A method for manufacturing electrical connector assemblies is disclosed. The electrical connector assemblies include an electrical interposer and a first electrical receptacle. The method includes positioning a fixture coupled to or including an array of the first electrical receptacles such that each of the first electrical receptacles aligns with one of the electrical interposers on an assembly with an array of the electrical interposers. The method further includes reflowing solder to mechanically and electrically couple the array of the first electrical receptacles to the array of the electrical interposers.