March 2025 performance summary (City-of-Helsinki/helsinki-design-system) Key deliverables: - DateInput Formatting Enhancement: Added an optional 'format' prop to the DateInput component to allow consumers to specify the date display format; defaults to 'd.M.yyyy' when not provided. Commit: b974a78c1c0e871f6e130102f7c41dfa93519533 (feat: add optional date format prop to DateInput component). Key achievements: - Implemented a flexible DateInput API that enables consistent date rendering across consumers without breaking existing usage. - Maintained backward compatibility by preserving default formatting behavior when the new prop is not supplied. - Set the foundation for localization-ready date formatting in the design system, reducing ad-hoc formatting work in consuming apps. Material impact and accomplishments: - Improves UX consistency for date presentation across apps and components, reducing confusion and formatting errors. - Lowers maintenance cost by centralizing date formatting logic in a single component API. - Demonstrates forward-leaning API design within the design system, supporting localization and internationalization efforts. Technologies/skills demonstrated: - React component API design, TypeScript prop typing, and semantic commit messaging. - Design-system discipline: stable feature flag / default behaviors while enabling customization. - Collaboration impact: single-source enhancement with clear ownership (City-of-Helsinki/helsinki-design-system) and traceable commit.