If you have a resident uae visa and the profession in the visa is " ENGINEER"- be it any stream ,you can have a visa on arrival from the airport. The charges of this is QAR 100.00 and you need to pay this by visa/mastrecard at the airport immigration counter. this visa is valid for 30 months including the day of arrival . the same also can be extended for a month also afterwards. I dont think there is any restriction for Palestine citizens in Qatar.
Cheers