Meta Software Developer interview questions

The interview was a phone screen; the first 10-15 minutes asked me about my research, and then I had to code a palindrome detection algorithm. I answered the question eventually, but I had a couple of bugs while writing and this did not seem to please the interviewer, who wanted to ask follow-up questions.

I had applied online for a summer internship. Recruiter reached out to me and scheduled phone interview. I got through first round phone interview. Second round was also phone interview. It went pretty well but I did not get an offer. Interviewers asked some basic questions about my background, projects etc. Then they spoke a bit about their background. Interviewers are friendly and helpful.