Javascript developer needed to build chat widget embed code

We are looking for a experienced JavaScript developer who can build a plug-gable embed code for our chat widget. We have developed an app based chat application which can be used on browser also. We want our customers to be able install/run our application just by copy pasting embed code into there website. Just like any chat widget ([login to view URL]), where they provide an embed code, you paste the embed code in your site and chat opens, like wise we want to create a widget for our application. we will share a embed code to our user. Once they paste the code, our chat widget should pop on site on right side corner. -Developer must have knowledge of creating embed code widgets -Developer must be able to write whole JavaScript code to handle chat and communicate with existing APIs -Code should be flexible and should follow standard practice -Developer must have knowledge of security and practical implementation -Developer should have 4-5 years of experience -Developer must have worked on project with same kind of requirement