As part of my Ph.D. studies, I worked in the reconstruction of multi-strange hadrons (Ξ, Ω, and anti-particles) in Pb-Pb collisions at the Large Hadron Collider (LHC) at both 5.02 TeV and 2.76 TeV with the ALICE detector. Historically, the strangeness productions was the first proposed signature of the Quark-Gluon Plasma, a state of matter that existed short after the Big-Bang, and measuring these particles at the LHC energies helps shed light on this state of matter, increasing our knowledge about the history of our universe.