They are more of a body shopper for PMC services than a real consulting company.Most of the work they do is construction management type only not much into design.I would rate them as an average middle eastern type of firm not an Atkins,AECOM or the like.In terms of salary you should get around 30000QAR per month(all inlcusive)depending on the value of your 13 years of experience(assuming you worked on some high value quality projects).Hope this helps you to make the right decision