C++
General purpose, well compiled and around since 1979, C++ is an object oriented, very technical language. Extremely powerful and with extensive libraries, this is one of the cornerstone languages of back end development. Especially useful for high performance programs and template-heavy programs, this stalwart isn’t going anywhere just yet. If you already know C (or if you’ve learned C++ and want to turn your hand to C), you’re already part of the way there.