An electrical connector assembly includes a first electrically conductive contact member and a second electrically conductive contact member. Both contact members have non-planar interface surfaces. The second interface surface is complimentary to the first interface surface. The first interface surface may include a plurality of elongated first ridges and a plurality of elongated first valleys, and the second interface surface may include a plurality of elongated second ridges and a plurality of elongated second valleys. A first ridge is received by a second valley and a second ridge is received by a first valley.