Dexcom IOS Developer interview questions

Applied through their portal. Was emailed a technical question along with a self recording question. Submitted my answers and got a call from a hiring manager a few days later to schedule a conversation. Spoke about my background, interests and resume. For whatever reason he got confused and said I'll have to take the online assessment; called me back saying that I already did... The next step was a phone interview where I spoke about my experience, projects, etc. They called me back for an on-site interview a few days later. This process was 4 rounds of 2 people each. Received a call from the recruiter saying that I didn't get the job, although everyone seemed very positive during the interview.