For Oslo the salary range is something like this, a bit lower in smaller cities. These are the "typical" brackets, but you can definitively get a lot more:
- 0 YOE - €45k-€60k
- 3 YOE - €55k-€90k
- 5 YOE - €70k-€150k and up
A "median" salary in Oslo for a developer with 3-8 YOE is around €70k-80k. Anyone who has 5 YOE and actually asks for a higher salary can easily get 1 million NOK or €90k++.
Expect a 32%-38% tax rate on your income.
If you earn 1 million NOK (€85k) you will pay €27k in tax.
Here is the tax calculator from the official tax office: https://skattekalkulator.app.skatteetaten.no/
EDIT: Here is an article in Norwegian about software developer salaries. It shows about the same numbers as mine, just a lower ceiling.
https://witted.com/blog/software-freelancing/lonnsniva-for-u...
That leaves €58k. After paying all taxes I make €53k in Romania. So moving to Norway means I would lose a lot since the prices are much higher there.
The best paying jobs are usually provision-based consultant/contractor positions. Some companies go hard in that direction, others lean more towards job security and stuff like that. You get paid less, but you get paid the same amount regardless of whether you have work to do. They spend more money on social things like company trips and other events etc. Then there's various benefits like pension, insurance, they might pay for internet and gym memberships, lots of stuff like that.
You pretty much just have to see what they offer.
As to earnings by industry, you can check them on the statistics bureau website: https://www.ssb.no/arbeid-og-lonn/lonn-og-arbeidskraftkostna...