Dato' Sri Hadian began his career with Sarawak Shell Bhd (SSB) in 1982 and throughout his 12-year career with SSB until 1994, he was involved in the Oil & Gas (O&G) Exploration and Production (EP) activities and developed his expertise in various aspects of the business as well as working with PETROLIAM NASIONAL BERHAD. Dato' Sri Hadian left SSB in 1994 to venture into business and develop his entrepreneurial skills.

In 1995, he joined Itochu Pipe and Tube Asia Corporation Sdn Bhd (IPTASCORP) as a director. IPTASCORP is involved in selling tubular goods and steel products to O&G companies.  

In 1999, Dato' Sri Hadian became a shareholder and director of Integrated Petroleum Services Sdn Bhd. (IPS). IPS provided support services to the offshore O&G industry in Malaysia, Southeast Asia and Central Asia. In 2006, he became the Chief Executive Officer of IPS until 2013. 

In 2012, he was one of the founding shareholders of Sona Petroleum Sdn Bhd which was listed in July 2013 as a Special Purpose Acquisition Company (SPAC) (Sona Petroleum) on the Main Market of Bursa Malaysia Securities Berhad, focused on the O&G EP business. He assumed the roles of Executive Director and Managing Director of Sona Petroleum. On 28th June 2018, Sona Petroleum was delisted. 

Currently he is a shareholder of Hendroff Holdings Sdn Bhd which is involved in O&G services.

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