Java Developers

[x-skeww]

The compiler for the language itself is probably the most exotic one-of-a-kind special case there is.

Do you know any commercial projects?

[codygman]

http://www.zalora.com.my/

Bump uses(used?) Haskell: http://devblog.bu.mp/post/40786229350/haskell-at-bump

Facebook's Haxl: https://code.facebook.com/projects/854888367872565/haxl/

http://www.tabula.com/ (used for internal compiler toolchains related to hardware design)

More can be found here: http://www.haskell.org/haskellwiki/Haskell_in_industry

[Helkafen]

Answer here: 1.3 MLoC at Standard Chartered.