Dev Team Builds Deterministic Product-Swap Tool for Ad Editing, Limits AI Use

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A software development team at Variant Multiplier tackled a real production request to replace one hearing-aid product SKU with another across an entire finished advertisement. Rather than letting an AI model rewrite the full ad — which risked altering untouched elements like music, voice quality, and pacing — engineers designed a deterministic planning system that only calls the model when a rule-based substitution cannot resolve a line. The work was delivered across five pull requests, starting with UI fixes to the transcript editor that allowed sentence-level selection and full-line retyping. A product catalog was then introduced to give the tool a formal concept of product identity, synced from a central source to avoid data duplication. The final approach produces a per-line swap plan that editors can review before any re-render is triggered, keeping AI intervention narrow and deliberate.

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