Devnaka became a popular actor particularly with the blockbuster film Gharasarapa and television serials Ganga Addara and Sihina Wasanthayak.
[7] While he was a student at Elic International School in Mabima, he won the gold medal in the Yellow Belt Kata event at the Colombo Shotokan Karate Tournament 2009.
[8] During his secondary school period, he excelled in Itosukai Sports Karate where he started the style in 2010 and won his first gold medal.
[6] As a child artist at the age of 7, Devnaka appeared in the television commercial of Vanitha Wasana in 2007 along with Umayangana Wickramasinghe and Upeksha Swarnamali.
[5] Then he continued to appear in several commercials including, Alpenliebe (2008), Britannia Biscuits TVC (2009) with Lasith Malinga, Munchee Super Cream Cracker (2014) and Lipton Laoji (2014) and Sampath X-set (2016).
In 2008, he made his maiden drama appearance with the television serial Sihina Wasanthayak directed by Sunil Costa.
[7] In 2008, Devnaka made his maiden cinema appearance in the sci-fi film Pitasakwala Kumarayai Pancho Hathai directed by Sirimal Wijesinghe.
[6] In the film he played a lead role 'Podda' along with several veteran artists such as Suminda Sirisena, Sanath Gunathilake, Dilhani Ekanayake and Janaka Kumbukage.