In my interviewing experience (looking at the time for something not dissimilar), lots of people think that 'knows C' and 'embedded systems' are the same as "I took a single module involving C at university, and by the end of it, my things were only randomly segfaulting maybe 70% of the time."

Or they've never touched either C or an embedded system in their life, but somehow it ends up on their CV and they tell you about how passionate for learning they are. Which may well be true, but it raises questions about your honesty and/or capacity for introspection. Also, bare-metal embedded really isn't the place to learn C[1], given that most failure modes are "It doesn't work. And maybe something caught just fire."

[1] Ask me how I know...