The offer seems reasonable and as per QP salary structure for a Systems Engineer. You willl also get WIA (Western Inducement Allowance) close to 3,000 QR and QP now also pays currency adjustment. So, it C$ becomes expensive as it was before, it will not effect you.

Now can you negotiate ? well if you try hard they may give you 500 QR more. Do not expect a big change in basic salary. It will not happen. QP has a take it or leave it policy.

Enjoy