Worked on the brain-tec/odoo repository to address a critical issue affecting eCommerce checkout reliability. Focused on backend development using the Odoo framework and Python, the developer identified and resolved a singleton error in the cart controller’s delivery amount calculation logic when multiple delivery lines were present. By isolating the bug and implementing a targeted fix, the solution stabilized delivery pricing flows, ensuring accurate totals and reducing the risk of incorrect charges. The work was carefully scoped to minimize regression risk and was well-documented, directly supporting business goals by improving customer trust and streamlining support for the checkout process.