Hello,
Sync-ing the fields between virtuemart and jomsocial should be straightforward enough, by developing a plugin which will implement this functionality. I'm not 100% sure, though, if it can be done without changing the jomsocial code. Most likely it is, but in the worst case scenario, i might need to add a plugin trigger in the jomsocial code. Just thought you should be aware of this.
As for my experience:
I have more than 7 years of experience with joomla, 10 with php. I have a perfect 5 stars rating out of 259 projects with a 97% percentage of completed jobs and a 43% Repeat Hire Rate. If you'll look at my profile, it should give you an idea about my skills :)
Thank you for your time,
Adrian