Block's New AI Tool Now Writes 15% of All Its Production Code Changes

Block announced Builderbot on June 17, 2026, an AI orchestration layer built to solve a specific problem the company says it kept hitting despite two years of AI investment across its engineering organization.

Coding tools work well inside a single repository. None of them could operate across hundreds of millions of lines of code, hundreds of services, and the full complexity of how Block actually builds software, according to the press release.

Builderbot runs inside Slack. An engineer tags @builderbot with a short description of what they need, a bug fix, a migration across services, a new feature, and the system gets to work directly in the thread.

Multiple team members can collaborate with it in real time, watching it research, plan, and implement while they steer the direction, without switching to a separate development environment.