Legacy system replacement & modernization
Retire the legacy app safely — discovery, data migration, parallel rollout, and a clean handoff. Modernise the stack without breaking operations.
The problem
The legacy app is brittle, expensive to maintain, and hard to hire for. Replacing it scares everyone because operations can't pause. The risk isn't the new build — it's the migration, the workflow preservation, and the cutover.
The approach
We run a risk-managed replacement engagement: discovery, archive-grade data migration, parallel running of old and new, and a phased cutover. Workflows that work stay. Workflows that don't get fixed. Operations don't pause.
What we deliver
Who this is for
- Operations leaders responsible for legacy software
- Companies on Access, FoxPro, legacy ERPs, or discontinued SaaS
- Teams stuck on spreadsheets running real operations
- Mid-market companies retiring deeply-customised CRMs
Example engagements
- Replacing a 15-year-old Access database with a modern web app
- Migrating from a discontinued vertical SaaS
- Retiring a spreadsheet-driven operations process
- Modernising a legacy on-prem ERP into a hosted system
How we deliver legacy modernization projects
Risk-managed approach to retiring legacy software with no operational downtime.
Discovery & risk assessment
Inventory current capabilities, data, integrations, and risks.
2 weeksArchitecture & migration plan
Design the replacement, map data migration, define rollout phases.
2 weeksBuild & migrate
Implement, migrate data, validate workflows with real users.
10 weeksCutover & sunset
Parallel run, cutover, archive old system, train the team.
2 weeksTimeline & budget
Typical timeline
Most replacements run 12–20 weeks. Phased rollouts can extend the calendar timeline while reducing risk.
Typical budget
Typical engagements run $37,500 to $200,000+. Larger systems and extensive migrations land higher.
Frequently asked questions
How do you avoid disrupting operations?
We run old and new in parallel, validate with real users on real data, and only cut over once the new system is proven stable.
What happens to historical data?
We extract, clean, and migrate it with a full audit trail. Historical records remain accessible — sometimes in the new system, sometimes via archival access.
What if some workflows can't be replaced immediately?
We migrate in phases. Some clients keep the old system for archival access while operations move to the new platform.
How is this different from a SaaS migration?
Off-the-shelf SaaS forces you to adapt to vendor workflows. Custom replacement preserves what works and fixes what doesn't.
Ready to start a project?
Tell us what you're trying to build and the outcome you need. We'll suggest a scope, timeline, and milestone-priced plan.
- Call971.255.2633
- Emailcreate@vadimages.com
We will respond within 1 business day.