Solution
Modernize a legacy system without a full rewrite
We migrate legacy systems in stages, beside the software that is still in production, so the business does not stop for a rewrite.
The problem
The current system makes every change slow, and nobody is confident in the release.
The outcome
A system the team can change, with the old path retired in stages.
Fit
Who this is for
- Engineering leaders inheriting legacy stacks
- Teams losing velocity to incidents and tech debt
- Companies modernizing for an acquisition or audit
What you get
- A staged migration plan
- Typed boundaries around each part that moves
- A release path, observability, and a way to roll back
- Documentation the next engineer can read
Deliverables
- Migration plan with sequencing, risks, and rollback paths
- Typed, modular replacement for each bounded context
- Observability stack covering both old and new during cutover
- Architecture decision records and onboarding docs
How it runs
How the engagement is organized.
Map
The boundaries, the dependencies, and where change is most expensive.
Plan
A staged migration, with a way back at each step.
Migrate
One part at a time, checked against the system it replaces.
Hand off
The new path documented, and the old one retired only when it is safe.
Services we use here
The building blocks
The services that usually sit inside this kind of engagement.
Related work
Projects in this area
Enterprise Logistics Platform
A staged rebuild of a long-running logistics platform
An incremental move off a monolith, planned so the existing system could keep running.
Staged
Migration planned one domain at a time
Shadow
New paths exercised before cutover
Compliance SaaS Startup
A first compliance product, scoped for a real release
An early SaaS build focused on the workflow a customer would use.
Scoped
First release limited to one workflow
Billing
Payments included in the product
FAQ
Modernize your legacy system — common questions
- Rarely, and not as a default. We move one part of the system at a time, with the old and new paths running together until their behavior matches. The cutover should be a controlled switch, not an event.
- As long as the parts you need to move, and the risk around each one. A meaningful first cutover and a full retirement are different projects. We will say which one the proposal covers.
- That is the reason to migrate in stages. Feature work continues in the part of the system that is live. We coordinate so the migration and the product work do not block each other.
- That is common. Before we replace a behavior, we try to capture it with tests drawn from how the system actually runs. The point is a version the team can read.
Discuss this engagement.
Tell us where the product is today. We will reply with a clear view of how we would approach it.