A Cadence NCSim developer works on Cadence Design Systems, particularly focusing on the NCSim simulation tool used for verifying the functionality and timing of digital and mixed-signal circuits. Their responsibilities include writing test benches in SystemVerilog, debugging RTL designs, and ensuring the designs meet the specifications. They also perform code coverage analysis, gate-level simulations, and timing simulations. They work closely with design engineers to identify and fix issues. Their objective is to ensure the integrity and reliability of the systems being designed. Additionally, they may also be involved in improving the simulation tool's efficiency and performance.