A connector system comprising: a first contact module terminated to a first circuit board proximate to an edge of the first circuit board, the first contact module having a first housing holding first contacts, the first contacts being electrically connected to the first circuit board; a second contact module terminated to a second circuit board proximate to an edge of the second circuit board, the second contact module having a second housing holding second contacts, the second contacts being electrically connected to the second circuit board; and a jumper electrically connecting the first contacts and the second contacts, the jumper movable independently of the first and second housings between a mated state and an unmated state, the first and second contacts being electrically connected in the mated state; wherein the first and second contact modules (120, 122) include latching features, the jumper including latching features that engage the latching features of the first and second contact modules (120, 122); wherein, when the jumper is in the unmated state, the first circuit board and the second circuit board can be brought together from a plurality of different directions, the jumper being moved to the mated state after the first and second circuit boards (112, 114) are brought together; characterised in that the jumper is a jumper module and includes a single body having an opening along a bottom thereof and deflectable latches constituting the latching features thereof along sides of the body, the latches being configured to be securely attached to caps of the contact modules (120, 122). a first contact module terminated to a first circuit board proximate to an edge of the first circuit board, the first contact module having a first housing holding first contacts, the first contacts being electrically connected to the first circuit board; a second contact module terminated to a second circuit board proximate to an edge of the second circuit board, the second contact module having a second housing holding second contacts, the second contacts being electrically connected to the second circuit board; and a jumper electrically connecting the first contacts and the second contacts, the jumper movable independently of the first and second housings between a mated state and an unmated state, the first and second contacts being electrically connected in the mated state; wherein the first and second contact modules (120, 122) include latching features, the jumper including latching features that engage the latching features of the first and second contact modules (120, 122); wherein, when the jumper is in the unmated state, the first circuit board and the second circuit board can be brought together from a plurality of different directions, the jumper being moved to the mated state after the first and second circuit boards (112, 114) are brought together; characterised in that the jumper is a jumper module and includes a single body having an opening along a bottom thereof and deflectable latches constituting the latching features thereof along sides of the body, the latches being configured to be securely attached to caps of the contact modules (120, 122).