AWS Cloud Migration — E-commerce

An online retailer running on aging on-prem infrastructure needed to migrate to AWS before their data center lease expired. Black Friday was 5 months away — failure was not an option. We delivered a re-platform with zero customer downtime, then handled 3.5x their previous peak traffic on Black Friday weekend without a single incident.

• 200+ TB of product images, customer data, and transaction history to migrate
• Legacy ASP.NET Web Forms application not designed for cloud-native patterns
• 40-second page load times during Black Friday 2024 — customers abandoning carts
• PCI-DSS Level 1 compliance with strict network isolation requirements
• 5-month deadline tied to data center lease expiration

1. Application assessment — mapped every dependency, hot path, and integration before touching code
2. Re-platform approach — EC2 + ALB initially, RDS Aurora for the database, S3 + CloudFront for static assets
3. Database Migration Service with continuous sync, then 4-hour controlled switchover
4. Auto-scaling groups sized for 10× Black Friday traffic with predictive scaling enabled
5. PCI-DSS compliant landing zone with dedicated VPC, WAF, and AWS Config rules

• Multi-AZ Aurora with automatic failover (RTO < 1 minute)<\\\/li>
• CloudFront CDN serving 95% of catalog traffic from edge<\\\/li>
• Auto-scaling tied to checkout queue depth, not just CPU<\\\/li>
• Real-time cost dashboards with anomaly alerts<\\\/li>
• Comprehensive disaster recovery: full restore from S3 backups in < 30 min<\\\/li><\\\/ul>\"]"]

• 47% reduction in monthly infrastructure costs
• Page load improved from 40s to under 3s during Black Friday 2025
• Zero-downtime migration completed during scheduled window
• Black Friday 2025 handled 3.5× the 2024 traffic without incident
• Disaster recovery RTO improved from 24h to 30 minutes