Software Engineer: "responsible for designing and programming large-scale computer systems and applications. Similar to a systems analyst, software engineers primarily design and build complex system software, such as operating systems, protocol architectures, or databases upon which application software programs will run. Software engineers often make use of complex methodologies like Object-Oriented Modeling and Design and rapid application development (RAD) tools like Rational Rose to build these large-scale systems; as a result, software engineering normally requires formal training in computer science."