Meta | Phone screen | Rejected

Interview Feedback:

Result: Rejected

I recently completed a phone screen interview for a Software Engineer position at Meta. The interview consisted of two parts: a 20-minute behavioral section and a 40-minute coding section.

Coding Questions:

1. Sparse Vector (Implement the dot product): I successfully implemented the dot product using a hashmap. The interviewer then asked if a more memory-efficient solution was possible, suggesting an array of pairs. While I didn't immediately identify the more efficient approach, I did solve the problem.
2. IsPalindrome (Ignoring special characters, spaces, and digits): I successfully solved this question.

Overall, I felt confident in my coding abilities, completing both questions within the allotted time. However, I made a couple of minor mistakes and my solution may not have been optimally memory-efficient. I am unsure why I was rejected, as I believed my coding performance was satisfactory. The behavioral portion of the interview presented more of a challenge. I am curious if the emphasis on efficiency and other factors played a significant role in the decision.