Now I understand. Visa stamped in the passport is mandatory. As tourist make sure to show a round trip ticket to phil immigration officer or else you will not be allowed to leave Philippines. If the employer will pay for the plane ticket, then good for you guys. Best of luck.

If I were you , I would rather go through POEA. All you need from your employer is a copy of contract for you to accept and the rest of documents will be obtain in phil. It takes 1 week or more to authenticate the visa. while waiting for the authentication you can have the medical test in any accredited laboratories by qatar embassy. If you fail the medical test better not to come here in Qatar Go to POEA and ask all the documents you need to have the OEC. If you have all the requirement it should only take you 2 days to get the OEC.