Codility (what an awful name)
Supports, per their website: Java, C++, C, C#, Python, PHP, Ruby, JavaScript, Pascal, Objective-C, Perl, VB.NET, Lua, SQL
Pascal? There are some folks who will state, quite forcefully, that Pascal was never meant for the real world.
No BASIC, Fortran, CoBOL, APL, Ada, PL/1, etc? There is much so-called legacy code in need of support.
Care to share some of the easy, or medium, questions?