Every machine instruction in a Computer System is solved through a sort of micro-operations that use very different low level hardware resources depending on the processor range and instruction type. These low-level resources are normally known as Computer Computer or Computer Microarchitecture, and its knowledge allows us to face real Hardware projects in every development stage: Description, modeling, simulation, and finally, Integrated Circuit Design (SoCs, ASICs, etc.). Very active, broad, and innovative Research areas related with Computer Systems Organización can be found, some of whose results, several years after their publication, lead to innovative new Processors, memory technologies, or hardware controllers that build a Computer System. Is it possible to get a job in the Custom Computer Systems design industry? Of course!. The rise of architectures such as RISC-V offer a Big opportunity for this. Its specifications are focused exclusively on Architectural resources, leaving the Organization decision to the hardware designer, who can adapt this architecture to a modest closed-loop control system or to multiple processing cores with Cache memories, memory virtualization capacity, out of order execution, and so on. In this way, the performance can be increased by providing custom solutions in the SoC architecture. A Big enough international market is waiting for innovations. A foundry is not required for this purpose. You only need adequate development tools, and some powerful computers. But without knowing the basics and fundamentals, that rules the building blocks that work under Architectural registers and instructions, there is not much that you can do in this field.