He joined Hapoel Tel Aviv of the Israeli Premier League in 2018. He debuted for their senior team in 2018, at age 17, becoming one of the youngest players in club history. Two years later, he became the youngest player to ever win the Israeli Premier League Most Improved Player. Madar is also a member of the Israel senior national team. He has won a gold medal for Israel at the youth level, playing at the 2019 FIBA U20 European Championship. Madar also has earned a spot in the All-Tournament Team. Madar was selected with the 47th overall pick by the Boston Celtics in the 2020 NBA draft.