[benque]

For embedded and system programming roles, try applying at companies which evaluate you only on generic coding skills, and then learn on the job. Typically these companies use C, C++, or Rust for low-level software and perhaps Golang or Java for middleware. Assuming that you're familiar with one of these languages (or any other statically typed language) and concepts such as multithreading, event multiplexing API (epoll in Linux or libraries such libevent), you can start applying right away.