Overview
Big-bang rewrites fail often. We wrap, replace and retire parts of the old system one at a time, with both running side by side until the new part is proven.
AI helps here too: reading old code, writing the documentation nobody wrote, and generating tests before anything is changed.
Who it is for
- Companies running core systems that few people still understand.
- Teams blocked from new products by an old system with no API.
- Leaders facing end-of-support dates for platforms they depend on.
What you get
- An assessment of what to keep, wrap, rewrite or retire.
- APIs over legacy systems so new products can use them.
- Staged migration with both systems running side by side.
- AI-assisted code understanding and documentation.
- Tests that capture today’s behaviour before it is changed.
How it runs
- Assess the system, its users, its data and its risks.
- Write tests and documentation for the parts that matter.
- Put APIs in front of the old system.
- Replace one part at a time, with rollback.
- Retire the old parts once the new ones are proven.
In practice
- A core-banking or mainframe process exposed through an API for a new business-banking app.
- A desktop application moved to the web in stages.
- An undocumented codebase mapped and documented with AI help before a rewrite.
Technology
- API gateways and integration layers.
- Java, .NET, Python and Node.js for new services.
- Cloud migration tooling on AWS, Azure and Google Cloud.
- AI code assistants for analysis and documentation.
How we charge
A fixed-fee assessment, then fixed-scope stages with dates.
Questions
Will the business have to stop during migration?
No. Old and new run side by side, and each stage has a rollback plan.
Can you add AI without replacing the old system?
Yes. An API over the old system is often enough for an assistant or an agent to use it.
Talk to the team
Two-week, fixed-fee discovery. Production release by week 12.
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Let’s talk about what you want to ship.
Start with a two-week, fixed-fee discovery. You get a ranked portfolio, an architecture, a cost model and a fixed-price build plan.