Hello friends!

So I am currently on the job hunt. I have been having a bit of trouble deciding which jobs to apply to (by level). In my short 6 year career, I've received one promotion so across the board I am at SDE2. However, many companies don't qualify the titles with a number. They have names such as Senior SDE, or Staff SDE. So is there a standardized nomenclature for SDE job titles? Which one of these titles should I be applying for? In general, I consider myself to me a mid-level engineer with quite a bit more to learn before I can say I'm up to expert or "seasoned" level. Any advice?