Good question: Do they exist? I've seen back-end developers, but the front-end seems not to be a concern. There are even (relevant!) opinions about giving up steemit as front-end and let the networking run via busy.org and other condensers to effectively split Steem and its applications. That is something I find absolutely idiotic because Steemit is the brand and nobody with his brains still intact dismantles itself without having to (well, Germany maybe but that's another issue).

Overall, I think the letting run Steemit out is the real reason why they don't put an emphasis on its further development.