QA Test and Debug a NodeJS / HTML5 Whiteboard -- 2

We have developed a live shared whiteboard application in NodeJS and HTML5, which allows multiple users to join a single whiteboard session and draw on a shared canvas. A lot of work has been put into it, but we would like to have it fully QA tested in all scenarios, and squash any bugs that might arise. The goal is to have 100 concurrent users using the whiteboard at once. Please only bid if you have experience with NodeJS and HTML5. Thanks!