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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.

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Summary

Migrate your SaaS platform to AWS without tenant disruption. Tenant-invisible cutovers, multi-tenant database migrations, custom domain DNS cutover, and zero-downtime deployment strategies.

Key Facts

  • • Migrate your SaaS platform to AWS without tenant disruption
  • • Tenant-invisible cutovers, multi-tenant database migrations, custom domain DNS cutover, and zero-downtime deployment strategies
  • • Every phase requires dual-write strategies and validation before any traffic shifts to AWS
  • • com) require careful DNS migration — wildcard certificate transfers, Route 53 zone configurations, and zero-downtime DNS cutovers
  • • Blue-Green SaaS Migration: Run production on the source environment while building and validating the target AWS environment

Entity Definitions

RDS
RDS is an AWS service relevant to aws cloud migration for saas companies.
Aurora
Aurora is an AWS service relevant to aws cloud migration for saas companies.
Route 53
Route 53 is an AWS service relevant to aws cloud migration for saas companies.
multi-tenant
multi-tenant is a cloud computing concept relevant to aws cloud migration for saas companies.

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.

Related Content

Key Challenges We Solve

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.

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.

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