SurveyMonkey interview questions

I applied on the website for a data science position. I spoke with a recruiter and thoroughly enjoyed that conversation. The recruiter made it clear that Survey Monkey is a great place to work and has a great culture. However, for some reason the recruiter seemed to believe I was a "not quite junior but not senior" candidate -- I have a PhD and four years experience in data science. I should have corrected her, but I was so thrown off by her mis-assessment of my level that I didn't react at the time, thinking it would become clear my level of seniority at a phone or onsite interview, or when an actual data scientist looked at my resume. For the next steps, they had a junior data scientist (master's level with one year experience -- Survey Monkey is his first job) interview me. We discussed how to design an algorithm for detecting spam. I liked the conversation but was a bit uncomfortable with the fact that they had someone so junior interview me. How on earth could he tell whether I'd be a good candidate for a senior position? Finally about 1.5 weeks later I got a form rejection (i.e. not personalized) email saying "thanks for giving us a chance to consider your resume". Do they always do this after a phone interview? It sounded like something you would send if you never spoke with the candidate at all. It was such a bizarre process to me. It seems like they never quite took my application seriously. I also think I may have undersold myself a bit and it's a lesson to be more aggressive about my skills and level of seniority earlier in the process.