If you are a VirtueMart Professional or looking for such kind of expert, VirtueMart Job Board is the place to go.
As a developer, you can browse posted project and take it up. Search by keyword or use specific filters to easy find a job you'd like to apply for. Don't forget that you can subscribe to the job feed or to the job's newsletter to stay updated!
Otherways, if you are looking for someone who is taking care of anything regarding your VirtueMart website, just hit the "Post a Project" button and with just 15$ you can have your request posted for 30 days.You can set a budget for your work and set a time limit too.