As a power electronics engineer, you design and test circuits to use in power electronics systems. In this role, you may develop prototypes, find solutions for known flaws in mechanical designs, and collaborate with other engineers to perform cross-functional tasks when testing designs. You often analyze analog circuitry, work with high-frequency magnetics, and help estimate power losses and overall efficiency as electricity works its way through circuits. Your responsibilities also include maintaining accurate documentation of all circuit designs. Some details of this job depend on the company you work for and the type of electronics they need.