Need WebSite developer/programmer (front and backend) with multi-language support

Hi! We are looking for a talented full stack programmer to build our our subscription based product. That involves converting all our physical books, which use our Read Think Do method, and making them available in digital format. (Desktop and Tablet friendly) We would be very happy to work with someone who has expertise with the MERN stack. All the wireframes and mockups will be designed and provided to you by us. Here's a quick view of what we are looking to do: -We create actual books that have challenges/questions in each chapter. -The questions need to be answered before the reader moves on to the rest of the story. There are no right or wrong answers. Our program is about helping children learn creativity and critical thinking. -We want our program, which is now in book format, to be a digital subscription program. - The user will be the child, but there needs to be a way for parents/or teachers to monitor the progress and leave comments. - Parents will sign up for one of the subscription programs (we would like to have 2/3 options) and will pay for it. Their child will then be able to access the program/books according to the subscription the parent selected. - As the child reads the book, they will get to the point with the questions/challenges. They will need to type in the answers which will allow them to move on to the next part of the the chapter/book. Note: There are not right or wrong answers. As long as the kids types in a sentence, they will be allowed to move on. - There should be some sort of rewards collected by the kids as they progress. (coins or tokens) - On our end, we (the company) need the ability to be able to add books as we produce more and more. - and there is a premium option section which provides additional questions for the kids (this is not a standard feature and the kids do not have to answer this section to move on. - Attached are two different examples of our books to help provide a better understanding Looking forward to hearing from you and feel free to contact us with any questions.