Worked on improving component reliability in the sumup-oss/circuit-ui repository by addressing a bug in the Anchor component related to custom rendering with the 'as' prop when an 'href' was present. Applied a test-driven approach using TypeScript and React, adding regression tests to ensure that custom components passed via the 'as' prop render correctly alongside 'href'. Made targeted adjustments to the rendering logic to support proper prop composition, enhancing consistency across theming and routing scenarios. Integrated these changes into a CI-ready workflow, focusing on robust testing and accessibility. The work strengthened the component’s contract and improved overall UI reliability.