A Finite Impulse Response (FIR) filters developer designs and implements digital filters that reproduce a desired frequency response in software or hardware applications. They manipulate data sequences, applying specific weightings to achieve optimal filtering effects. They perform mathematical calculations, simulations, and testing to ensure that the filter operates correctly. They also work on optimizing the filter's performance in terms of speed and accuracy. They collaborate with other engineers and developers to integrate the FIR filters into larger systems, such as audio processing, signal processing, or telecommunications systems. Additionally, they are responsible for debugging and fixing any issues with the FIR filters.