A Measurements While Drilling (MWD) developer designs and implements systems that gather and analyze real-time data during drilling operations. They work on technologies that measure and record physical conditions like temperature, pressure, and vibration, while drilling is in progress. These systems help to determine the geological characteristics, the correct placement of the wellbore, and detect potential issues. The MWD developer must ensure the accuracy and reliability of the system, often working in collaboration with geologists, drilling engineers, and other oilfield service specialists. They also assist in troubleshooting and maintenance, and continuously improve the system based on feedback from field operations.