I've been a programmer for 20 years now, and I started the mentoring with Yonatan completly by chance, two months ago. It was eye opening - I was shocked to find out my real options for promotion, salary,  and even effective-altruistic related jobs with better terms than my comfortable current job.
He had helped me a lot in other areas as well, and gave me tools to widen up my perspective and increase my certainty of things I assumed I already know, but didn't.
Yonatan express himself in exact and direct way, with purpose and pre-thought, and he is paying full attention to me, my current state and ambitions.
This mentoring was a true life changing experience for me (for the better) and my only wish is that I had found him sooner.