Building EU-Compliant AI Support Agents: Engineering Trade-offs for French E-Commerce

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Developers building AI support agents for French online shops face strict data residency requirements, meaning customer data, model inference, and retrieval must all remain within EU infrastructure. The author runs one self-hosted instance per merchant in France using an open-weight French model, Mistral, ensuring every data hop — from customer message to order lookup — stays within mapped, auditable EU systems. While open-weight models hosted locally underperform the largest US-based models on general benchmarks, the narrow scope of e-commerce support tasks makes them adequate when paired with tightly curated, merchant-specific knowledge bases. Retrieval quality becomes the critical engineering challenge, with agents restricted to citing only facts returned with a verified source, keeping responses traceable and accurate. Crucially, support logs and transcripts also count as personal data, so observability tooling must remain EU-hosted to avoid undermining the entire compliance framework.

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