I'm job searching right now, with a bunch of previous experience, but not all in the same position. So it's not as though I've had one job description Y for many years - in which case I would now feel natural applying for a "senior Y" position.
Seeing some positions (especially within a single company) described as "X" and other positions as "Senior X" - what criteria can I use to understand whether I better fit the former or the latter?
Note: In my case, X can be "research scientist", "software engineer", "systems architect", "researcher" and a few more; but if you can answer more generally, please do.