Marcin Fortuna enhanced the GENESYS-PK/our_lib repository by developing new features for an Evolutionary Algorithm Toolkit, focusing on improving experimentation speed and maintainability. He introduced components such as SimpleClampStrategy, OnePointAverageCrossover, SphereMutation, and TournamentSelection, each designed to expand the toolkit’s flexibility for evolutionary computation. Marcin applied object-oriented programming principles and Python to refactor core modules, improving type hinting and initialization in ClampStrategy, Evolution, and FitnessFunction. These changes streamlined the codebase, reduced onboarding time for new contributors, and ensured compatibility across updates. The work demonstrated a solid understanding of software design and evolutionary algorithms within a focused, month-long effort.