At this moment I work with the booking system on the client, administrative, business owners' parts. I'm the only one frontender on the project. The system works in English, Russian, Japanese and Korean. My job is to create new interfaces, support current interfaces, add new functionality, work with designer and backend developer, fix bugs if there are any, sometimes translations from Russian to English and vice versa, and support our static site, which is also made by me.
Little familiar (no commercial experience):
Prefer working with less amount of libraries. It's better to make own solutions.
Don't make emails, but I know the guy who does it perfectly.