Tencent Advertising Technology

Sep 17, 2026 · Backend Development

From Copilot to Loop: AI-Driven Legacy Refactoring via Data Cut Planes

Tencent's ad platform evolved from human-led refactoring with AI Copilot to Loop Engineering—a closed-loop system using data cut planes for observable verification and four specialized agents to automate refactoring of a 300k-line service, cutting cycle from months to weeks and manual diffs from 9 to near zero.