This thesis’ objective is to describe the development process, in collaboration with the start-up AerisGate, of a set of python applications for mission analysis and trajectory optimization by explaining the theory behind these applications and showing the results of tests conducted. The applications are based on GODOT (General Orbit Determination and Optimisation Toolkit), a European Space Agency flight dynamics software for orbit determination and analysis, that allows to model the universe and perform spacecraft’s trajectory propagation. By combining this tool with the optimization library PyGMO, the developed applications aim to be as generic as possible, in order to analyse many types of missions.