Auto trading on bitrax and yobit exchanges

Hi I need a simple Buy and Sell bot for trading on bitrax and yobit exchanges. All provide a full public API. The requirements are quite simple. It can be php/web based. In your proposal, please specify the language you will use, and what experience you have with cryptocurrency. The currency pair will always be xxxx/BTC (where XXXX is the currency to be traded). I need on off button if i click on button trading will be start if i click off button trading will be stop. You must provide full documentation, all files and install instructions for using the bot/script and before releasing payment you must send me the code to check, and test live against with my API Credentials. You are required to fix all bugs, even after payment is made if something is wrong with the solution.