CiuB

I often read comments from other HN members, saying how they kept there skills up to date keeping them employable in a changing work place. As a Linux device driver developer, what new skills/technology can I learn to future-proof myself in terms of work?

I often see my colleagues put something along the lines of "Senior Engineer" in their job title in LinkedIn etc. Some are working the same length of time as myself, 3 years as a software engineer, and in the same position as myself. I feel like this is misleading, what are people's opinions on this? And when do people think it is appropriate to call yourself a senior software engineer?