I worked at home for a small startup that was saving money on an office. It worked out so well that we kept doing it for many years later after we became successful. We would find a spot to spend the day together once every two weeks. I started as a junior programmer and felt I was mentored effectively. One of my favorite programming memories occured when my mentor, a senior, introduced me to exceptions, which he had implemented in assembly language. I learned a lot from him, and never felt that not being in an office everyday, all day, with him was a detriment to my learning.