Engineering
From Polyrepo Fragmentation to Monorepo Leverage
Migrating 450 Cash App backend repositories into a single scalable monorepo

Every engineering problem tells a story. Here, we share the breakthroughs, lessons, and experiments that shape how we think, how we build, and how we expand access to the global economy.
Migrating 450 Cash App backend repositories into a single scalable monorepo

Turning CI failures into clear actionable feedback

How Block Engineering codified tribal knowledge for AI

Measuring the Cognitive Complexity of Human-AI Collaboration

How We Verify Container Image Signatures and Attestations at Scale

Inside Block’s approach to AI-assisted development, from repo readiness to multi-agent workflows.

Lessons from Operation Pale Fire

Coordinating expensive operations across multiple agents


Applying the CORS Model to Agents
