Hi,
Just saw your project requirement for an expert JS developer. I have 6+ years of industry experience in building great web applications using many front end frameworks (Backbonejs, jQuery, React). I can work with you on this aspect, but since you haven't specified what the exact scope of your project is, my current bid amount may change based on how the final requirements come out to be.
Feel free to ping me and we can discuss further.
Thank you