Jack Pierse is standing just outside his office on Baggot Street in Dublin 2. Pierse will turn 30 later this month but it has already been a momentous start to the year. Just two weeks ago, along with his co-founder Aidan Corbett, Pierse finalised a $150 million funding round that valued their business, Wayflyer, at $1.6 billion. If the valuation was impressive, the length of time it took Wayflyer to achieve it was extraordinary. After all, it was only founded in September 2019 and launched just 20 months ago. It has become Ireland’s fastest-ever unicorn. Not that this is obvious…