if your planning to bring your family here then you need a higher position.if you want you to pursue the job offered to you there is no problem even if the position on your QID is "Guard". I myself change my position mentioned in my QID to my current position right now in our company. if your HR & PRO is cooperative and helpful enough they can do it to change the position on your QID later and it will take 2 months for this process. Required documents to change position on QID:

1.) Diploma to be translate in Arabic
2.) Salary Certificate
3.) 6 months bank statement
4.) a letter from the bank stating that you have an account on them.

You can get advise and ideas to your HR / PRO. Hope this will help you.