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Brigadier General Dato Seri Pahlawan Haji Muhammad Haszaimi bin Bol Hassan joined the Royal Brunei Armed Forces in June 1993 and undergone officer training at the Officer Cadet School, New Zealand in 1994. Upon completion, he was promoted to Second Lieutenant where he served as an Infantry Platoon Commander at the 3rd Battalion Royal Brunei Land Force. He was promoted to Brigadier General on 24th July 2020 and took command as the Commander of Royal Brunei Land Force on 30th July 2020. Prior to his appointment, he was Commandant of Defence Academy Royal Brunei Armed Forces from 2019 until 2020.

Throughout his career, he has held several command, staff and instructional appointments. His command and instructional positions vary from junior level as an Infantry Platoon Commander, Mortar Platoon Commander, Adjutant, Infantry Company Commander, Second-in-Command and Officer Commanding at the School of Infantry, Battalion Second-in-Command and Commanding Officer Infantry Battalion.

He was promoted to Lieutenant Colonel in 2010 and commanded 2nd Battalion Royal Brunei Land Force from 2009 and to 2011. He also served as an instructor at the Training Institute Royal Brunei Armed Forces, where he conducted various career and specialist courses for the RBAF personnel ranging from Junior Non-Commissioned Officers to Junior Commissioned Officers' courses up to the rank of Captain.

He held several key staff appointments including as the Military Assistant to the Deputy Minister of Defence in 2008 and also as the Military Assistant to the Commander of the Royal Brunei Armed Forces in 2012. In the fields of training and education, Brigadier General Dato Seri Pahlawan Haji Muhammad Haszaimi has attended the Intermediate Staff Course (ISC) at the Australian Land Warfare Centre in 1999, the Australian Command and Staff Course (ACSC) at the Australian Defence College in 2007 and the Royal College of Defence Studies (RCDS) in the United Kingdom from 2012 to 2013. Upon his return to Brunei Darussalam, he was appointed as the Chief of Staff of the Royal Brunei Land Force in September 2013 and was later promoted to the rank of Colonel in May 2014. He was then appointed as Deputy Commander Royal Brunei Land Force from 2014 to 2017 and as Commandant of Training Institute Royal Brunei Armed Forces in 2018.

His other overseas career courses include Platoon Commander's Course and Mortar Officer's Course in 1997 at the School of Infantry in New Zealand, Company Tactic and Advanced Infantry Officer's Course in 2004 at the Singapore Armed Forces Training Institute (SAFTI) in the Republic of Singapore, Grade 2 Staff and Tactics Course in 2006 at the Army Training Centre (PULADA) in Malaysia, Malaysian Joint Warfare Course in 2010 and successfully attended 8th Executive Development Programme MINDEF, Stanford-NUS Executive Development in International Management in the Republic of Singapore in August 2015 and Senior Executives in National and International Security 2016 at the HARVARD Kennedy School, USA.

In 2005, Brigadier General Dato Seri Pahlawan Haji Muhammad Haszaimi was awarded The Excellent Service Medal (PIKB – Pingat Indah Kerja Baik), The Most Honourable Order of Seri Paduka Mahkota Brunei (SMB – Darjah Seri Paduka Mahkota Brunei Yang Amat Mulia Darjah Ketiga) in 2012, and on 15th July 2021, he was also conferred The Most Gallant Order of Pahlawan Negara Brunei, First Class (Darjah Pahlawan Negara Brunei Yang Amat Perkasa Darjah Pertama) (P.S.P.N.B) which carries the title Dato Seri Pahlawan from His Majesty Sultan Haji Hassanal Bolkiah Mu'izzaddin Waddaulah, Sultan and Yang Di-Pertuan of Brunei Darussalam. In his free time, he enjoys reading and play golf.

Brigadier General Dato Seri Pahlawan Haji Muhammad Haszaimi is married to Datin Ummisyafinah binti Haji Zaini and blessed with four children.