Hi, I'm Selenium automation expert. I have gone through your requirement as assure you that i can perform this task quite well. We will be using Selenium webdriver using java and testNG to create the scripts. I'll design the framework in such a way that it will take the input from xml/excel file. As you have mentioned 4 accounts, that we can do very well. I'll create the scripts exactly according to your requirement. Regarding cloud implementation, we can use Jenkins, as it is continous integration tool, we can integrate the selenium scripts with jenkins and it will automatically execute the scripts at given period of time.
Looking forward to get hired asap. Thanks