Since this is hacker news and some of you might find this interesting, the stack is:

* Go on AppEngine on the backend

* Elm on the frontend

And here's a breakdown of the source code:

    ~/s/g/s/teamzones (master)> cloc --exclude-dir=node_modules,vendor,static,elm-stuff,elm.js,index.html .
         158 text files.
         156 unique files.                                          
          48 files ignored.
    
    github.com/AlDanial/cloc v 1.70  T=0.86 s (132.1 files/s, 17040.9 lines/s)
    -------------------------------------------------------------------------------
    Language                     files          blank        comment           code
    -------------------------------------------------------------------------------
    Elm                             40           1069              5           4426
    Go                              37            856            270           4162
    JSON                             8              0              0           1450
    SASS                            13            423              0           1425
    JavaScript                       4             40              7            174
    YAML                            10             28              8            156
    make                             1             21              0             58
    -------------------------------------------------------------------------------
    SUM:                           113           2437            290          11851
    -------------------------------------------------------------------------------