in your list; provide job postings in their career section on their website in which you can look at opportunities and and apply.

Bear in mind that some of them have offices deployed all over the world and some of the positions offered have specific criteria.

Anyway try visiting their websites for details and also try in places like monstergulf.com; monster.com; bayt.com; gulftalent.com; and alike sites on the net.

Regards!