Technical debt is the future cost of shortcuts taken in code today. AI makes it easy to produce a lot of code quickly, which can pile up duplication, inconsistent patterns and unclear structure faster than a team can notice. Avoid it with small reviewed changes, clear standards, regular clean-ups and a rule that nobody merges code they cannot explain.
How AI code builds debt
- Duplication. The AI writes a new helper instead of finding the existing one.
- Inconsistent patterns. Each prompt produces a slightly different style, so the codebase becomes a patchwork.
- Over-engineering. Extra layers and abstractions nobody asked for.
- Dead code. Unused functions left behind after changes.
- Shallow tests that give false confidence.
- Lost intent. The reason for a decision lives only in a chat that nobody saved.
- Dependency sprawl. New packages added for small tasks.
Warning signs
| Sign | What it means |
|---|---|
| Changes keep breaking unrelated features | Weak structure and tests |
| Nobody can explain how a module works | Code merged without understanding |
| Several ways to do the same thing | Inconsistent patterns |
| Long, tangled files | Missing structure |
| Fear of touching code | Debt has become risk |
Keep it healthy
- Give the AI your standards. Share conventions and examples, and ask it to reuse existing code.
- Keep changes small and review each one.
- Refactor regularly. Schedule time to remove duplication and dead code.
- Keep tests meaningful, and run them on every change.
- Record decisions. Short notes on why, kept in the repository.
- Limit dependencies. Add one only with a reason.
- Use a single structure for folders, naming and error handling.
- Measure. Track how long changes take and how often they break things.
When it is already bad
You can recover. Stabilise first with tests around the behaviour that matters, then refactor in small steps, or rebuild the worst parts. See rescuing an AI-built MVP.
Why it matters for the business
Debt shows up as slower features, more bugs and higher cost to change. A system you cannot change is a risk to the business, not just to developers. See our custom software development service, and use this review checklist to keep quality up.