[s_dev]

>How do you filter out pilots that cannot fly?

Piloting specifically requires a qualification like being a doctor etc. These qualifications are recognized and remove the need for assessment of a skill during an interview.

However there is no standard international qualification for software development like these other professions that are restricted -- you simply can't call yourself a doctor as these professions are regulated. Anyone can call themselves a software developer. Do we really want to regulate the software dev profession?