I have been working as the only front-end developer at my current employer for over five years (in what is now a mostly dead technology - Backbone.js). Before that I was a full stack developer using technologies that are no longer in high demand (LAMP + jQuery).
I'm currently unlearning some bad habits (the kind that come from not having code reviews) and learning new libraries/frameworks (React/MERN).
I guess, what I really want to know is, at what point is one considered a senior (front-end) developer? It seems like I should be by now, but I don't feel like I am. Thoughts?