In June 2025, Yabir G. focused on backend development and smart contract interaction within the nicholasyoder/rotki repository, addressing a targeted bug in the token transfer flow. He updated the Python-based transfer payload to exclude gas-related fields, such as gas, maxFeePerGas, and maxPriorityFeePerGas, ensuring that gas parameters are set exclusively by the consumer. This change reduced the risk of conflicting or incorrect gas estimations, resulting in more reliable and predictable token transfers. Yabir’s disciplined approach to payload design and version control demonstrated a strong understanding of blockchain transaction mechanics and contributed to a more stable integration experience.