Alex Holas focused on reliability and stability improvements across the artis-mcrt/artis and artis-mcrt/artistools repositories, addressing critical bugs in C++ and Python codebases. In artis-mcrt/artis, Alex resolved a logic flaw in the DO_TITER option, ensuring per-timestep iterations matched intended counts and eliminating compilation errors, which enhanced simulation configurability. For artis-mcrt/artistools, Alex improved the data processing pipeline by refining the add_derived_columns_lazy function to handle cases where the dfmodel is absent, preventing runtime assertion failures and supporting robust data manipulation. These targeted debugging efforts demonstrated depth in build systems, data analysis, and collaborative problem-solving within complex scientific software.