I have recently got a job in a small department of a large company. A colleague who manages the office has given me access to the local sharepoint and there I could find, in the open, job descriptions for roles other people in the department have. To my surprise they had advertised the same salary grade I have, for jobs less valuable than mine. I find this unfair. Can I talk about these findings when I ask my manager about a pay rise?
I also have to point out to you that the jobs may not be less valuable than yours to the people doing the hiring. People often have an unrealistic view of both their own value and the value of postions in other specialties.
Further, I have said this before and I will likely need to say it again. Get this through your head. Salaries are never fair. They are a function of alot of things including race, sex, marital status, how hard it is to recruit, your starting salary when you got the job 5 years ago, the salary you made in your previous jobs, and how well you personally negotiate.
If you want more money, never try to base it on what others are making. Base it on the value you bring to the organization.
I also want to point out that the chances of getting a pay raise when you are a new employee who has not proven any value yet to the copmany is pretty much 0%. And most managers would be angry at or disapponted with anyone asking any earlier than 6 months and preferably a year into the job. By asking now, you would get a poor reputation in the organziation. You accepted the salary. Deal with it.
You have two problems.
Most companies don't want to discuss different rates for similar job descriptions. They can base the different rates on their historical ability to find people at that rate. They can even base it on region of the country. If they are a government contracting company they can base it on what the customer is willing to pay for those skills. They may not even understand why the government sets the rates at the level they do but they maximize the rate they can charge, and pay the least that they can under contracting law.
The bigger issue is you can't say: Joe let me have access to a set I files I wasn't supposed to see. I read those files, made copies of company proprietary data and didn't secure them, and now want to use them as leverage to get a pay increase. If they don't fire you right away consider yourself lucky.
Unless you know they discriminated against you, or a protected class of people, it will never get you a raise.