Software engineering (SE) is the application of a systematic, disciplined, quantifiable approach to the development, operation, and maintenance of software, and the study of these approaches; that is, the application of engineering to software. It is the application of engineering to software because it integrates significant mathematics, computer science and practices whose origins are in engineering. It is also defined as a systematic approach to the analysis, design, assessment, implementation, testing, maintenance and re-engineering of software, that is, the application of engineering to software.
They construct and maintain computer programs for companies. For example, they might develop programs that do recordkeeping and payroll. They might also set up an “intranet”—an internal and secure computer network—for a company. Many software engineers work for companies that make or install new and more advanced computer systems.
If you choose an educational/career pathway as a software engineer you will find employment in computer systems design and related services, software publishing, insurance, government, education, software development industries.