Developed a Docker-based development environment for the excalidraw/excalidraw repository, focusing on enabling seamless CodeSandbox integration and improving local onboarding. The work involved creating a Dockerfile and configuring build, test, and run task scaffolding, along with managing environment variables for both development and production workflows. Leveraging skills in Docker, Node.js, and TypeScript, the developer updated documentation to reflect the new setup, ensuring clarity for future contributors. This feature enhanced reproducibility and streamlined testing processes by standardizing the local environment, prioritizing stability and consistency for developers working on the project. No major bugs were addressed during this period.