Best way is for you to contact your soon-to-be employer directly.

They shall fill you in with the requirements. If you really want to get this job then you can do that or fly in to Qatar with a tourist visa. Although you will have a limited time to look for a job, you can have options on which job you want to take and of course decide properly on the salary. It's risky but more often than not, I see a lot of Filipinas doing this.

You can do that! ;) All the best to you though!

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╬ Sotally Tober ╬