JapanTechnology and telecom2025 – ongoing

Rakuten

Claude Code across engineering teams

Rakuten reports time to market down 79% after adopting Claude Code

WorkingVendor's case studyVendor ↗

Problem

Engineering work such as large codebase changes and feature delivery took long, with a monorepo update estimated at over a month by hand.

Approach

Engineers used Claude Code for tests, API mocks, bug fixes, documentation and code review, often running several sessions in parallel. In one task Claude Code worked autonomously for 7 hours in the 12.5-million-line vLLM library. Non-engineers also got access, and specialist agents for product, sales, marketing and finance were set up.

Results

79%reduction in time to marketVendor's case study[1]

24 to 5 daysworking days for a task, before and afterVendor's case study[1]

Takeaway

Anthropic reported a seven-hour autonomous coding run at Rakuten.

Sources

Rakuten customer story
Anthropic2026Vendor publication

Source summaries

[1]Anthropic2026

Anthropic describes Rakuten's use of Claude Code and managed agents in engineering and business teams. It reports a 79% cut in time to market and a 7-hour autonomous coding run.

Full details are in the original sources.

Added 25 Oct 2026 · Updated 25 Oct 2026