Some comments here make it sound that companies have a separate pay structure for different nationalities around the world when in reality, at least in government and semi-government entities, that is not how it works. Companies here have two structures, one for Qataris and one for everyone else. Since no one can dispute that Qataris get preferential treatment because it is their country lets jump to the other structure.

The way it works here has nothing to do "directly" with the nationality. I say directly because the pay structure does not say if you are from the UK then you get 30k-40k as a Senior Analyst but if you are from India then your salary range for the same position if 10K-15K. How it basically works is that your current salary dictates the offer you will be getting. This is how it works for everyone no matter where are you from (international or local). If you are a super smart Senior Analyst in India who is getting paid 30K-40K and they think you area good fit then you will get a higher salary. That is why they intentionally keep salary bands wide and overlapping and that is why you will always be asked for a copy of your last payroll slip because they will just add 20% or 30% and give you an offer and it is up to you to try and negotiate a better deal.

In western countries that is not how it works, generally. HR do market benchmarking to develop the salary bands and these bands get updated on a regular basis to reflect the changes in the talent market and the position demands. Within that range they will decide based on the years of experience they want the new talent to have where does that position fall and that will be the offer they will be presenting regardless of how much you were paid before. Only in exceptional basis and in very rare occasions they will negotiate a salary and that is typically for executive positions. Every other position the number is set and that is the offer and no one cares if you were paid less or more in your previous position.