Wayfair Software Engineer interview questions

Applied in June, 2013. on the company website. Contacted by recruiter in October. Had an initial phone interview with the recruiter about my availability and was asked difference between inner and outer join. Next was a phone interview with software architect. he asked me about my projects, was asked to write two sql queries, fairly simple. Describe the whole process that happens when you type www.google.com. Next was two Skype interviews one with senior engineer and the other with associate director. Was asked to write a program to convert a number to words like we do on checks. Asked how I would optimize it. Performance tuning? Projects again. what is your thought process of designing a website? What security issues you will take care of(sql injection, cross site scripting, cross site request forgery). Was asked 3 puzzles because I already new the first 2. Bridge and torch puzzle.