By observing differences in the oscillation behaviour of neutrinos and antineutrinos, the T2K experiment has provided the first hints of CP violation in the lepton sector. Building on this, the Hyper-Kamiokande (Hyper-K) experiment — currently under construction in Japan — aims to make a definitive discovery of leptonic CP violation and perform precision measurements of neutrino oscillation parameters. The Hyper-K detector, to be installed in the world’s largest artificial underground cavity, will deliver significantly higher event statistics compared to its predecessor, Super-Kamiokande. As a result, the limiting factor in measurements will no longer be statistics but rather systematic uncertainties. In this talk, I will discuss my contributions as part of the Hyper-K group at TRIUMF, focusing on our efforts to understand and reduce these systematic uncertainties — a crucial step toward realizing the full physics potential of Hyper-K.