Data migration consulting services cover moving data between systems during a replacement: extraction, mapping, transformation, and the reconciliation that proves it worked.
Moving infrastructure and applications is a separate discipline and lives on the infrastructure page.
What Data Migration Consulting Services Involve
Extraction from the legacy system. Frequently the hardest part: undocumented schemas, a vendor who charges for an export, and fields whose meaning left with an employee in 2017.
Mapping. Source field to target field, written down, with transformation rules alongside. Every unmapped field becomes an explicit decision to migrate, archive or drop it.
Transformation and cleansing. A migration is the one moment when cleaning up is cheap, because everything is being touched anyway. Duplicate records, dates stored as strings and fields that changed meaning mid-history all get resolved while the data is already in motion.
Reconciliation after cutover. Row counts, control totals, and a sample traced end to end by a human. This is the deliverable that proves the migration worked.
A rollback plan that was tested. Tested, not written. Documents do not restore systems at 3am on a Sunday.
Exceptions, Quantified Before Cutover
The old system stores an address as one text field. The new one has five. Two hundred thousand records go through a parser and ninety-six percent land correctly.
We measure that exception rate during discovery, list the records, and assign them to somebody before the switch. A four percent exception rate is manageable when it is known and owned.
Among data migration service providers, publishing that number before cutover rather than after is the difference worth paying for.
Legacy Migration, Read Before Quoting
Paid discovery comes first on every legacy migration: what is in the source, what shape the target expects, what does not map, and what the exception volume will be.
That produces a written plan with a reconciliation approach and a rollback procedure attached. Legacy software migration quoted before anybody has opened the source system is an estimate that will move.
Where you need to migrate your data on a fixed date, discovery is what makes that date credible.
Senior People Through Cutover
The engineer who wrote your mapping document runs the cutover and the reconciliation. That continuity is why the exception list matches the data.
Then fixed price against the migration itself, with reconciliation as a named deliverable rather than an assumed courtesy. Data migration consulting services that price reconciliation separately are the ones that still perform it the week the schedule slips.
You get the mapping document, the scripts and the reconciliation output, all of which you will want the next time this happens. Tell us what is being replaced and when.
Related Services
Where the source data is already inconsistent, that is data quality and governance, and it is cheaper to fix during the move.
Where ongoing pipelines feed the new system afterwards, that is data engineering. Where reporting has to be rebuilt on the new platform, that is dashboards or Power BI. ERP replacements run alongside Dynamics consulting.