I'd say landing such a company already require an internal or initial contact there. In case that contact does not exist, I'll tread careful like I am working w

I'd say landing such a company already require an internal or initial contact there. In case that contact does not exist, I'll tread careful like I am working with a black box. You'd have to navigate their bureaucracy somehow and a big company will have a reputation for such things (either good or bad). The contact, depending on your friendly terms with him, can shed light on how these processes work and what to expect. It's up to you to determine if it's worth your time/effort to pursue working with them. Everyone has a different sweet spot.