We do sponsor visas, and I believe our European offices are also looking for engineers. Please email jobs@ghs.com for any US inquiries, or jobseurope@ghs.com for European inquiries.
As others mentioned in this thread - H1B cap for the current year has been reached. So do you sponsor another type of visa or wait for the next year before onboarding the new employee? In the latter case, maybe rem0te contract is possible (during this waiting year)?
There's some additional information on our website: http://www.ghs.com/jobs.html