During a two-month period, Bruno Castell worked on system-level improvements for Fuchsia using C++ and system programming skills. In the AvaloniaUI/angle repository, he developed a helper to simplify Fuchsia IO2 service connections, removing manual handle management and enabling direct access to named services, which streamlined migration to IO2 and reduced boilerplate. Later, in the dart-lang/sdk repository, he modernized the Fuchsia runtime API by integrating new fdio functions, aligning runtime behavior with Fuchsia API level 28 and reducing technical debt. His work focused on maintainability and migration readiness, delivering targeted features without addressing bug fixes during this timeframe.