This PhD project investigates the “Delft Laminar Hump,” a passive surface modification shown to significantly delay laminar–turbulent transition and reduce aerodynamic drag. The research focuses on understanding and optimizing the interaction between surface modifications and swept-wing transition using theoretical, numerical, and stability-analysis tools. Methods include adjoint-based optimization, Parabolised Stability Equations, and high-fidelity simulations. The project is supported by aerospace partners and international collaborators and aims to position Hump-like concepts as enabling technologies for ultra-efficient, low-emission aviation.