Congrats on launching. The site looks great.
Some feedback:
* On the browse page, you should remove the ninja after the person's expertise. It makes it easier for the expertise to stand out when scanning the experts.
* It wasn't immediately obvious to me that the green circle meant that the ninja was available now--maybe something more obvious if you want people to start a session in an ad hoc fashion vs scheduling a future session.
* It might be useful to show the people an onboarding page with the type of help you could get from these ninjas.