Worked on reliability and stability improvements for the artis-mcrt/artis and artis-mcrt/artistools repositories, focusing on targeted bug fixes in C++ and Python. Addressed a critical issue in artis-mcrt/artis by refining the DO_TITER option’s iteration logic, resolving compilation errors and ensuring per-timestep iterations matched intended counts, which enhanced simulation configurability. In artis-mcrt/artistools, implemented a robustness fix in the data processing pipeline to handle cases where the data model is absent, preventing runtime assertion failures and improving workflow resilience. Emphasized debugging, build systems, and data manipulation, delivering minimal, low-risk patches that increased maintainability and reliability across both codebases.