How to talk about salary after interview in IT industry? The recruitment information says 5- 10k. Is it reasonable for me to ask for 9k?

I think it depends on the actual situation. If your professional ability is excellent and the company is short of people, that's no problem. If you are as outstanding as your professional ability, I feel that you are getting higher, but if you can express your opinions and solve the core problems of the company, and you not only know the technology but also have development ideas, this is no problem. One more thing is very important. Who are you talking to? Talking to hr is different from talking to the boss.