A test engineer is a professional who determines how to create a process that would best test a particular product in manufacturing, quality assurance or related areas, like the RMA department, in order to assure that the product meets applicable specifications. Test engineers are also responsible for determining the best way a test can be performed in order to achieve 100% test coverage of all components using different test processes. Often test engineers also serve as a liaison between manufacturing, design engineering, sales engineering and marketing communities as well.