Kari contributed to the tailscale/github-action and SagerNet/tailscale repositories, focusing on targeted improvements to reliability and compatibility. In tailscale/github-action, Kari updated the default Tailscale version in the action’s YAML configuration, aligning it with upstream releases to reduce compatibility risks and streamline future updates. For SagerNet/tailscale, Kari restored Android file transfer directory handling by reverting a previous change, re-enabling correct use of file system operations for Taildrop on Android devices. Working primarily with Go and YAML, Kari demonstrated a careful, incremental approach, addressing specific issues while maintaining traceability and minimizing risk, resulting in stable, maintainable enhancements to CI/CD workflows and Android functionality.