Upon completing his studies, he started his career in the same year as a Malaysian Custom enforcer in turn under the Royal Customs and Excise Department in Johor Bahru.

Thereafter, he was transferred and promoted to various roles across the Johor, Negeri Sembilan, Selangor and Kuala Lumpur states involving the secretariat, investigation, industrial, acquisitions and revenue accounting, collection divisions and others between 1984 to 2020.

Then in 2020, Dato Hamiddan retired from his last position in Royal Malaysian Customs Department (RMCD) as the Customs Director of Johor whereby he headed and led the whole customs department of the state which played key roles in implementing policies related to industries, import, export and border control established by the department and the government in addition to establishing procedure related to industries, import, export and border control which is in line with the stipulated policies of the department and the government.

Throughout his 30 years career in RMCD, he has received numerous excellence awards from Wilayah Persekutuan Kuala Lumpurs RMCD, Kuala Lumpur International Airports RMCD and Johors RMCD, amongst others.

In recognition of his service to the nation, he was conferred with several honours which includes Pingat Jasa Kebaktian, Negeri Sembilan (2003); Darjah Kebesaran Ahli Sultan Sharafuddin Idris Shah, Selangor (2013); Darjah Indera Mahkota Pahang, Pahang (2018) and Darjah Sultan Ibrahim Johor Yang Amat Disanjungi Pangkat Ketiga Setia Mulia Sultan Ibrahim Johor, Johor (2018) which carries the titleship of Dato.

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