Haji Noorzainy Bin Haji Mohd Noor started his police career with the rank of Inspector on 27 December 1982 and served as a Criminal Investigating Officer at IPD Klang, Selangor after his training..

In 1992, he was transferred to serve as Lecturer and Sports Training Officer at Kuala Lumpur Police Training Centre (“PULAPOL”) with the rank of Chief Inspector of Police.

In 1995, he was transferred to IPD Klang, Selangor as a Traffic Investigating Officer for 3 years. For his excellent performance and commitment, he was promoted to the rank of Assistant Superintendent of Police on 1 January 1998 and served as Traffic Enforcement ASP at Traffic Branch, Selangor Contingent Police Headquarters. With his extensive experience, on 15 March 2004, he was transferred to IPD Shah Alam and served as Head of Public Security Division for 17 months.

Haji Noorzainy was then transferred to IPD Ipoh as Head of District Administration Division. In 2008, he was transferred as Officer in Charge of Troop 4A, Unit 4, Federal Riot Unit, Department of Internal Security and Public Order, Kuala Lumpur and subsequently to IPD Besut, Terengganu as Deputy Officer in Charge of Police District. He also served as Deputy Head of Crime Prevention and Community Security Department (Operations), Terengganu Contingent Police Headquarters and Officer in Charge of Jempol Police District, Negeri Sembilan with the rank of Superintendent of Police and subsequently promoted to the rank of Assistant Commissioner of Police as Officer in Charge of Seberang Perai Utara Police District, Pulau Penang.

On 20 April 2023, he had officially retired from the Royal Malaysian Police Force as a Senior Assistant Commissioner and Head of Crime Prevention and Community Security Department in Perak Contingent Police Headquarters, a position he has held since August 2021.

Haji Noorzainy holds a Diploma In Law from Universiti Teknologi Mara (“UiTM”), Shah Alam in 1986.

He does not hold any directorships in other public companies or listed companies.