Marina contributed backend development work to the ersilia-os/ersilia repository, focusing on optimizing online source checks within the codebase. She implemented logic in Python to allow selective skipping of certain online source consistency validations, which reduced unnecessary processing and improved runtime efficiency. Marina also refreshed the messaging system to clearly indicate when checks were skipped, enhancing operator visibility and clarity. Additionally, she simplified the internal return structure of the _perform_deep_checks function, making the codebase easier to maintain and debug. Her work demonstrated a thoughtful approach to maintainability and operational clarity, though it was limited in scope to a single feature.