Staff actually may be a different level depending on company you’re looking at. There may not be one standard definition (though there may be generally agreed upon responsibility). See IBM for example, Staff is the second level: https://www.levels.fyi/?compare=IBM,Google,Facebook&track=So...

Also this post may be helpful: https://www.levels.fyi/blog/what-are-career-levels-ladders.h...

For some rough scope and responsibility at each standard level, click on the cells here to get an idea: https://levels.fyi/standard/