An FPGA (Field-Programmable Gate Array) and System Design Developer designs, develops, and optimizes systems using programmable logic devices. They create digital circuits on FPGA platforms, write and debug system level code, and often work with hardware description languages like VHDL or Verilog. They also design system architectures, develop test benches for system verification, and troubleshoot any issues that arise. Additionally, they optimize the design for performance, power, and cost. Apart from these, they collaborate with other team members to ensure the system meets the required specifications and standards. They are typically involved in the entire lifecycle of a product, from concept to deployment.