Over a three-month period, this developer contributed to the City-of-Helsinki/yjdh and kukkuu repositories by delivering platform upgrades, codebase cleanups, and quality governance improvements. They upgraded kukkuu to Django 5.2 with Python 3.12 and PostgreSQL 17, enhancing deployment flexibility and security through environment-based configuration and improved database handling. In yjdh, they removed deprecated features, implemented robust error handling for decision detail processing, and introduced SonarQube for backend code quality analysis. Their work emphasized maintainability and deployment reliability, leveraging Python, Django, and Docker, while standardizing environments and automating quality gates to support future development and smoother CI/CD workflows.