I don’t have enough reliable Glassdoor salary data here to give you a Boeing Level 4 Engineer pay range. The salary block for Boeing shows an employer entry, but it doesn’t include a usable average salary range.
Based on Glassdoor job listings, there are 1,860 Boeing openings right now, so there’s still a healthy market to explore. If you want, I can help narrow this down by engineering specialty or location so you get a more realistic pay target.