Tuomas Haapala enhanced the City-of-Helsinki/kukkuu repository by extending the event reminder lead time from one to three days, directly addressing a product owner’s request to improve user notification timing. He implemented the feature using Python, focusing on configuration management to ensure the new lead time was configurable and robust. Tuomas collaborated with the product owner and QA to validate the changes, ensuring the updated reminder flow did not introduce regressions. He documented the update thoroughly to support future maintenance and release readiness. The work demonstrated a focused approach to feature delivery, with depth in configuration and stakeholder alignment, though limited in scope.