Sa, don't ask your company for business visa , it is an incompliance issue, you r not eligible for business visa. Whoever advise you to do so, advise you to violate the law. Also company might not like it at all. You as a Canadian can get visa upon arrival at Doha airport, which is valid for 1 month and extendable for another month. Once your hubs RP is finalized, he can sponsor you ( check this point with his company prior to traveling!) . As for changing a job, there are certain rules with regards to this matter. You as sponsored by you hub can quit/change the job any time. He can not change his sponsor any earlier than 1 (sometimes 2) year/s. If he got so-called no objection certificate (NOC), he can change the company with no problem. Ask him to check with his company whether providing a NOC is in their policy or not. If no NOC is granted, he has to leave the country for 2 years.