Paulo Junichi Tanaka began his youth career with Osaka Toin Junior & Senior High School in 2009, and left in 2011 when he graduated.
On 23 December 2018, Tanaka officially joined to fellow J2 club, Renofa Yamaguchi for the upcoming 2019 season.
On 23 December 2020, Tanaka officially transfer to fellow J2 club, Matsumoto Yamaga for the upcoming 2021 season.
[7] On 3 February 2023, Tanaka announce official transfer to Kantō Soccer League club, Tochigi City FC ahead of 2023 season.
[8] On 26 November 2023, Tanaka brought his club promotion to JFL from 2024 after defeat Joyful Honda Tsukuba 4–0 in final matchweek of JRCL in 2023 and Champions.