"We have 100 vacancies, but we’ll be fortunate if we can fill half with hires in the UK,” says Errol Damelin, the boss of Wonga. Often talent has to be imported from America or elsewhere, but immigration rules for hires from outside the European Union are still “extremely cumbersome”, he complains
Another reason is that Wonga is morally bankrupt as it takes advantage of the desperate and the ill-informed. It's harder for them to hire as they want good engineers but need them to be unconcerned with what their skills are being used for.