The presence of Dark Matter (DM) has only been observed through gravitational effects, and its particle nature still remains unknown. One promising class of candidates are Weakly Interacting Massive Particles (WIMPs), which may be produced in proton-proton collisions at the LHC. A high–pT jet recoiling against missing transverse momentum, known as the “mono-jet” topology, is one of the most sensitive channels to search for and constrain WIMP production. I will present the latest results obtained by the ATLAS experiment, including the complementarity with direct detection experiments and other collider searches.