As a mid-level engineer currently job hunting in NYC, the salary range for most non-FAANG companies (including most start-ups) seems to be $90-150k.
From my experience, the idea of "mid-level" and "senior-level" employees in our industry seems to be skewed to the left. Mid-level employees are generally 2-5 years into their careers, and senior-level can be anywhere beyond that. When you think of senior-level employees in other industries, you generally assume they have 10-20+ years of experience under their belt.