De Alwis father wanted him join the
railway department but de Alwis was attracted to radio broadcasting. He started working for Radio Ceylon as a freelance announcer on 17 December 1967. He became a permanent announcer in June 1971 and was promoted to
programme producer. He became a Grade Two announcer in 1974 and afterwards presented programmes such as
Sonduru Sevana,
Serisara Puvath Sangarawa and
Shanida Sadaya on Radio Ceylon's successor
Sri Lanka Broadcasting Corporation (SLBC). He later joined the
Sri Lanka Rupavahini Corporation, presenting programmes such as
Anduna,
Shanidha Ayubowan and
Sampath Rekha (National Lotteries Board). De Alwis was a prolific lyricist, writing hundreds of songs. He wrote his first song,
Hada Puda Asune Senehasa Bendune, in 1969 for Rupa Indumathi and Malkanthi Nandasiri. In the same year he wrote his first film song, for
Lokuma Hinawa directed by K. A. W. Perera. He wrote songs for more than 150 films. He wrote songs for numerous singers including
Mohideen Baig, Malini Bulathsinhala,
Milton Mallawarachchi,
J. A. Milton Perera, Mervyn Perera,
Victor Ratnayake,
Freddie Silva and
Priya Suriyasena. Popular songs written by de Alwis include
Aaron Mama,
Adaraneeya Neranjana,
Adare Ran Bingun Nesu,
Beri Bara Hindai Daruwan Dunne,
Eda Re Guwan Thotupoledi, E
ka Gini Koorai Mulu Gedarama Thibune,
Kurullanta Gee Gayanna,
Ma Ekkala Amanapawa Wee Dabara,
Mannaram Piti Welle,
Me Nagaraya,
Mudu Parama Supiwithuru,
Oba Dedunna Akasaye,
Raththaran Menik Muthu Mokatada Ewa and
Sanda Midulata Enawa. ==Assassination==