At Netlify, the company believes in the simplicity of the JAMstack and is thrilled that developers are contributing to its success. However, issues with site builds can arise when a developer's carefully crafted development environment isn't compatible with Netlify's build system, which clones the repository, sets up a Docker container, downloads cache from previous successful builds, and runs specified build commands in a recent version of Ubuntu Linux. To debug these issues, developers can use Netlify's CLI, which should run their build nearly-identically to the original build process, allowing them to identify similar error messages and potentially resolve the issue by specifying the correct versions of build tools, such as Node.js, Ruby, Python, or PHP, and configuring access permissions for private repositories.