Niklas focused on enhancing the reliability of the EngineNode build script in the elixir-lang/expert repository, addressing a persistent issue where the process could hang or fail silently. Using Elixir and leveraging concurrent programming techniques, Niklas refactored the initiation flow to ensure the build script handled exit signals safely by running the Port within a Task that traps exits. Diagnostic logging was added to surface the last output line, aiding in debugging and reducing downtime for developers. This backend development work, co-authored with doorgan, resulted in a more robust and transparent build process, improving stability for ongoing engine development.