Apple’s macOS Sierra broke Karabiner key mappings for programmers. Here’s how to work around.
Common case for a developer is to have backtick, caret and possibly something else easily accessible, but while Karabiner devs are still working on a fix for macOS Sierra a workaround is needed.
Good alternative that gets the job done well, is Keyboard Maestro. It’s comprehensive and GUI is similar to Apple’s Automator, so one can get away without coding.
My own Keyboard Maestro macros consist of just 2 things (
^) for Estonian keyboard layout. Feel free to fork and adjust.