Christine Wen contributed a targeted bug fix to the starsimhub/starsim repository, focusing on the Timeline component’s handling of vectorized year data. She updated the Timeline class to use the yearvec variable instead of year, correcting a conditional path to ensure accurate processing of batched multi-year simulations. This change, implemented in Python, improved the reliability and data integrity of core timeline computations by addressing a subtle issue in vectorized data handling. Christine’s work demonstrated strong debugging and refactoring skills, resulting in a more maintainable codebase and reducing the risk of user-facing errors in simulation workflows involving multi-year datasets.