Software developers develop computer applications that allow users to perform specific tasks on computers or other devices. They may also develop or customize existing systems that run devices or control networks. Most of the time, software developers work in an office. 

They must be familiar with various computer languages, such as C++, Python, Java, PHP, XML, HTML/JavaScript/CSS, and Unix Shell Scripting. They must also be familiar with various operating systems, such as Linux, Solaris, HPUX, BSD, Mac OS X, and Windows. They must know various databases, such as Oracle (PL/SQL), MySQL that are used widely in various businesses.