A CGI (Common Gateway Interface) programming developer designs and implements scripts to allow web applications to interact with servers. They create scripts that process user inputs, generate dynamic web content, and manage databases. Their work enables seamless interaction between the user-end interface and server backend. They also ensure the security and efficiency of these interactions. CGI programming developers work with various programming languages like Python, Perl, or C++. They troubleshoot issues, optimize performance, and often collaborate with website designers and other developers to create functional, user-friendly, and secure web applications.