Replit has partnered with Obsidian Systems and Tweag to enable Nix, an open-source package manager and build tool, to merge multiple remote Nix stores, bringing Nix Flakes and development environment portability to millions of Replit users. This integration aims to provide a consistent and reproducible development environment across different platforms, including Linux, Mac, CI, and production deployments. With this feature, developers can reuse their existing Nix configurations, cache their build artifacts, and access the wider Nix ecosystem. The partnership also enables the use of Nix Flakes, which provides improved user experience and code sharing. Additionally, the Layered Store primitive will be developed to mix instant installation with persistent Nix builds, allowing for a more efficient and scalable system.