Born in Sant Cugat del Vallès, Barcelona, Catalonia, Benja concluded his youth development at CF Damm before joining RCD Espanyol B in 2006, spending his tenure on loan at CE Europa.

Two years later, he joined another reserve team, FC Barcelona B, and after a loan at CF Reus Deportiu he scored eight goals in 26 games in his first season as they won promotion from Segunda División B, including a hat-trick in a 3–3 away draw against Polideportivo Ejido in the first leg of the play-off first round.

[1] On 14 July 2011, Benja transferred to Segunda División side Girona FC,[2] totalling 14 goals in 53 competitive matches over the next two campaigns, two of those coming in the first 11 minutes of a 3–1 home win over Sporting de Gijón on 29 September 2012.

[9] In his first season at the Estadio Martínez Valero, Benja scored 14 times in all competitions,[10] including the crucial goal in a 3–2 aggregate victory over Villarreal CF B in the playoff final to reach the second division on 23 June 2018.

[11] Having not added another goal, he joined neighbouring Hércules CF in February 2019 on a short-term loan to cover the long-term injury of Stephane Emaná;[12] in July, following a playoff final defeat to SD Ponferradina, he signed a two-year deal.