A legacy .NET modernization plan
A practical planning guide. Adapt the checks to your environment and access approvals.
Inventory before choosing a runtime
Identify framework versions, hosting dependencies, libraries, identity integration, scheduled work and database access. Distinguish Windows-only components from portable code. Record support constraints using current vendor documentation before selecting a target.
Capture business behavior
Ask owners to identify critical journeys, integrations and data obligations. Preserve representative examples through approved test data. Build characterization checks around behavior that must survive, rather than treating compilation as acceptance.
Compare migration paths
Evaluate targeted remediation, incremental replacement and replatforming against the same constraints. Separate runtime changes from architecture changes where possible. An incremental boundary can reduce simultaneous unknowns, but requires explicit integration ownership.
Plan cutover and recovery
Agree data compatibility, release sequencing, recovery conditions and the person authorized to proceed. Validate the new slice in an appropriate environment. Rehearse recovery before retiring the old path and hand over operating guidance alongside code.
Turn the review into an owned backlog
Record findings, evidence, owner, dependency and acceptance checks. See our related service and existing anonymized case studies for broader context, not promised results.
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