New particles and fundamental states, as well as further structure of known particles and new forces, are predicted by numerous extensions of the Standard Model at energy scales of the order of the TeV. Over the course of Run-I, the Large Hadron Collider (LHC) has provided an impressive amount of proton-proton collisions at an energy in the center of mass of 8 TeV, and the ATLAS experiment is preparing for the new 13 TeV start-up. Since the LHC is a copious source of particles interacting with quarks and gluons, hadronic jets represent a window to new phenomena that could occur at the highest energy scales ever reached by a particle collider. This seminar presents an experimental view of searches in hadronic signatures performed at the ATLAS detector, with a particular focus on the techniques used to reconstruct jets.