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The PR-Bot That Never Sleeps: When Your Reviewers Become the Rate Limiter

· 11 min read
Tian Pan
Software Engineer

For two decades the bottleneck in software engineering was writing code. We optimized IDEs, autocompletion, refactoring tools, and frameworks to make typing cheaper. We won. Now the bottleneck moved one step downstream: writing is cheap, and reading is expensive. The PR-bot can spin up ten implementation attempts in parallel and open ten pull requests against your repo before you finish your morning coffee. Your reviewers cannot.

The rate limiter for AI-assisted software delivery is no longer the model's tokens per second. It is the number of human eyes you can put on a diff per day. And when those eyes get overwhelmed, you do not get a graceful degradation — you get rubber stamps. Code merges with LGTM 🚀 on top of code that nobody actually read. A senior engineer approves an AI-written patch that another AI tool already reviewed, and three weeks later a data-inconsistency bug eats forty hours of someone's life. Surface correctness is not systemic correctness, and a green pipeline is not understanding.