Worked on enhancing the reliability of pipeline construction within the SpinalHDL/SpinalHDL repository by addressing a critical bug in Builder.scala. Focused on handling orphan nodes, the work involved implementing rules to correctly process null up/down connections and dependencies that were already resolved, thereby preventing improper seeds and reducing edge-case failures. This approach improved the predictability and stability of graph-based hardware description language generation. Utilizing Scala and hardware description language expertise, the developer applied precise debugging and commit-driven changes, resulting in a more robust pipeline builder and lowering downstream maintenance costs for complex dependency and graph analysis scenarios.