As a freelance computer programmer, your job is to develop computer code for your customer. This may include creating new software, modifying an existing application, or setting up a database for the software to use. Freelance programmers work on projects of all sizes, from small tasks that only take an hour or two to complete to major jobs at large companies. Depending on the company's needs, you may need to use a wide selection of programming languages or techniques, interface your software with existing code, and manage multiple deadlines at once. Many freelance computer programmers focus on building a portfolio of completed projects, which is particularly helpful if you want a permanent position later in your career.