Interesting concept. There are a lot of cv builders on the market, building some high quality premium cv's could be a viable business but getting noticed is quite hard so pushing the LaTeX angle on the site might be a good way to find a niche.
Thanks a lot for the feedback :) we have been thinking on how to push it. Its time saving, quality is amazing. We want to leverage LaTeX usage but people outside academia are not very aware of it. But we will rethink about it!
What about markdown? As long as the service is new, I would be scared of having my CV depended on your app. Yes, I know LaTeX, I also know it's a pain to set up if you are applying "non standard" formatting.
By the way, I don't know where are you from, but this tool looks cool enough for Nordic countries. In particular, you could target easily carrier centers in Danish universities (http://bss.au.dk/knowledge-exchange/career-centre/). These centers offer free advice for students' CV. I see this service being advised or even used there (like the students upload his CV on the system and gets help virtually).
Thanks a lot for the pointers :) we will try to see if Danish universities would be interested in us. And for being dependent on the app. Yes you will have to depend on us for the awesome templates we will provide and you will not feel bad about being dependent! ;)
oops sorry for the premature reply. too much hap in a day :( a wysiwyg / rte is something we worked hard towards since that was the most easiest way to fill in data. we will have a closer look at it and get back.
(disclaimer I am the cofounder of sharelatex.com)