My work revolves around theory and modeling of semiconductor and superconductor nanostructures. During my PhD I investigated how spin of charge carriers in few-electron quantum dots and open systems like quantum wires is affected by coupling to spatial degrees of freedom and how one can use this coupling to electrically alter the spin. Currently I investigate properties of semiconductor-superconductor hybrid structures. These fascinating devices are used for realization of topological phases and for engineering of quasi particles that obey non-abelian statistic. I particularly focus on structures realized in gated nanowires and two dimensional electron gas studying charging spectra, disorder effects and multi-terminal geometries.