Do tech jobs discriminate against mental illness? By saying they couldn't possibly be competent? I think some jobs discriminate by default, by looking at someon

Do tech jobs discriminate against mental illness? By saying they couldn't possibly be competent? I think some jobs discriminate by default, by looking at someone's CV, which could be tainted by periods in hospital. Myself, I have a mental illness and haven't been able to find work. It's up to me to sell my own software to make a decent living.