Dropbox Machine Learning Engineer interview questions

2 take home coding challenges through code signal, 1 behavioral interview, and a final round interview. The final round interview is 5h long and expect interviews to be as hard as other FAANG companies.

Recruiter reached out over email. During our chat, I told her about my specific skill set and that I was interested in applying for a Machine Learning Engineer role. She acknowledged it and said that there are multiple such roles open. 1 hour Phone interview was scheduled within a few days. The phone interview went well -- I solved the problem with an optimized solution. The interviewer and I also had a nice chat about the challenges that the company is facing. After this, there was silence from the recruiter. After about 2 weeks, I emailed her and asked about the next steps. I received a standard reply saying that the "phone screen was very good and the interviewer was impressed by my skills. However, I am not a fit for the 'full stack role' that they are looking for". Seriously?? Why would you even consider me for a 'full stack role' -- when I had specifically mentioned intention, my skills set and expectations upfront. Why waste everyone's time? Not just mine, but of your own employees? (Btw, Dropbox still has multiple roles open for Machine Learning Engineer on LinkedIn)