Worked on the espoon-voltti/evaka repository to deliver a Coefficient Precision Enhancement feature, introducing four-decimal validation and upgrading the relevant database column to support higher precision. This change improved the accuracy of assistance-need calculations, resulting in more reliable analytics and better-informed business decisions. The implementation involved careful database migrations, robust input validation, and adherence to strong version control practices. Utilizing SQL and TypeScript, the developer demonstrated skills in database design, management, and front end development. The work focused on enhancing data quality and calculation reliability, contributing to a more precise and maintainable system for end users and stakeholders.