As a contract Salesforce developer, your duties involve creating customer relationship management (CRM) software solutions for a company on a temporary or freelance basis. Your responsibilities vary depending on the type of project you work on and the needs of each client. You are often involved in application design and testing. You write code for the applications and solutions that you build using the Apex language. Since you work on an independent basis with different clients, your job involves assessing the needs of each client so that you can build the solutions and applications that they need.