Wordpress & E-Commerce Expert required

Urgent required: Wordpress developer to make changes to existing website Details: Wordpress developer required to make changes to existing website, must have good experience working over twilio API and bootstrap. Video 1- Tasks: 1 - fix responsiveness on the ad page, two ads should be shown in each row. (second image is being cropped) 2 - the button "click to see how it works" is not working (not clicking) as mentioned by the client it used to work before but now it does not work. 3 - website load very slow (needs to be improved ) 4 - need to have image slider like in the example ( [login to view URL] ) on our website for each add and the slider should slide automatically 5 - The image thumbnail should show how many images each ad has. 6 - need to add sticky buttons (call/chat). The functionality that will come with these buttons is already present 7- Under each user profile name it must show the registration time for that user i.e. (registered 3 years ago) etc Video 2- Tasks 1- Register page/popup: when we enter the phone number twilio api sends us the verification sms from a random number. Please check whether there is an option to make it so that instead of a random number the message sender should read " [login to view URL] 2-User profile: we have an option to enter the phone number, we would want that phone number to be verified like on the register page before saving it against the user. (We have twilio purchased and implemented) 3 - A section where we can send custom text messages to the users (we have phone numbers in the database) just a section that contains message type (email/sms) and text box where we shall type the message would be fine. example will be shared 4- we have an option to 'Contact Seller'. Its working fine, as it messages the person and if the person is offline it sends an email instead that '<first person> is trying to send you a message etc. Same needs to be done for the sms. 5- In mobile view we need to put the links to 'download the mobile app' Video 3- Tasks 1- The buttons (call/chat) -whether logged in or not:when the user clicks on 'call' button, a pop up should show (as shown in the video) and after that when the call button is tapped/clicked the user should see phone dialer with the contact number on it ready to be dialed as shown in the video -chat button should only work when the user is logged in. the functionality behind the chat button is already there.