Rakuten Cuts Fix Time 50% Using OpenAI's Codex

Global e-commerce and internet giant Rakuten is reporting dramatic efficiency gains by integrating AI directly into its software development lifecycle. The company has leveraged OpenAI's Codex, an AI coding agent, to slash its Mean Time to Resolution (MTTR) for software issues by an impressive 50%. Codex automates key aspects of the continuous integration and continuous delivery (CI/CD) pipeline, including code reviews. This automation allows Rakuten's engineering teams to ship software faster and with greater safety. The impact is substantial: where full-stack builds previously took months, they can now be delivered in a matter of weeks. This case study demonstrates the tangible, bottom-line impact of AI-assisted development beyond simple code generation. By embedding an AI agent into the review and deployment process, Rakuten has created a more resilient and rapid development engine. The reduction in MTTR means less downtime and quicker feature iterations, providing a significant c