A decade ago, Stephen Costello landed a digital marketing job with The Physio Company, a chain of consumer physios dotted across Ireland. He was quite lucky to get the job in some respects. His new boss and the company’s founder, Stuart McGoldrick, had only planned to hire one senior person, not a graduate in search of their first job out of college. But the pair bonded over their shared love of aviation in the interview and McGoldrick, the son of a former Ryanair executive, made room in the budget to take on the then 23-year-old UCD alumnus, too. “He just…