Continuous Integration (CI) and Continuous Deployment (CD) are essential components of modern software development, promoting frequent, reliable, and automated deployment cycles. Dev container isn't just a facilitator for development workspaces but can be a powerful ally in the CI/CD pipeline by ensuring the fidelity of local development environments against deployment stages. Integrating devcontainer.json with CI/CD pipelines provides uniformity from the start, reducing the "works on my machine" syndrome and gaining confidence that code passing tests in one environment will operate similarly in production. Containerizing an application as a build environment can execute tests and builds within the same environment used locally by developers, utilizing Docker layer caching to make pipeline execution faster. Deployment scripts and configurations can be created to promote replicable builds not just for development but all the way through to production, supporting the creation of a feedback loop where insights gathered from automated tests and production deployments inform development practices and environment configurations. However, challenges such as configuration drift, security concerns, and resource constraints must be addressed with solutions like automated checks, security scanning, and regular review of resource usage. Ultimately, integrating devcontainer.json with CI/CD pipelines bolsters the robustness of development and deployment processes, fostering a harmonious synchronization between work done on developer's machines and production realities, ensuring everyone speaks the same technical language and shares the same expectations of the end product.