mongoDB. Most likely bad timing for the company.