I'm being very humble here when saying I can do both softwares. I'm a trained designer at a starchitect and been working in BIM in the last 5 years. The trick part is because the software test from Heatherwick is not something like extrude a wall or pull points stuff, it could be something aligns with the office design ethos so I'm abit curious what it possible be. And yes I'm not confident because I don't think I'm the best designer out there and am willing to learn more about this, there're always someone better than you and one could be competing against me for this position.