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Developers feel 20% faster. They are measurably 19% slower. That 39-point gap between perception and reality is not a rounding error. It is the opening symptom of a productivity paradox now visible across every serious dataset on AI-assisted software development.

This episode examines the mounting evidence that AI coding assistants are not accelerating delivery. They are mortgaging it. Review time has climbed 91%. Refactoring has collapsed by 60%. Code cloning has risen eightfold. Logic errors and security vulnerabilities are propagating at rates that outpace the review capacity of the teams shipping them. The output looks like speed. The system behaves like debt.

We investigate the structural mechanism behind the paradox. AI tools raise the floor of code production while quietly lowering the ceiling of code comprehension. Developers ship code they did not write, cannot fully explain, and increasingly cannot debug. The skill most essential for validating machine-generated output is the exact skill that atrophies fastest when that output is trusted. Meanwhile, additive patterns (copy, paste, regenerate) displace the consolidative patterns (refactor, reuse, move) that historically kept codebases maintainable. The result is a fragmentation signature now measurable at industry scale.

The interest rate on this debt is high because it compounds along three axes simultaneously: generation velocity, human comprehension decay, and architectural fragmentation. Traditional debt accrues linearly with deferred cleanup. AI-induced debt accrues superlinearly because the mechanism that produces it also erodes the capacity to repay it.

We close with the emerging countermeasures. Spec-driven development. Automated governance guardrails. Architectural review gates positioned upstream of the commit, not downstream of the incident. The organizations treating AI velocity as a raw productivity input are accumulating liabilities they cannot yet see. The organizations treating it as a force multiplier that demands new governance infrastructure are the ones that will still be shipping in three years.

The question is not whether AI makes coding faster. The question is what you are borrowing against to get that feeling of speed, and when the repayment comes due.

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The High Interest of Leveraged AI Technical Debt

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The High Interest of Leveraged AI Technical Debt