Block says Builderbot handles about 15% of production code

Block rolled out Builderbot on Wednesday, saying the AI-native tooling now executes about 15% of the company’s production code changes. The system performs over 200,000 operations per day and merges roughly 1,500 pull requests each week, the company reported.

Builderbot is described as an orchestration layer that coordinates multiple AI agents across Block’s entire codebase. Unlike common coding assistants that are limited to a single repository, Builderbot is built to understand every service, API and internal convention at Block, allowing engineers to request and apply changes across teams without prior familiarity with a service.

Block said the tool routes substantial amounts of production work through the system. The company expects the system to reduce repetitive scaffolding work for engineers and shorten delivery timelines, allowing staff to focus on product decisions rather than routine coding tasks. Brad Axen, head of AI capabilities at Block, described Builderbot as “the missing layer between AI coding tools and how engineering actually works at scale.” Block added that “what used to take months now takes days.”

According to the company, an engineer working on one product can ask Builderbot to implement a change in a different service the engineer has never touched because the AI already maps how that service works. Block framed the release as part of a broader move from AI-assisted coding to what it calls AI-native engineering and said it is sharing details to inform public discussion about scaling AI across large codebases. The company noted challenges that include orchestrating AI agents across a large codebase, maintaining quality at speed and keeping humans responsible for judgment and product taste.

The announcement also provided context for workforce changes earlier this year. Block reduced staff by about 40% in February. Jack Dorsey linked those cuts to the rapid acceleration of AI work at the firm. Block did not provide figures tying the layoffs directly to Builderbot and stated the technology has materially changed how engineering tasks are assigned and completed.

Other technology companies have reported increased use of AI to generate code. Spotify uses a background agent called Honk; co-CEO Gustav Söderström reported in February that some of the company’s top developers had not written code since December. Google’s CEO Sundar Pichai said in April that roughly three-quarters of the company’s new code is generated with AI. Microsoft’s CEO Satya Nadella said in 2025 that the firm uses AI to write between 20% and 30% of its code.

Block presented Builderbot as a system intended to maintain development quality and speed while leaving final judgment to human engineers. The company said it will continue to refine the tooling across services as usage expands.