Legacy application modernization
Your production systems hold years of business knowledge. Fabrica learns how they work, rebuilds selected workflows on a modern stack and proves them against the running system before anything moves.
A 30-minute conversation. Bring one business priority, the system behind it and your main constraint. No production access needed.
The Fabrica board: every workflow, its stage, owner and cost. Shown with prototype data.
More room for business progress
When maintenance consumes capacity, new products and operational improvements wait. Start with the business opportunity you want to enable and the part of the system that stands in its way.
Investment
Shift spend from keeping an old system alive toward the products and operations the business wants next.
Planning
Agreed priorities, scope and review points replace open-ended rewrite commitments. An assessment sets out what it takes to begin.
Knowledge
The rules, data relationships and reports that matter become explicit, so owners review a specification instead of guessing at code.
Control
New workflows run and are compared alongside the current system. Your team approves each transition against agreed evidence.
The principle
Preserve what the business does. Replace how the technology does it.
Your production system is the specification. Fabrica treats what it actually does as the starting evidence, then turns that evidence into a reviewed System Specification: the contract we build and prove against.
How it works
Each step produces something your team can review before the next one starts.
01
Capture how the running system behaves: requests, jobs, data flows, reports and the rare paths. Anything not yet observed stays an explicit gap.
02
Owners and engineers review the evidence. At an agreed coverage and confidence level, a versioned System Specification is approved.
03
Engineering agents rebuild the scoped workflow on a modern architecture in short sprints. Engineers review every change.
04
Both systems run against the same specification. Outcomes, data, reports, permissions and performance are compared and differences resolved.
05
Production moves one bounded workflow or cohort at a time, with acceptance criteria and rollback. Then the next priority starts.
Proof before traffic
A rebuild is only useful if it does what the old system did, including the rules nobody wrote down. Fabrica compares both implementations against the same specification and shows you the result before any customer is moved.
Illustrative proof report. Each shift step is gated on evidence.
A requirement recovered from finance meeting notes, linked to the work item that implements it.
Living documentation
Most legacy systems carry rules that exist only in code and in a few people's heads. Fabrica turns observed behavior and owner reviews into requirements your team can read, question and approve, each linked to the change that implements it.
Full visibility
The work sits on a board you can inspect at any time: what is in progress, which role owns it, what it has cost so far and what is waiting on a human decision. Spending caps pause work rather than let it overrun.
Dashboard from the Fabrica prototype.
Ways to start
Both start with the same 30-minute conversation. We are testing which commercial model serves buyers best, so tell us which one you would choose.
Option A · Assessment first
A fixed-scope assessment of one workflow, a bounded pilot that proves it, then a recurring renewal plan built on that evidence.
Option B · Subscription
One monthly fee for an agreed renewal scope, with your first workflow migration included and upgrades to renewed parts covered.
A business decision, a technical partnership
For CEOs and founders
Launch the product or enter the market without betting the business on a rewrite.
For CFOs
Turn open-ended modernization into a planned, measurable line of spend.
For CIOs
Lower the risk held in old systems and in the few people who understand them.
For CTOs
Specifications, proof results and rollback your engineers can verify. Rails first.
Who's behind Fabrica
Fabrica is being developed by Thinslices, a product engineering company that has designed, built and scaled software for clients from fintech and insurance to telecoms, publishing and retail.
200+
projects delivered
13+
years building products
160+
engineers, designers and product people
Selected Thinslices clients. These are Thinslices engagements, not Fabrica customers.
Common questions
No. Keeping a stable system, upgrading it or refactoring a narrow part may be the better investment. Fabrica's reconstruction approach is for cases where replacement earns its place, and the first conversation is where we find out.
Not by default. Parallel builds and incremental replacement do not need a whole-system freeze. If a freeze is needed for a specific scope, we agree what it covers and how long it lasts before work starts. Our target is days or weeks for an agreed scope, and a pilot measures it.
A business leader sponsors the work. Your CTO or engineering lead partners on scope, evidence and acceptance, and your technical team decides when each workflow shifts.
Thirty minutes on one business priority, the system behind it and the constraints on changing it. You leave with a suggested first scope. No production access is needed.
Book a 30-minute conversation about one priority and the system behind it. You leave with a practical first step.