Ask HN: How to stay current with engineering during an extended hiatus?

Hey all. I'm about to graduate my undergrad program with a degree in computer engineering, and I know that long term I will want to pursue engineering as a career. However, right now it's looking like my world line is taking me along a path which will keep me out of engineering (both in industry and education) for at least around 10 years. Does anyone have any thoughts or recommendations as to how I could continue to keep my skills current and employable during this time?