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Question: What are the key architectural, technical, and business considerations when migrating from a legacy system built on C#, VB.NET, Delphi, SQL, and PL/SQL to a modern Java-based architecture using AWS and OpenShift?

Answer: When migrating from a legacy system to a modern architecture like Java, AWS, and OpenShift, key considerations include:

Understanding the Existing System

• Functionality: Identify core business processes, workflows, and dependencies.
• Non-Functionality: Evaluate performance, scalability, security, and compliance requirements of the legacy system.

Data Migration

• Ensure data consistency and integrity while migrating databases from SQL and PL/SQL.

Code and Architecture Transformation

• Map old technologies (C#, VB.NET, Delphi) to the new Java-based stack, redesigning as needed.

Automation and Testing

• Write new automated tests for the modern architecture, or rewrite existing ones to fit Java and AWS environments.

Performance and Security

• Optimize the system for cloud-native performance and integrate security best practices.

Incremental Approach

Adopt a phased migration to reduce risks and minimize downtime.