Architecture Practice Methods

Mar 6, 2026 · R&D Management

Harness Engineering: OpenAI's 10x Codex Experiment Redefines Software Engineering

OpenAI's Harness Engineering experiment shows a 3-7 person team built a 1M-line codebase in 5 months using Codex agents without writing code, shifting engineers' role from coding to designing environments, specifying intent, and building feedback loops—revealing AI as an amplifier that makes system design and architectural understanding more critical than ever.