Simple web application to display picture tweets.

Hello fellow freelancers. I need someone to write me a quick application to display a photo when someone tweets a specified hashtag 1. User tweets his picture with #eventName. The engine should be able to take anyone who posted this hashtag, and apply a bar on top of the image in the middle with the hashtag in text. (kinda like snapchat) 2. The result should be displayed on a website that flips the image every time someone tweets. after 30seconds if no one sends a tweet, it should display a default image. 3. The new image should be tweeted back at the original account.