Computer software engineering is one of the fastest growing occupations. These IT professionals apply the principles of computer science and mathematical analysis to the design, development, testing, and evaluation of the software and systems. Computer software engineers hold more than 857,000 jobs nationwide. Employment is projected to increase by 38 percent over the next decade—much faster than average for all occupations. This career will generate about 324,000 new jobs over the next decade, one of the largest employment increases of any occupation.