Soundararaja graduated his engineering degree from the Bharath Niketan Engineering College in 2004. He worked as a systems engineer in Singapore and France before deciding to pursue a career in acting in 2008. Later he joined the Chennai-based theatre group
Koothu-P-Pattarai as an accountant and actor where he observed actors. He made his beginnings as a
background actor, particularly playing the role of the lead character's friend in a few films, including the well-known series
Penn that began in August 2008, as well as several short films as part of the television show
Nalaya Iyakunar for
Kalaignar TV. He worked on many short films with
Manikandan and
Karthik Subbaraj, who later cast him in his first feature film. Soundararaja who went to director
Lingusamy's studio to audition for his film
Vettai (2011) and was selected to play
Arya's friend in the film, which marked Soundararaja's film debut. Following
Vettai, he worked on the film
Pattarai; however, the film did not see a theatrical release. After making an appearance in
S. R. Prabhakaran's
Sundarapandian (2012) in a negative role, he was cast by director
Ponram a supporting role in his first project,
Varuthapadatha Valibar Sangam (2013). Soundararaja would later credit
Prabhakaran with having had an "important role in helping him realise his dreams". He, furthermore, guided Soundararaja to many tips. Then,
Karthik Subbaraj got Soundararaja his second negative role in
Jigarthanda (2013), in which he portrayed a
shepherd. After
Jigarthanda's release, he acted in
Poojai (2014) and
Bharathan's
Athithi (2014). Soundararaja made his debut as a hero in
Enakku Veru Engum Kilaigal Kidayathu (2016), in which he acted alongside
Goundamani. He also acted along with
Vijay in
Bigil (2019) as a police officer. He has performed in
Thudikkum Karangal (2023) as a police official investigating the case. In
Jagame Thandhiram (2021), Soundararaja appeared in a supporting role, delivering a restrained and realistic performance and also acted as lead protagonist in
Saayavanam (2025). == Activism ==