The hard question is who leads.
An integration can be built quickly, but it only stays usable if you settle beforehand which system owns each data object. Customer, order, article, price — each needs one system in charge, or the sync produces conflicts nobody can resolve.
Typical counterparts are SAP and other ERP systems, Microsoft Dynamics 365, data warehouses and industry-specific systems. Technically the decisive factor is rarely the product itself, but whether it has a documented interface.
And we build so the whole thing can be audited: every sync is logged, and errors are reported rather than swallowed. A failed sync should be noticed in the morning, not in the quarterly report.
What usually sits on the other side.
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SAP and other ERP
The ERP normally stays the leading system for order and article; HubSpot reads from it rather than writing back.
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Microsoft Dynamics 365
A second CRM in the landscape needs a clear split per object, or both sides quietly overwrite each other.
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Warehouse and BI
Reporting is fed on a schedule rather than per event — an evaluation does not need the record a second after it changes.
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Industry systems
Specialist tools hold data nothing else has. What they own stays with them, and only the result is synced across.
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Shop and billing
Orders and invoices arrive from the shop or the billing system; HubSpot shows them without taking ownership of them.
Interfaces that outlast their builders.
Lead per object
Which system wins when the two disagree is decided before anything is built.
Monitored interfaces
Logged checks, reported errors — no silent failures.
Direction and cadence
Event-based where it triggers a process, scheduled where it feeds an evaluation.
Documented and maintainable
Still understandable once the people who built it have left the building.
