Nitish, salaries in IT are amongst the highest in Poland. A senior developer can earn 20,000 PLN gross. However, no matter where you are in the world there are certain factors that are the same.
The salaries are highest for senior developers and four years experience only puts you at mid-level at best.
The Qlikview thing alone doesn't make you that desirable unless there's a severe shortage of developers with that technology. I don't know what the story is in Poland regarding that. You need to have another programming language like Java or C++ which are always in high demand. I mean one that you've been using in the last two years, not one that you did in college. As you know from your career thus far, employers are constantly asking developers to switch projects and use different languages or tools.
Finally it depends on which city the job is in. Warsaw pays the highest salaries.
I would say you could do a bit better than 7,000 gross but not that much. 8,500 maybe.
i got rejected once due to salary part
How much did you ask for and how much experience did you have then?