Perguntas de entrevista de vagas de Algorithm Engineer da empresa IBM

First you have to apply online, If you are selected you need to pass 2 online tests. One about short mathematical problems, and one about numerical series (the numerical series were by far more difficult than in other companies, the problems, however, were pretty easy). The first interview was throw skype with the team manager and a software engineer. It was in Spanish and english because I was applying to work in Madrid. The second interview was a case about programming skills.