That's a pure fantasy in most jobs. You either sign a full contract or bye. Unless you are an unicorn that company desperately needs, there are processes, rules

That's a pure fantasy in most jobs. You either sign a full contract or bye. Unless you are an unicorn that company desperately needs, there are processes, rules, internal politics, inflexible HR and so on. In a small startup, that's more likely but most folks in Europe don't work in startups.