Codex’s integration centers on three priorities—Build faster, Build safer, and Operate smarter—anchoring incident response, automated reviews, and autonomous project execution.

Rakuten aims to shift engineers toward drafting clearer specifications and verifying outputs, supported by cross-team workshops rather than line-by-line code checks.

Rakuten, a 30,000-employee global innovator, uses OpenAI Codex to accelerate software delivery while upholding security.

A practical demonstration shows Codex delivering a full-stack solution (Python/FastAPI backend and Swift/SwiftUI iOS app) without step-by-step human guidance.

In CI/CD, Codex conducts automatic code reviews and vulnerability checks aligned with Rakuten’s internal coding principles to ensure consistency and guardrails.

Codex contributes to roughly a 50% reduction in mean time to recovery by accelerating incident response.

Yusuke Kaji, General Manager of AI for Business, drives an operational AI agenda focused on speed, safety, and autonomy in engineering workflows.

Codex enables autonomous development by executing larger projects end-to-end from partial specifications, such as delivering a mobile app from a web-based AI agent service in weeks rather than months.

The rollout codifies internal coding principles within Codex to maintain standards while boosting development velocity.