Java/SDET jobs are positions for Java developers and engineers who develop, program, and test Java applications using software development engineer test (SDET) processes. Your responsibilities as a Java/SDET position focus mostly on testing the coding and performance of applications and software that use the Java computer language. You also look at how they affect a computer or network. Your duties include using tools to test and optimize software through the development process to the final product, designing testing processes that meet the needs of each project, creating code to fix a coding issue, and analyzing and reporting test data.