[4] Rahman began his career in Oshnavieh, Iran, supported by his family and coach Ali Asghar in 2008.

He appeared on the world stage for the first time at the 2010 IPC Powerlifting World Championships in Kuala Lumpur, Malaysia, where he competed in the men's +100 kg category and bench pressed 260.0 kilograms (573.2 lb) to win the silver medal, losing to teammate Karem Rajabi Golojeh.

Rahman set a new IPC Powerlifting World Record in the +100 kg category on his fourth lift with a 285.0 kilograms (628.3 lb) bench press, but did not count toward his medal performance.

[1][5] Months later, Rahman won the gold medal at the 2010 Asian Para Games in Guangzhou, China and broke the IPF Senior World Record in the +100 kg category with a lift of 290.0 kilograms (639.3 lb) on December 18, despite being eligible for the junior category.

[6] Rahman broke his own world record again, lifting 291.0 kilograms (641.5 lb) at a competition in Sharjah, United Arab Emirates on December 4, 2011.