It was really tough, with too many steps in the process: diebriefing with HR, one test for them to know my skills with a software, diebriefing with the designers, diebriefing with the engineers, diebriefing with the CTO, another test to evaluate my teamwork skills, another diebriefing with HR...and a visit to Luxembourg. A proccess that lasted 3 months and give you an idea about how serious the are.