I negotiated with my current employer, sacrifice salary for time. I get a few extra hours each week. My full-time job doesn't demand a lot. I manage it quite well and get things done during business hours.
I manage my time quite well, I get eight hours of sleep everyday and the rest I try to be productive. I have a wife who understands what I'm trying to do and helps me out. Needless to say I work on weekends and holidays and gave up all hobbies.
It's not easy but it's a choice. This has helped me build habits and a discipline. I am mindful and try not to bite off more than I can chew i.e. understand my limits.
My side project has also changed the way I think about engineering problems and solutions. Since I work on the growth team its complementary rather than diverging.
