Tenant-Invisible Migration
SaaS tenants cannot experience downtime or data inconsistency during migration. Every phase requires dual-write strategies and validation before any traffic shifts to AWS.
Cloud Migration
AWS Cloud Migration for SaaS Companies
We migrate SaaS platforms to AWS with strategies designed for multi-tenant architectures — tenants never experience the migration, custom domains keep working, and your engineering team ships features throughout.
- The current estate is inventoried.
- Assessment models post-migration TCO and a 7R path per workload.
- Rehost moves what should move as-is, with MGN or DMS where they fit.
- Refactor lands what should land on managed services or containers.
- Cutover waits for the agreed window.
- The workload is live on AWS with the roster still attached.
Key Challenges We Solve
Multi-Tenant Database Migration
Migrating databases that serve multiple tenants requires schema compatibility gates — the new database schema must work with both old and new application versions during the transition.
Custom Domain Continuity
SaaS products that provision custom domains per tenant (customer.yourapp.com) require careful DNS migration — wildcard certificate transfers, Route 53 zone configurations, and zero-downtime DNS cutovers.
Billing & Usage Data Continuity
Usage metering, subscription billing data, and tenant analytics must migrate without gaps — missing usage data can result in billing errors and customer disputes.
Our Approach
Blue-Green SaaS Migration
Run production on the source environment while building and validating the target AWS environment. Shift traffic incrementally — starting with new tenant signups, then progressively migrating existing tenants by tier.
Expand-Then-Contract Database Migration
Apply backward-compatible schema changes first (expand), deploy new application version that supports both schemas, migrate data, then remove old schema columns (contract) — all with zero application downtime.
Tenant Communication & Rollback Plan
Migration runbook with per-tenant cutover steps, automated rollback triggers based on error rate thresholds, and a communication plan for proactive status updates to enterprise tenants.
Frequently Asked Questions
How do you migrate a SaaS database without downtime?
We use AWS DMS for continuous replication from the source database to the target RDS/Aurora instance. Once replication lag is under 1 second, we freeze writes for 30-60 seconds, verify final sync, update the application database connection string, and resume writes on AWS. Total downtime is typically under 2 minutes.
How do you handle tenants on different pricing plans during migration?
We migrate tenants in cohorts by plan tier — starting with free/trial tenants to validate the process, then paid tiers in ascending order of risk. Enterprise tenants with contractual SLAs are migrated last, in coordination with their account managers, during agreed maintenance windows.
What is the rollback procedure if something goes wrong mid-migration?
DNS-based rollback can restore traffic to the source environment within 60 seconds by updating Route 53 weights. DMS replication continues in both directions during the migration window, so the source database remains current. Rollback is a well-rehearsed procedure we test in staging before any production migration.
Ready to Get Started?
Talk to our AWS experts about aws cloud migration for saas companies.