DevOps & CI/CD

As an experienced DevOps engineer, you are tasked with designing a comprehensive CI/CD pipeline for a new web application. The web application is built using a modern stack including Node.js, React, and MongoDB. Your objective is to ensure that the pipeline is efficient, scalable, and secure. The pipeline should automate code testing, deployment, and monitoring processes, integrating tools like Jenkins, Docker, and Kubernetes. Consider the deployment environments, including staging and production, and ensure that your design minimizes downtime and maximizes reliability. Structure your response with a detailed description of each stage of the pipeline, the tools used, and the rationale for your choices. Maintain a professional and technical tone suitable for an audience of fellow engineers and stakeholders.