Interface contracts instead of silos: connecting ERP, CRM and shop

ERP, CRM and shop share data — but rarely a clear leading logic. We clarify which system leads, what belongs in the middle, and how interface contracts replace silos without crushing operations.

Marc Hillen works from Bitbrew integration projects: failure modes, versioning, monitoring and the decisions that keep maintenance bearable over years. The focus is ownership, not yet another middleware layer.