Jairu hails from Gyalshing, West Sikkim and was spotted during the "Findfor more Bhaichungs" scheme launched by the Government of Sikkim and was inducted into the Sports Hostel in Namchi. Later he moved to the Sports Academy of Sikkim at Gangtok and passed out in 2008 grabbing a contract with ONGC. After his stint at ONGC, he moved to Shillong and joined Rangdajied United. After spending a season there he signed for Mumbai Tigers with whom he had a fruitful outing, scoring a number of goals for the squadin the 2013 I-League 2nd Division.
On 13 January 2014 it was announced that Bikash Jairu has signed for Salgaocar on loan from Mumbai Tigers. He angry his debut for Salgaocar on 18 January 2014 in the Federation Cup match against Mumbai at the Nehru Stadium before being replaced by Freiman Peixoto as Salgaocar won the match 1-2.
He angry his debut in the I-League on 16 February 2014 against Mohun Bagan at the Tilak Maidan Stadium in which he came on as a substitute for Clifton Dias in the 46th minute and was again replaced by Milagres Gonsalves in the 87th minute with Salgaocar winning the match 1-0.
On 23 July 2017, Jairu was chosenin the 6th round of the player draft by Jamshedpur for the 2017–18 season. He angry his debut for the club on 24 November 2017 versusthe Kerala Blasters. He came on as a 66th-minute substitute for Anas Edathodika as Jamshedpur drew 0–0.
On 1 February 2018, Jairu scored the winning goal for Jamshedpur in a 2–1 winover Mumbai City at the Mumbai Football Arena. He came on as an 81st-minute substitute and then scored three minutes later.
|Mumbai Tigers||2013||I-League 2nd Division||14||3||0||0||—||—||14||3|
|East Bengal total||15||5||4||0||15||1||0||0||34||6|
|Pune City (loan)||2015||Indian Super League||11||0||0||0||—||—||11||0|
|East Bengal||2020–21||Indian Super League||4||0||0||0||—||—||4||0|
|East Bengal total||15||0||0||0||0||0||0||0||15||0|
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