Worked on the nix-community/home-manager repository to deliver a resilience-oriented feature focused on nullable package configuration for the QuickShell module and Mako service. Used Nix and Nix scripting to enable null values for package fields, introducing runtime safeguards that prevent system crashes when a package is not specified, such as ensuring systemd remains disabled in those cases. This approach increased configuration flexibility and safety, particularly for dynamic deployment scenarios. Demonstrated a strong grasp of configuration management and error handling within a declarative context, emphasizing robust module design and careful handling of nullable fields to reduce runtime errors and improve deployment resilience.