Legacy System Migration Guide
Practical guide to modernizing legacy systems without business disruption.
What is this guide about
Legacy systems are systems that still function and deliver value, but their maintenance is becoming increasingly expensive and risky. Outdated technologies, lack of documentation, and growing technical debt limit a company's ability to innovate.
Legacy system migration is one of the most complex IT projects. It requires deep understanding of existing business logic, careful planning, and a gradual approach that minimizes the risk of downtime.
This guide presents proven migration strategies - from analyzing the existing system, through choosing an approach (big bang vs strangler fig), to testing and cutover. Each step considers business and technical realities.
Key topics
Start with a full audit - map dependencies, document business logic, and identify critical data. Talk to users who know the system best. Discover "hidden logic" - business rules coded into the system that nobody remembers.
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