Ivan Lagunovsky focused on improving navigation reliability in the LedgerHQ/ledger-secure-sdk repository by addressing a critical bug affecting single-page views. He implemented targeted changes in C to the navigation state logic, ensuring the Next button was disabled when only one page was present and refining access conditions to prevent navigation errors. This work enhanced the user experience by clarifying navigation behavior and eliminating confusion in single-page scenarios. Ivan applied his skills in C programming, UI development, and embedded systems to deliver a precise, well-scoped fix. The contribution demonstrated careful attention to edge cases and improved the stability of the SDK’s interface.