Majumder spent early years at Uttarpara Netaji Brigade team under coach Anup Nag.
He went on to play for teams like United Sikkim and Kalighat MS.[1] Majumder joined East Bengal for the 2011–12 season and made 4 appearances.
[3] In 2015-16 I-League season, Majumder used as the number 1 goalkeeper and also played AFC Champions League Qualifier game against Tampines Rovers FC & Shandong Luneng Taishan.
[4] On 4 July 2016, Atlético de Kolkata confirmed that Debjit has signed on the dotted lines on loan from Mohun Bagan for third season of Hero ISL.
In 2020, Debjit Majumder has signed for his former club East Bengal and will play in the 2020-'21 Hero Indian Super League.