Change platforms without losing data, orders or sleep

Platform migrations move an application, store or system from one technology to another: an outdated framework to a supported one, a self-hosted ecommerce platform to a SaaS platform, or an on-premises database to a managed cloud service. Each carries risk because the business depends on the existing system every day.

Planning starts with inventory. Document features, integrations, data entities, custom reports, scheduled jobs and URLs. Many migrations fail because a small but essential function, such as a nightly export to the accounting system, was never documented and is discovered missing after launch.

Decide what to migrate as-is, what to improve and what to retire. Migrations are a good opportunity to remove unused features and clean data, but changing too much at once increases risk. Separating the move itself from major redesigns often works best. Infrastructure moves frequently accompany platform changes. Where hosting also changes, coordinate with cloud migration planning so environments, networking and security are ready before application cutover.

Data is the hardest part of most migrations. Records must arrive complete, correctly transformed and linked to related records, from customers and orders to inventory and financial history. Errors discovered after go-live damage trust and can be very expensive to correct. The checks below are essential.

Validation should be automated wherever possible. Scripts compare counts, totals and checksums between source and target systems, producing reports that business owners can review and sign off. Business users should verify samples in the new system, checking that familiar records look correct. They often notice issues, such as wrong statuses or missing notes, that automated checks overlook. Repeat validation for every trial migration and the final cutover, so results are consistent and problems are fixed before go-live.

Cutover is the moment users and traffic move to the new platform. A big-bang cutover switches everything at once during a planned window, which is simpler but riskier. Phased cutovers move users, regions or features gradually, reducing risk but requiring both systems to run in parallel for a period.

Techniques such as blue-green deployment keep the old and new environments available simultaneously, so traffic can be switched back quickly if serious problems appear. Data synchronization during the transition period ensures no transactions are lost in either direction. Rehearsals are essential. Running the full cutover sequence in a test environment, timing each step and practicing rollback, reveals problems while there is still time to fix them and gives the team confidence.

After cutover, hypercare provides intensive monitoring and support for several weeks, with quick fixes for issues and close communication with users and business owners. Agree in advance when hypercare ends and normal support takes over, and keep the old system available read-only until everyone is confident.