Worked on the koreader/koreader repository to deliver Python 3 support within the development shell by updating the shell.nix configuration. Focused on DevOps and environment configuration, the work enabled Python development and scripting directly in the development environment, streamlining onboarding and ensuring consistent tooling for contributors. Leveraging Nix for reproducible setups, the update reduced setup time and improved workflow consistency across developer machines. The approach demonstrated proficiency in Nix and shell scripting, with careful attention to version control practices. No bug fixes were recorded during this period, as the primary focus was on feature delivery and enhancing the development environment.