Worked on the stripe/stripe-node repository to address a critical issue affecting the accuracy of JSON Content-Length calculations in server requests. The solution involved replacing Buffer.byteLength with TextEncoder to ensure the true byte length of JSON payloads was computed, directly resolving issue #2499 and improving the reliability of outgoing API requests. This backend development task required a strong understanding of TypeScript and API integration, focusing on the correctness of data transmission between services. By refining how JSON payload sizes are measured, the work reduced potential server-side errors and retries, contributing to more robust and predictable backend communication in production environments.