In July 2017, Rubinshteyn returned to Tsmoki-Minsk for the 2017–18 season. On December 16, 2017, Rubinshteyn recorded a career-high 29 points, shooting 19-for-20 from the free throw line, along with six rebounds and four assists in a 94–99 loss to Borisfen Mogilev.[3] In 46 games played during the 2017–18 season, he averaged 11.3 points, 3.5 rebounds and 3 assists and 1.6 steals per game. Rubinshteyn won the 2018 Belarusian League and the 2018 Belarusian Cup titles with Tsmoki-Minsk.
Rubinshteyn is a member of the Belarus national basketball team. He was also a member of the Under-16, Under-18 and Under-20 Belarus national teams.
In July 2015, Rubinshteyn participated in the 2015 FIBA Europe Under-20 Championship Division B, where he averaged 12.4 points, 4.1 rebounds and 4.4 assists, leading the U-20 Belarusian team to the fifth place.[9]