I really love this concept and hope it succeeds. Lowering the barrier to entry to highly technical fields is a win-win for everyone. Congrats on your progress so far!
My only question is how a highly productive individual at a top bank or startup justifies taking the time out of their day to speak to a newbie. I know they get paid, but I would imagine it's peanuts compared to their 6 figure salaries. What is their main motivation in scheduling calls?