Jonathan Kostoff has been the head varsity girls soccer coach at Hoban since 2024. In eight seasons as a head coach, Kostoff holds a career record of 109-36-10 including a record of 31-7-2 with the Knights. The Knights won the 2025 Division III Regional and District Championships and the 2024 Division II District Championship during his tenure. He also is a Media & Content Creator and Athletics Associate at Hoban.

Kostoff also coaches club soccer at Internationals SC, serving as the Assistant Director for High School aged ECNL Regional League teams while also serving as the head coach for the U19 and U16 ECNL-RL teams. He has been with the club since 2022.

Kostoff was previously the head girls soccer coach at Kenston High School, compiling a 54-21-4 record. His teams won the Western Reserve Conference three times and reached the district final each season, capturing the only district titles in school history in 2020 and 2021. Kostoff was named Western Reserve Conference Coach of the Year three times, and was the Greater Cleveland Division II Coach of the Year in 2021, when his Bombers set a school record by winning 17 games.

Prior to his tenure at Kenston, Kostoff was the head girls soccer coach at Beachwood High School, where he led the Bison to a 24-8-4 record and their first back-to-back winning seasons in 15 years. His 2018 team set a school record with 15 victories, and Kostoff was named Coach of the Year by the News-Herald and Chagrin Valley Conference.

He resides in Brecksville with his wife, Emily, and their two children, Charlotte and James. His family is parishioners at St. Michael in Independence.