Yes I agree with you martin2doha. It's a bit scary having indefinite contract. other details are:

Offer Validity: Employee must resume to work within one week from the date of issuing the visa; otherwise this letter will not be valid.

Probation Period: 3 Months from the day of starting the work.

Notice Period: For Resignation 1 Month.

Air Travel: Vacation & Free Economy Class Ticket, for the sector of Doha-Manila-Doha, upon completion of 24 months of service.

Health Care: As per Qatar Labour Law.

Effective Date: From the day of resuming the work.

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jhonkarl, I also agree with you. my previous salary is a bit higher than this offer. And I also do believed, that this company (Gulf House of Trade...) is just a small time private firm involved in Qatar Oil & Gas Projects. Can you investigate on their Co. Profile?

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There are also other offer(s) from 2 companies:

1) is National Catering Co. LLC, UAE with basic salary of AED3500 + AED550 (Mobile Allowance) working as QHSE Officer.
Benefits: Free Accommodation, Transportation, Food, Laundry and Mobile.
Standard Package: Vacation (yearly), Health Insurance

Agency: MSS Talent International Agency
Terms: 1 Month Basic Salary (Placement Fee) + PHP8000 Processing Fee.
Agency Status: Preventive Suspension

2) is Kentz International Engineering & Construction - Project is based in KSA with basic salary of US$848 + standard overtime pay working as Safety Officer.
Benefits: Free Accommodation, Transportation, Food.
Standard Package: Vacation (yearly), Health Insurance

Agency: East West Placement Center Inc.
Terms: No Placement Fee and Medical Fee (reimbursed by the Co.) but Processing fee is PHP2500
Agency Status: Licensed and in full operation

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However, my passport is still in France Asia that holds me back to process my other applications. Work Permit for Qatar (Sponsor: Gulf House of Trade...) has just arrived yesterday. Any inputs, Thank you.