Read the Labour law download it from Hakomie web site .i think in Labour Law there is an Article which indicate that during urs Probation period u can join another company without deporting check it if i am no wrong i have studied b4 2 months ago .if it is then come to Doha and during urs probation join other company .but it have some Risk but take it buz if u dont take risk in urs life u ll naver succeed .
cheers