Nik Lokman joined the Malaysian Anti Corruption Commission (MACC) in April 2010 and has accumulated 16 years of experience in various investigative, operational and leadership roles. Nik Lokman began his career as an Investigation Officer with the Anti Money Laundering Branch (2010–2012), before serving as an Investigation Officer in the Whistleblower Branch (2011), where he was seconded from the Anti Money Laundering Branch.

From 2012 to 2014, Nik Lokman served in Investigation Branch D (Private Sector/Banking), followed by a role as an Investigation Officer in the Operation Target Centre (High Profile Project Base) from 2014 to 2016. Between 2015 and 2016, Nik Lokman was seconded to the Financial Intelligence & Enforcement Division (FIED) at Bank Negara Malaysia (BNM).

Nik Lokman returned to Investigation Branch D (Private Sector/Banking) from 2016 to 2018 before joining the Anti Money Laundering Division as an Investigation Officer and later serving as Special Officer to the AML Director from 2018 to 2021. Nik Lokman was subsequently appointed as a Prosecution Officer at MACC Johor, where he served from 2022 until June 2024. Since July 2024, Nik Lokman has been serving in the Community Education Division (Private Sector Branch) at MACC Headquarters.