The Migration Journey

The Case: A 10-year-old .NET Framework 4.5 monolith running on a single Windows Server 2012. It crashes once a week and cannot handle traffic spikes.

1. Phase 1: Re-platform (Modernize)

We migrated the code to **.NET 8** and containerized it using Docker. This allowed us to move from expensive Windows EC2 instances to high-performance **Linux Fargate** tasks.

2. Phase 2: Decouple (Cloud-Native)

We moved the file uploads to **S3**, the session state to **ElastiCache (Redis)**, and the main database to **Amazon Aurora**. We added an **ALB** for high availability across 3 Availability Zones.

3. The Result

The application now scales automatically from 2 to 50 containers. Uptime improved from **98%** to **99.99%**. The team now deploys 5 times a day instead of once a month. The monolith is now a distributed, cloud-native workhorse.

AWS MASTERY FOR .NET ARCHITECTS COMPLETE.

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