Greetings. My name is Jeremy Trammell and I represent a group of developers and designers in Portland, Oregon, in the U.S. We have extensive experience with Javascript, and with node.js, and would be happy to assist you with your project. The maximum number of concurrent sessions is controlled by the configuration of your server, and the response time will also be governed by the configuration and hardware of your server, but the process you have described is a relatively simple one so even running in Javascript your requirements should be achievable with a moderate server. Since most node.js applications will be developed for node.js, not for iisnode, you will not be able to install them on your server without first ensuring that they are compatible and possibly making some small source code changes. We would be happy to take that work on for you if you'd like, in addition to developing this package.