The average Harmony Public Schools salary ranges from approximately $34,764 per year for Assistant Teacher to $87,560 per year for Director of Student Services. Human Resources. Common questions about salaries at Harmony Public Schools. The Johnston County Public Schools Employee Handbook is designed to provide information and address questions regarding required Board of Education policies and procedures so that every BHS also has resources online available to our Johnston County Public School Employees. Harmony Public Schools is a Texas-born, Texas-wide system of free public charter schools, offering high-quality, STEM-focused learning for students for their dedicated focus on character development that contributes a positive effect on academic achievement, student behavior, and school climate.