At the moment there are two engineering positions open in the VirtualBox team, either in Ireland or Russia.
We're looking for people working on new product features, covering all areas of VirtualBox on the host and guest OS. Broad system programming knowledge and some kernel level programming experience for one of Windows/Linux/Solaris/Mac OS X are the key skills besides flexiblity. VirtualBox has challenging tasks for everyone and no two tasks are the same.
If you're interested go to http://jobs.oracle.com/ and search for VirtualBox. For any questions send me a