ABSTRACT: For any modular spacecraft design that allows for reconfiguration once in orbit, there is a need for an interface that acts as a common connection between the modules. The interface must provide autonomous docking, undocking and communication, in addition to transferring mechanical, electrical and thermal loads through each of the modules. This study focuses on the requirements and design of an interface developed as part of the SWARM spacecraft test bed at MIT. The key features include its simple, compact and universal design. It also houses the metrology subsystem and allows for autonomous docking and reconfiguration of the modular components.