Low pressure, slow pace. If he exercises well, eats well, gets good sleep, etc he can manage to meet expectations in a slow well paying corporate coding job.

With ADHD you want to put yourself in a job thats as hard as possible to get fired from, that still pays well. Some kind of startup that inspires "hyper focus" may work with ADHD in your 20s, but its a ticking time bomb, you will make mistakes. Not being detail oriented, people will come to mistrust you. With a family this is a risky career path