iOS app for Crypto Signals with membership

ONLY SERIOUS CODERS/PROGRAMMERS. ONLY ENGLISH SPEAKING I'm looking for someone to make the following app: It's an app where I can post news and signals for trading on bittrex and also Binance (users get notifications when I post news or signals). the APIs from these two sites need to be implemented -Users can login or sign up (an account can not be accessed by two mobiles at the same time!) --> there needs to be a log of each account (which mobile, which country) --> so users don't share paid accounts between them!! -Once logged in they can view the news that I post in the news tab -Free signals in the Free tab, and Premium signals, in the Premium tab -Free users cannot access Premium tab, they should get a message: to get access please contact admin through Telegram (I will accept their payments in cryptocurrency) - I will manage the subscription of the users. I will change their subscription dates, their badge (freemium/premium), I can change their password (incase they forgot). - News posts: title, author, post date & time, text style (bold, italic, underlined, headings), quotes, links and need to be able to post pictures, embedded videos from youtube. - Signal posts: market (for example LTC/BTC), link to the market, Chart of the specific cryptocurrency mentioned under the signal (chart from Bittrex/Binance Exchange) - when I post new signal = user gets notification on his phone. When the signal status changes to Reached or Failed/Pending (= user gets notification). -Custom sound for signal notifications and news notifications - Users have a profil: his username, change password, change email, Badge = freemium/premium, and Support links, if they need to contact me (facebook, telegram, instagram, email) - User subscription history My only question is: is it better to have the admin panel web-based or in-app? (what is the best option, and why?) If you have better suggestions for the app functions and the app design, please let me know.