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€2,000–€6,000 for a simple one-way sync, €8,000–€20,000 for bidirectional sync with mapping, €20,000–€50,000+ when a legacy system has no real API. The cost is rarely the happy path — it's error handling, auth lifecycles, and data mapping.

You don't need to rebuild your product to add AI. An API layer beside your existing stack, one high-value workflow, and evaluation before rollout — that's the pattern. Most first integrations ship in 4-6 weeks. Here's the playbook.

A practical engineering guide to adding AI features to products already in production. Model selection, architecture patterns, cost management, and the RAG vs. fine-tuning decision.