Write an across platform APP for kids english and math teaching, and cloud server for admin

I need to see your proposals, type I will send a proposal at the beginning if you would. Write an across platform APP for kids english and math teaching, and cloud server for admin Basic functions and needs as below: I would like to discuss it with you and I also expect you suggestions. 1,Write an Mobile APP (across window phone, android phone, IOS phone platform) for kids english and math teaching( USA course Preschool - 8 ). 2. Basic framework and logic for customers ( students ,parents , teachers and schools) should at least same as XtraMath’s app(you can find XtraMath and refer this APP’s customer logic ), you can understand that I expect Xtramas also support english training . (XtraMath not only support individual customer,but also accept group registration. That is a very clear logic in this platform ) 3, Customers use Wechat ID, email and cellphone number to register and create an account ,at the same time customer can make a payment with a coupon code on this APP. (for example: we will gave customers a trial term for any customers, the system will automatic reminder customer to make a payment before 10 days to the expire date) 4, Both customer’s cellphone and cloud serve will save the their study progress every day, so they can continue the study from last login. 5, APP should support kids (preschool-8 grade) study english with multi-form( according a letter, pics,audio, sentences, paragraph to fill an right letter, sentences, words; to make an right choice.) practice english phonics, words ,sentences and logics. 6,Cloud server for administration (support Upload and inputting audio, pic, multi-language english, Chinese,Japanese,Korea, Thailand... ) . 7,Cloud server system request support automatic homework assign by calendar. Once customers successful create their account and made a payment successfully, base on the customer’s shopping item, cloud server will automatic to email them the register info, and at the same time send their related homework or textbook. The customer can access to the system after they receive a successful register email. 8,Cloud server could show me customer’s register details ( email, cellphone number, Wechat ID, Kids age, how many kids under one parents. what courses ordered and account expired date, Who are not complete the register? what role are they students,parents,teacher? how much do they have paid? what coupon do they used in their registration? ..…) , so that I can check it by each item. 9, Cloud server can automatically create student ID for each of student. Student ID also can be using as a coupon in the marketing [login to view URL] can Identify a right coupon and accept different Coupon register. 10, You will responsible for app development,deployed in Ali cloud and any associated art design required using my logo to make the final jpg image look professional for my customers(I suggest you refer google’s design style-simple and easy using). 11, clear code Some friendly reminder as below 1, Do not use any google’s service in this APP, Because it doesn’t work in China. 2, Wechat SDK download [login to view URL] 3,full source code is required 4,Education APP Developer experience and Similar demo APP will first consider. 5, Baidu developer: [login to view URL] If you have a similar experience in the filed. please email me and share me a demo with your successful APPs what you have developed. I look forward to answer your questions about this project.