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AI Product Metrics That Don't Lie: Behavioral Signals Over Thumbs-Up Scores

· 9 min read
Tian Pan
Software Engineer

Your AI feature has a 4.2/5 satisfaction score. Users click thumbs-up 68% of the time. The A/B test shows task completion rate is up 12%. Your team ships it. Six weeks later, users have quietly routed around it for anything they actually care about.

This is metric theater. You optimized for signals that look like success but aren't. The feedback you collected came from the 8% of users who bother rating anything — skewed toward the delighted and the furious, silent on the vast middle who found the feature unreliable just often enough to stop trusting it.

Building AI features requires a different measurement philosophy than traditional software. The signals you instrument from day one determine whether you learn fast enough to improve or spend six months chasing a satisfaction score that doesn't move.

Measuring Real AI Coding Productivity: The Metrics That Survive the 90-Day Lag

· 9 min read
Tian Pan
Software Engineer

Most teams adopting AI coding tools hit the same wall. Month one looks like a success story: PR throughput is up, sprint velocity is climbing, and the engineering manager is putting together a slide deck to share with leadership. By month three, something has quietly gone wrong. Incidents creep up. Senior engineers are spending more time in review. A simple bug fix now requires understanding code nobody on the team actually wrote. The productivity gains have evaporated — but the measurement system never caught it.

The problem is that the metrics most teams reach for first — lines generated, PRs merged, story points burned — are the wrong unit of measurement for AI-assisted development. They measure the cost of producing code, not the cost of owning it. And AI has made production nearly free while leaving ownership costs untouched.