I am certainly both. What I have found is working really well for me is to have a co-founder who is a 'developer work horse' who takes care of most of the real

I am certainly both. What I have found is working really well for me is to have a co-founder who is a 'developer work horse' who takes care of most of the real development and finishes off the products. This frees me up to solve the major technical problems and do the 'sales'. I would say we work about equal amounts, just doing different tasks. Even though my tasks were the ones mentioned in this article, I know I would not be anywhere without my co-founder and I know I am not any more important to the company than she is. I guess then it would by my quick and unthought-out opinion that start-ups need three components, problem solving, sales and a lot of work! And that the work is at least equal to the value of problem solving and sales put together.