Any OSS project leads here, that need a front-end developer? ;)
Also:
"Can I apply with a project that already exists?
Yes you can. However, your proposal ought to be clearly defined and and have its own degree of novelty, e.g. you plan to expand or enhance your preexisting project with a new module. In any case, you need to make clear what you will be working on during the 6-month project term."
Some ideas for useful addons to existing projects, keeping in mind I am not sure what your focus as a front-end developer is:
Gnu Privacy Assistant https://www.gnupg.org/related_software/gpa/index.html is a GnuPG frontend written in GTK. The software works well and does nice things like file encryption, taking a piece of text and outputting it encrypted.
The GUI badly needs improvement. I'd be happy to point out several problems.
I also don't believe GPA is available in platforms like Windows and macOS.
Kleopatra is a GnuPG and S/MIME frontend written in Qt (KDE libraries). It is maintained and available on Windows (through GPG4Win) but is still "computer power user"-centric and could also use user interaction love.
On a side note: One method that Enigmail uses to import PGP certificate is the ability to get a valid PGP certificate from a URL. Adding that functionality to GPA and Kleopatra would be nice wins.
All three frontends, Enigmail, Kleopatra, or GnuPG would do well to have a graphical or screen-based export of public keys. Something like a QR-code export of a minimal PGP public key would be nice for importing via smartphones.
