Worked on the NomicFoundation/hardhat repository to deliver a new feature for the Hardhat Flatten task, enabling users to specify an optional --output parameter that writes flattened smart contracts directly to a file. This enhancement involved updating the task definition and action handler to support file-based output, improving automation and CI integration by allowing deterministic outputs for downstream tools. The implementation included adding comprehensive tests to ensure correct behavior and regression safety. The work was carried out using JavaScript and TypeScript, leveraging skills in CLI development and Node.js to streamline contract management workflows without introducing any major bug fixes.