The SWE ladder goes from L3 - L9. L5 is a place most average software engineers will stay. Getting above L6 as an individual contributor makes you a very special person.
Swe 2, Swe 3, senior, staff, senior staff, principal, distinguished, god
In that order, except god isn’t really a level it’s just Sanjay and Jeff.
Swe 2 is L3, goes up by one for each level, thus senior is 5, senior staff is 7, etc