My worst devExperience since there are dev evperiences for me, was when I had to rewrite a pretty important tool to the new onlineshop we created.
See https://devrant.com/rants/1016596/...

My best devExperience in 2017 was going live with one of our biggest web projects I had to develop all alone and hearing only great feedback. My boss told me there were more than 30'000 visitors one day after going live.
It was and still is quite satisfying. 😎