Rakuten speeds software delivery with Codex
Rakuten has integrated OpenAI's Codex as a coding agent to accelerate development, improve safety, and shorten delivery cycles. By using Codex to assist with coding tasks, code reviews, and CI/CD processes, Rakuten reports a dramatic reduction in mean time to repair (MTTR) and much faster end-to-end builds.
One of the standout results is a 50% drop in MTTR, meaning incidents are resolved faster and users experience less disruption. Rakuten also automated CI/CD reviews using Codex, reducing manual review overhead and catching issues earlier in the pipeline—improvements that directly increase release confidence and developer throughput.
The company says full-stack builds that used to take months are now achievable in weeks, thanks to Codex accelerating routine coding, scaffolding, and integration tasks. These gains let engineering teams focus on higher-value design and strategy work while the coding agent handles repetitive, time-consuming chores.
Rakuten's experience highlights a practical, positive path for enterprises adopting AI assistants: measurable efficiency and safety improvements, accelerated time to market, and happier, more productive engineering teams. As more organizations integrate coding agents like Codex, these kinds of operational wins are likely to become common in modern software development.