Legacy Systems Migration

Legacy Modernization Without Betting the Business

SanguineIT helps enterprises migrate legacy applications — monoliths, outdated ERP extensions, custom VB/COBOL-adjacent systems, and on-premise stacks — to modern web, cloud, and API architectures with phased delivery that keeps operations running during transition.

Our modernization programs start with discovery and risk assessment, then apply strangler patterns, data migration validation, parallel run periods, and cutover planning — so stakeholders see progress incrementally rather than waiting years for a single go-live event.

Specialized paths for .NET migration, Java/.NET upgrades, and pre-migration audits.

Legacy migration capabilities we deliver

• Discovery & assessment — Codebase inventory, dependency mapping, and modernization options analysis.
• Replatform & refactor — Cloud hosting, containerization, and modular extraction strategies.
• Data migration — ETL validation, reconciliation, and rollback-tested cutover scripts.
• API facades — Wrap legacy systems with modern APIs while replacement components ship.
• Parallel run & UAT — Side-by-side validation before decommissioning legacy environments.
• Decommission planning — Sunsetting legacy infrastructure with documented sign-off.

Modernization roadmaps your board and engineers both trust

Legacy migration is as much change management as engineering. SanguineIT delivers executive roadmaps with cost and risk estimates alongside sprint-level delivery plans — measuring success through reduced operational cost, improved uptime, and faster feature delivery post-migration.

View case studies or contact us for a legacy modernization assessment.