Client:
“Can you review our 10-year-old .NET Framework system and share a fixed-cost migration estimation to .NET Core today?”
Then came the second surprise:
“There is no documentation… because the system was developed feature-by-feature over many years as requirements came in.”
This is the reality of many long-running enterprise systems.
Over time:
• different developers contribute,
• business rules keep changing,
• quick fixes get added,
• dependencies evolve,
• database structures expand,
• and undocumented workflows silently become business critical.
From outside, it may look like:
• “Just migrate old .NET to .NET Core.”
But internally, it is often:
“Understand 10 years of hidden business logic before changing anything safely.”
And this is exactly why modernization projects become risky when estimation is rushed.
Without proper analysis, businesses can face:
• broken workflows
• production downtime
• missing business logic
• unexpected redevelopment
• massive timeline overruns
• critical features discovered too late
A serious migration project is not only a technology upgrade.
It is a deep reverse-engineering exercise.
At PRISHUSOFT, before giving realistic estimations for legacy modernization, we usually focus on:
• codebase analysis
• dependency mapping
• architecture review
• undocumented workflow identification
• database & API assessment
• risk analysis
• phased migration planning
Because in legacy systems…
The biggest complexity is usually not the code you can see.
It is the business logic nobody documented.
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