Tourist/Visit visa here is only one month but transferrable if you find employer. Please note that the processing of transfer of visa would take minimum of one week. You need to get a job within 21 days to assure you will not go back home to your country of origin. I also heard that you need to have at least USD 1,500.00 cash money to show in the airport immigration here in Doha (specially Filipino) or a credit card (sometime they will check your credit limit to ensure you can sustain a month stay here in Qatar)... Most of big and good companies here in Qatar do not entertain walk-in applicants, I advice you to apply online and send your resume to all known companies here, they might have an requirements and will give you visa and ticket but be sure you cancel your KSA visa before coming here in Dubai for work. Immigration department might ask you to cancel your KSA visa.