Ruby on Rails developer to create admin page

I'm seeking a ruby on rails developer to help edit existing admin pages on a ruby on rails api. This program powers a gmail plugin and I'd like to have better stats that show me the health of the user base. I recently acquired this app. The first part of the job will be to review the code base and look for existing statistics and pages. There is a reports page but I feel it's wrong data. So we'll look at that and see what's wrong first. The next part is to make a new dashboard for understanding the current user count and usage of the app. I'd like to be able to see new users and how many convert to paid. I'd like to finish this project as a viewable dashboard that shows relevant data.