An ear-wearable device is described that includes a plurality of modules that mate together forming a physical outer shell of the ear-wearable device. Each module from the plurality of modules is associated with a different, corresponding feature of the ear-wearable device and each module from the plurality of modules includes a respective physical portion that comprises a different, corresponding part of the outer shell. In addition, each module from the plurality of modules shares a physical interface with at least one other module from the plurality of modules.