Designing AI Systems That Swap from Rules to ML Models Without Touching the Frontend

Louis Wieshofer — Sun, 05 Apr 2026 18:32:26 +0000

When you're building AI for enterprise clients, you need a working demo fast — but you also need the architecture to scale to production-grade ML later.

We solved this with a pattern we call the Predictor Interface.

The idea is simple: every intelligent component in our system — whether it runs on hand-crafted rules or a trained ML model — implements the same abstract interface. Same input. Same output. Same API response.

The frontend and API layer never know what's running behind the scenes. A config change swaps the engine. No code changes. No redeployment of the frontend. No breaking changes.

This gives us three things:

Speed: We can ship a rule-based demo in days
Flexibility: When real data arrives, we swap in XGBoost, BERT, or whatever fits
Safety: If a model underperforms, we switch back to rules in one line

The pattern has worked well for us across multiple components — scoring engines, classification systems, anomaly detection, and more.

If you're building AI systems that need to evolve from prototype to production without accumulating tech debt, this approach is worth considering.

Happy to discuss implementation details in the comments.

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Designing AI Systems That Swap from Rules to ML Models Without Touching the Frontend