Worked on the stripe/stripe-go repository to address a critical issue in subscription billing logic, focusing on improving pricing stability for subscription orders. Implemented a targeted bug fix to the Subscription Proration Logic, ensuring that only initial orders are prorated on the frontend, which brought frontend pricing calculations into alignment with backend processes. This adjustment reduced the risk of erroneous subscription charges and helped prevent customer confusion, ultimately lowering support overhead. The solution was developed using Ruby and leveraged skills in API integration and backend development, with changes carefully scoped and validated against representative billing scenarios to ensure accuracy and reliability.