Tobias Bier developed a Zellij integration for the nnn file manager’s preview plugin in the jarun/nnn repository, enabling users to launch file previews directly within Zellij panes and expanding support for terminal multiplexers. He implemented this feature using Shell scripting and plugin development techniques, ensuring a clear commit history for maintainability. In the okTurtles/forkana repository, Tobias addressed configuration reliability by correcting a settings key typo in Go and improved authentication by making token expiration dynamically configurable. His work demonstrated depth in backend development and configuration management, focusing on usability, traceability, and robust handling of authentication and plugin workflows.