[kaybe]

Could you give a short explanation of what this L3/L5/L7 thing is?

I'm assuming you're not talking about spinal cord problems, which is the main search result.

[pzs]

I think [1] gives an explanation of it.

[1] https://levelsfyi.com/google-levels-salary/amp/

EDIT: found a better source

[Zaheer]

Hey I'm from www.Levels.fyi - this is exactly what our site was built for. The link above is a copycat site and you can see the latest leveling info / compare with other companies on ours.