ASOS builds custom PR review agent after GitHub Copilot accelerates code output

ASOS is a London-based e-commerce fashion retailer serving 17 million customers globally. The company migrated all of its repositories from Azure DevOps to GitHub specifically to access the agentic capabilities built into the platform, and has since rolled out GitHub Copilot to more than 90% of its engineering workforce. Engineers report that the amount of code they are manually writing has dropped significantly, though they continue to spend substantial time on solution design.

The acceleration in code output created an unexpected downstream problem: more pull requests than the team could efficiently review.

The acceleration in code output created an unexpected downstream problem: more pull requests than the team could efficiently review. ASOS responded by building a custom agent that analyzes each pull request, breaks it down into distinct stages, and guides engineers through the review process. The result, according to the team, is that engineers spend less time on routine toil and more time delivering features that resonate with customers — a priority in what the company describes as a highly competitive, fast-moving industry where code needs to ship daily.

Key facts

1. 01ASOS is a London-based e-commerce fashion retailer with 17 million customers worldwide.
2. 02The company migrated all repositories from Azure DevOps to GitHub to access agentic platform capabilities.
3. 03Over 90% of ASOS engineers are using GitHub Copilot.
4. 04Increased code generation led to a higher volume of pull requests, creating a new bottleneck.
5. 05ASOS built a custom agent that analyzes pull requests, breaks them into stages, and guides the review process.
6. 06Engineers are writing less code manually but still spending significant time on solution design.

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