After graduating, he worked as a civil engineer, taking part in the construction of Lumut Naval Base and several bridges in Malaysia.

Ng began to train for Christian ministry, and, in 1985, he graduated Bachelor of Divinity from Seminari Teologi Malaysia (STM).

In 1996, he was collated as a canon of St. Mary's Cathedral, Kuala Lumpur, and in 2001, he was appointed Archdeacon of the Lower North Archdeaconry.

His principal consecrator was the then Archbishop of South East Asia Dr. John Chew, the Bishop of Singapore.

In 2011, Ng was made Knight Commander of the Distinguished Order of Service for the State (Panglima Jasa Negara, PJN) by the Yang di-Pertuan Agong, granting him the right to the Malaysian title 'Datuk'.