HER305 is a course offered in the John A. Paulson School of Engineering and Applied Sciences at Harvard University. It is a part of the Engineering, Applied Sciences and Technology (EAST) concentration. The course focuses on high-performance embedded systems, which typically involve real-time control, embedded software and hardware, and networks. It explores the architecture, programming, and design of embedded systems. Topics of the course include system-level design, digital circuits and their integration, programmable logic, mathematical models, device interfaces, cross-platform programming and debugging, system optimization, and real-time control. Students who take the course learn how to build and use embedded systems, develop programs for them, and debug and optimize them.