Killing Gunther (2017) on Netflix

Plot summary

Gunther is the hitman with the biggest reputation in the world, and Blake, an assassin, intends to kill him. A camera crew follows him so the killing can be recorded as proof. For the job he brings in Donnie, a friend who knows explosives; Sanaa, whose father Rahmat was a legendary hitman; Gabe, who claims to handle technology but has no experience; and Ashley, an elderly mentor of Blake's. More killers join: Izzat, a onetime extremist whose arm is robotic and very strong; Yong, who works with poisons alone; the twins Mia and Barold Bellakalakova; and Max, once Blake's partner. The group meets in a warehouse to plan how to reach Gunther.