1. Why Yelp
2. Go through resume. What project did you do in your internship. What is the biggest challenge of it?
3. Web sever is slow or down, what may be the reason?
4. What is your favorite programming language and why?
5. How will you improve that language?
6. Coding: Longest Common Prefix.
Write a function to find the longest common prefix string amongst an array of strings.