A header connector includes a header housing and a contact array of header contacts coupled to the header housing. The header contact has a mating pin at a mating end. The mating pin has a first side and a second side. The mating pin has a tip at a front of the mating pin. The mating pin has a top mating interface remote from and rearward of the tip configured to engage a first flexible contact finger of a receptacle contact. The mating pin has a bottom mating interface remote from and rearward of the tip configured to engage a second flexible contact finger of the receptacle contact. The header contact has an edge mating interface at the first side proximate to the tip configured to engage the receptacle contact.