Could you possibly name his personality traits? This is also huge factor in choosing countries cause something as adapting to its culture can be quite challenge.
In any case, I won't suggest choosing Lithuania for any solid reason as politics(namely, thieves) are burning it into ground already fine enough. Here he could make career but unless he has traits of Lithuanian dude who usually in automotive field is very selfish etc. wishes a lot of money for small fixes in vehicles.
That's one Europe country I would sign off my list if I was him. Right now, it's not best time to come here since Baltic countries themselves are in a kinda possible-warzone. From my friends recommendations: Denmark, Norway, perhaps even Netherlands are best choices if you were to take Europe in count as well as UK.
Can't say bad things about Canada myself - seems peaceful country to me.
What else I forgot to mention... correct me if I'm wrong about other countries(besides Lithuania) though.