The biggest legacy migration risk isn't technical... it's organizational. Business stakeholders lose patience before migrations complete, leading to abandoned half-migrated systems.
TypeScript + SaaS
Modernize legacy systems without business disruption. Strangler fig, incremental migration, zero-downtime cutover. Migrated 15+ enterprise apps. Free assessment.
The biggest legacy migration risk isn't technical... it's organizational. Business stakeholders lose patience before migrations complete, leading to abandoned half-migrated systems.
Strangler fig pattern succeeds because it delivers incremental value: each migrated capability works in production before the next begins, maintaining momentum.
Legacy system knowledge often exists only in long-tenured employees... migration must include explicit knowledge extraction before those employees leave.
Data migration is typically harder than application migration: data has undocumented invariants and historical anomalies that break clean implementations.
The 'rewrite from scratch' impulse almost always underestimates the accidental complexity that legacy systems accumulated for good reasons.
Compliance requirements that shape technical architecture
Problems I solve for clients in this space
Organizations attempt complete rewrites that take years, never finish, and leave the company running parallel systems indefinitely.
Strangler fig pattern: incremental migration with production validation between phases. Each phase delivers value and reduces risk.
Critical system behavior exists only in tribal knowledge or the minds of engineers who may leave. Migration breaks things nobody remembered.
Structured knowledge extraction before migration. Documentation of critical behaviors. Characterization tests capturing current behavior.
Legacy data has implicit relationships and historical anomalies that break when loaded into clean-schema new systems.
Data archaeology before schema design. Migration scripts handling anomalies explicitly. Validation comparing old and new system outputs.
The business can't pause operations during migration. Users need continuous access while underlying systems change.
Facade pattern exposing consistent interface. Feature flags routing to old or new implementations. Careful cutover with instant rollback.
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