Comment by bruce511

I spent several years working on an embedded hardware project.

The key skill is C. Most everything else can be learned on the job, and will differ from project to project.

Obviously not all embedded programing is in C (although a lot is) but folks proficient in C are typically quick to pick up other languages.

So from a resume-bolstering point of view I'd suggest getting a Raspberry PI (or similar) and build some C projects on it. That would expose you to a lot of embedded skills. Bonus points if you choose a device either severe memory and/or cpu constraints.