Yes it totally is. You have to become good at doing great work and staying focused in the time window you have and prioritize the hobby. For example do 10 hours

Yes it totally is. You have to become good at doing great work and staying focused in the time window you have and prioritize the hobby. For example do 10 hours of work in 8, then cut out and do your hobby. Mine this summer is running and climbing. Its counter intuitive but doing well in the hobby will feed your 9 to 5. In your case you're talking about a specific technical hobby which is also cool. Just code all of it on your personal comp not during work hours. Once it get big hire a lawyer and get a llc. Don't limit yourself, identify problems and find solutions. Be an engineer. You got this.