You'd need to know a lot more about data structures, memory management, hardware in general, and probably be at least passingly familiar with the concepts of verified software and the mathematics underpinning computer science to work on embedded systems.
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I specifically say in my post "lets say a web developer".
That is where my area is, I've no idea what I'd want for an embedded developer but I suspect the list is no less complex.
You'd need to know a lot more about data structures, memory management, hardware in general, and probably be at least passingly familiar with the concepts of verified software and the mathematics underpinning computer science to work on embedded systems.