Welcome to doha, may your stay yield fruitfulness and prospectiveness in your career.

Regarding getting a job for MCA personals, it all depends. There are couple of options as follows :-

1. Once you arrive in here, you need to apply for a family resident visa, and when she joins you under your sponsor, she can start looking for a job. However, sponsorship change is a must if her company requires it.

2. You can apply for jobs prior to her arrival and once when scored, the company will sponsor her.

http://www.qatarairways.com
http://www.qp.com.qa/qp.nsf/jobs?OpenView
http://www.rasgas.com/rg/rgr/
http://www.hmc.org.qa
http://www.dohabank.com.qa/
http://www.cbq.com.qa/
http://www.aljazeera.net

Applying for career sections on these websites, you might be lucky enough to find one. However, somestimes it needs a push to get in...

Best of luck...