Java or C++ including modern language features such as NodeJS, C, C++, Java, PHP, GO, Ruby MySQL, PostgreSQL, HBase, Cassandra, MongoDB.http://www.youth4work/
The different programming languages need for Yahoo are as follows:
NodeJS, C, C++, Java, PHP, GO, Ruby MySQL, PostgreSQL, HBase, Cassandra, MongoDB.
Yahoo is presently transitioning to Node.js