The T-15 is the heavy infantry fighting vehicle variant of the Armata Universal Combat Platform which also forms the basis of the T-14 MBT. Being a 'heavy' IFV designed for urban combat, its maximum weight is considerably higher than that of a normal IFV; at over 40 tons it weighs around as much as its MBT counterpart. This is largely due to the provision of considerable armor protection which is complemented by next generation Malakhit explosive reactive armor (ERA) as well as the Afganit active protection system that provides both soft kill and hard kill capability against incoming projectiles (both systems are also found on the T-14). The floor is also reinforced for added protection against mines and IEDs. The main structural difference with the T-14 is that the engine is located at the front of the vehicle, the rear troop compartment can hold as many as nine infantrymen protected by a slat armor cage. The T-15 has a modular armament fit, which can include three different remotely controlled turrets with either 30-mm or 57-mm autocannon, as well as Komet-M or Ataka AGMS (plus secondary machine guns). The T-15 is believed to be in service with the Russian Army in small numbers though total planned production is still unknown. No export clients have been announced.

The T-15 (Obyekt 149) was first observed in the 2015 Moscow Victory Day Parade alongside the T-14, although it only entered service various years later. Modular armament fits include the Bumerang-BM remote control weapons station (RCWS) with a 2A42 30-mm gun, twin 7.62-mm coaxial machine guns and Kornet-M ATGMs. Alternatively, the AU-220M Baikal RCWS can be installed with a 57-mm BM-57 autocannon and Ataka ATGMs. Finally, the DUBM-57 Kinzhal RCWS includes the same gun and missiles as the Baikal but with a 7.62-mm machine gun.