Meta Senior Software Engineer interview questions

Recruiter reached out - was not a direct post application. Recruiting team was very organized from day 1 to the end of the process. How will the process be, helper materials, even a webinar session to clarify any questions, what will be the next step and person I'll be in touch, etc. Accommodation was great. Very convenient stay and (again) very organized welcome next morning. 2 programming sessions - moderate level. 1 behavioral session - very good communication and chat for 45 minutes. lunch break with another engineer. 2 design sessions - moderate level. All the interviewers were so helpful except the one engineering lead in one of the design sessions. Actually that only session caused the interview to fail since instead of getting whole design approach and maturity, interviewer concentrated on solving hash logic :( Design sessions are very important to observe many dimensions about a candidate. And, since we stuck on a basic/very detail part of it, he'll not be able to observe other topics in such a broad area.

I was contacted repeatedly by the same recruiter on Linkedin. I ignored it at first because I didn't have time to do interviews. I have a job with a reputable company already. When I finally responded they started the whole interview process. I did a phone interview, and two onsite interviews (coding and design). It took two trips to FB campus and overall several hours of my time. I had to take time off work because those interviews are done during regular office hours. Couple weeks have passed and there has been no follow up despite my contacting the recruiter asking for feedback. Not even "thank you for taking your time to interview with us" message. I find this outrageous. Facebook, this is not how you treat people and their valuable time.