A temporary software developer works on a freelance or contract basis. Your duties focus on the development, design, and testing of software programs. You may have a different set of responsibilities depending on the details of each project, such as working with computer code to develop programs or create a mobile application. A temporary software developer can work on one facet of a project, such as testing or coding a specific process. Developers sometimes specialize in working with one computer language, although knowledge of multiple coding languages is beneficial in this career.