If the start-ups were taking a chance on me, they always had their 3 months of probation. Don't take it out on my pay. That stuff affords me my milk and eggs.
I learnt ML, sensor stuff, R, python and all other stuff in my first job right out of school. Made easy six figures (+ benefits and hefty bonuses) without any recruiter haggling, and am in comfortable position now. Because I turned towards traditional engineering companies, and then went there and did what I wanted to do as I got an understanding and tech oriented manager. I changed a lot of internal workings in that company.