Two-way sync is where most HubSpot integrations break. Field-level mapping, an explicit system of record per object, and conflict rules you agree before anything writes. From $4,999.
- Map
- Normalize
- Sync
scope-based
Who this is for
Revenue operations lead running HubSpot for marketing and Salesforce for sales, where the two systems disagree about who a contact is and which record is current.
The pain today
- Contacts exist twice because no system owns the match key
- A field edited in one system silently overwrites the other
- The native connector syncs what it supports and stops at your custom objects
- Sync loops fire when both systems write to the same field
- Nobody can explain why the two dashboards report different numbers
The outcome you get
- Field-level mapping agreed in writing before any build work starts
- Deduplication and association handling on every record that lands
- An audit trail from any HubSpot record back to its source payload
- Rate limit handling, retries, and idempotent writes as standard
- Code, infrastructure, and documentation yours as work made for hire
Why the native connector runs out of road
HubSpot includes a Salesforce connector and it handles the common path competently. It maps standard objects, it syncs on a schedule, and for a team running stock configurations on both sides it is often enough. I will tell you to use it when it fits.
It runs out of road in four predictable places. First, custom objects: if you model what you actually sell in a custom object on either side, the mapping gets thin fast. Second, deduplication: the connector matches on email, and if your Salesforce records came from a different source with a different email convention, you get two contacts for one person. Third, conflict resolution: when both systems can edit the same field, someone has to decide who wins, and a generic connector cannot make that call for your business. Fourth, visibility: when a number looks wrong, you need to trace a record back to the payload that created it, and a black-box sync cannot give you that.
Field-level mapping agreed in writing before any build work starts
What a system of record per field actually means
Two-way sync is not one decision, it is one decision per field. Lifecycle stage might belong to HubSpot because marketing owns it. Account owner might belong to Salesforce because sales owns it. Deal amount might belong to Salesforce with HubSpot read-only. Email might be writable from either side with last-write-wins and a conflict log.
Writing that down is the actual work. Once the ownership table exists, the code is straightforward: each sync direction respects the table, loop protection stops an echo from counting as a change, and every conflict lands in a log you can read. Teams that skip this step end up with a sync they are afraid to trust, and the usual outcome is somebody quietly turning it off and going back to CSV exports.
2M+: Records processed.
Certified on this specific integration
I hold the HubSpot Salesforce Integration Certification, which covers installing, implementing, troubleshooting, and maintaining the Salesforce integration, alongside the HubSpot Data Integrations Certification for assessing use cases and data requirements. Both are current and verifiable at HubSpot Academy from the credentials section on the service page.
Certification is not the same as delivery experience, which is why the Reevia case matters more: four source systems, over 2 million records, sub-50-second sync, in production in under four weeks.
Proof this scales
Reevia ran four separate platforms and none of them fed HubSpot in usable shape. Records arrived raw, inconsistently formatted, and with no shared identifiers across systems. I built the integration layer that connects all four: batch ingestion over HTTP, normalization and mapping per source and object type, and upserts with full association handling. Over 2 million records processed. A lead captured in any of the four platforms reaches HubSpot, standardized and pipeline-ready, in under 50 seconds. The whole thing reached production in under four weeks.
What this costs
The published floor is $4,999 and the real number comes from the mapping audit, in writing, before any build work starts. Five things move it: how many source systems feed HubSpot, how many records exist, whether data flows one way or both, which HubSpot objects are involved, and how much history needs backfilling. Two-way sync is the largest single jump, because both sides can write and every field needs an owner, a conflict rule, and loop protection. You can price your own scope on the calculator first. Every engagement carries a 14-day money-back guarantee and a 1-year bug warranty.
Recent proof
A comparable engagement, delivered and documented.
Four systems, one source of truth: HubSpot visibility for one of Brazil's largest vet networks
Built a custom integration layer connecting four source systems into HubSpot for one of Brazil's largest veterinary companies. Leads sync in under 50 seconds.
Read the case studyRelated services
The same work, framed for a different situation.
Frequently asked questions
The questions prospects ask before they book.
Yes. Custom objects on either side are part of the mapping work, including association labels and the rules that keep them correct as records change. This is one of the most common reasons teams outgrow the native connector.
By agreeing a match key before any record moves, and by normalizing both sides to it. Email alone is not enough when the two systems were populated from different sources. The mapping audit defines the key, the fallback rules, and what happens when two records genuinely tie.
The ownership table decides. Each field gets a system of record, and where both sides can legitimately write, a conflict rule and a log entry. You agree that table in the audit, before anything is built.
Not always. Some teams keep it for the standard objects it handles well and add custom work only for the parts it cannot reach. Which way to go is part of the audit, and if the connector alone covers you, I will say so.
From $4,999. The exact figure comes from the mapping audit, in writing, before any build work starts. Two-way sync sits above the floor because every field needs an owner and a conflict rule.