Anthropic:
At Anthropic, coding is no longer the bottleneck to building systems or doing research. Claude is able to autonomously iterate on research loops, micro-optimize complex programs, and build new services from the ground up at a speed and scale we haven’t seen before. The bottleneck, now, is all of the developer infrastructure built for human scale: source control, builds, and CI.
In May 2026, Anthropic averaged around 2,500 code changes merged per day; as of September, we merged over 30,000 per day.
In order to support this growth, we built Scion, an in-house version control system, and fully migrated our monorepo from git in five months.
Scion isn’t the only way to scale for agents. Cursor’s Git at any scale describes Continuity, a git store that keeps a write-ahead log in S3 as the source of truth and treats every repo on disk as a disposable cache. It came along as Tobi Lütke was frustrated with Shopify’s internal git system, so he implemented it over a weekend as walgit: an open-source Rust git server that runs as one binary in front of an S3 or GCS bucket, with no database and no leader, serving fetch, push, LFS and fast bundle-based clones even for repos larger than the machine serving them.
Ryan Dahl noted what makes this pattern practical now: S3 has supported compare-and-swap since 2024, so walgit can use the bucket for both storage and coordination.
Two months later, all of Shopify runs on an internal version that has diverged so far Tobi can’t maintain the public one:
Leave a Reply