Worked on the terrestris/shogun-gis-client repository, focusing on both code quality improvements and enhanced test coverage for core UI components. Applied modern JavaScript and TypeScript features such as nullish coalescing and optional chaining to refactor existing code, reducing potential bugs and aligning with SonarQube standards for maintainability. Improved state management readability by restructuring useState calls and removing redundant type intersections. Later, expanded unit test coverage for components like LoadingIndicator and Measure, validating their behavior and supporting safer future refactors. Leveraged React, TypeScript, and testing frameworks to deliver a more reliable, maintainable frontend codebase with streamlined onboarding and QA processes.