Hello,
First of all let me just state that your project sounds very interesting (regarding the technologies involved) and I would definitely be interested in a long-term collaboration. I am a very fast learner and keen on exploring bleeding-edge technologies.
I have a strong background in Javascript, considerable experience with Angular.js, and a fair experience with Node.js. I've also played around a bit with the Mean Stack, so I am somewhat familiar with Express and Mongo. As for PhoneGap or Cordoba, I do not have any experience with them but this should not be an issue since they are mostly wrappers of HTML5 technology (I do have some mobile development experience on Android though and I am sure I could be up to speed in a week).
As for your other requirements, I have no problem in communicating in English and we could communicate via Skype daily (my time-zone is GMT+3, so I may not be available later in the afternoon US time).
We could start part-time, 20h/week, which will be done mostly throughout the weekends (I have a full-time job), and if all goes well we can move to full-time (40h), but no sooner than 1-2 months.
Looking forward to an interview for more details :)
Best regards,
Alex.