After completing the Infantry Officers Course,[2] he transferred to the Golani Brigade, where he was assigned as a platoon commander in the 12th Battalion.

[6] In 2006, he was promoted to the rank of lieutenant colonel and appointed commander of the 51st Battalion,[7] a position he held until 2008.

In March 2007, he dealt with a mutiny of battalion soldiers after he stopped negative norms related to the differences between veterans and new recruits.

On July 6, 2015, he was tasked with establishing the Oz Brigade,[17] and assumed his role as its first commander on December 27.

[22] On October 7, 2023, immediately upon learning of the surprise attack on Israel, he rushed from his home in the Golan Heights to the south, fighting alongside forces on the ground and neutralizing terrorist cells that had infiltrated from the Gaza Strip into the area near Kibbutz Mefalsim, participating in the Battle of Mefalsim.

[23] During Operation Iron Swords, it was revealed that in May 2023, he authored a classified document following a comprehensive, multi-system review he conducted on IDF activities along the fence with the Gaza Strip in response to various scenarios.

At the request of Gaza Division Commander Brigadier General Avi Rosenfeld, Zini outlined extreme scenarios, including the infiltration of terrorists under complete intelligence surprise, and recommended the necessary responses, concluding with remarks about the "concept" formed around the fence.

[25] Amid the possibility of new draft legislation during Operation Iron Swords, Zini was involved in the initiative to establish a new Haredi brigade, enabling ultra-Orthodox integration into the IDF while maintaining their values and subject to the rulings of the Haredi leadership.

[26] To this end, he met with Rabbi David Leibel in Bnei Brak, and upon leaving the meeting, his vehicle was attacked by extremists.