Worked on the stacks-network/stacks-core repository to deliver a Nix flake-based build and development environment, enabling reproducible builds and streamlining onboarding for stacks-node and stacks-signer. Centralized Nix configuration under contrib/nix to ensure consistent build processes across multiple components and repositories. Updated versioning for stacks_node and stacks_signer to reflect upstream changes, aligning development and release workflows. Leveraged Nix, TOML, and Rust toolchains to orchestrate multi-repo builds and manage dependencies. This work improved CI reliability, reduced setup complexity, and established a robust foundation for future development, focusing on build systems, DevOps practices, and version control within the project.