Marketplace App · Fasteer Factory

Your legacy regenerated in weeks, not years.

VB6, COBOL, RPG in the new stack — module by module, with demonstrated equivalence.

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The problem

The experts who know these systems are retiring.

1

VB6, COBOL, RPG: critical code written 20–40 years ago that still runs the business — but no one can maintain it.

2

Traditional rewriting projects take years, cost millions, and often fail — with all the business risk borne by the customer.

3

Without a demonstrable equivalence strategy, you can never prove that the new code does exactly what the old one did.

How it works

One module at a time. Every difference is yours.

We analyse your software, propose a plan, you approve it. Then we regenerate it module by module in the new stack, demonstrating that the new behaves like the old. Every difference is your decision, not a surprise.

01

Analysis

Complete scan of your software: perimeter, dependencies, effort per module. Black on white before any commitment.

02

Plan and approval

We propose the sequence of work. You approve, adjust or stop. We don't proceed without your sign-off.

03

Regeneration, module by module

Each module is rewritten in the new stack. We verify that the new behaves like the old: every difference is shown to you and waits for your decision.

04

Delivery without lock-in

Code, tests, CI/CD and documentation stay yours. You pay for the result, not consumption. The IP stays with you.

The method is proprietary FoolFarm technology, patent-protected. In the PoC you see it working on your data; architectural details are shared under NDA.

What you get

Modern code. Demonstrated equivalence. No lock-in.

VB6, COBOL, RPG, Delphi, PowerBuilder

All major legacy languages converted to .NET 8, Java 21, Node.js/TypeScript, PHP 8, Kotlin — the target stack you choose.

Behaviour verified, documented

Every module is delivered with executable tests and an immutable audit log. You can re-run the verification at any time.

Split-view comparison VB6 → C#

Old code and new code side by side, with inline differences. The context to make every decision.

Business rules extracted and documented

The business rules buried in legacy code are extracted and documented in natural language — readable by anyone, even without the developers who wrote them. At the end of each module: code, tests, CI/CD and documentation. Yours, forever.

The guarantees

The AI proposes. You decide.

Every non-trivial difference between old code and new code passes through an explicit approval gate — your decision, not a surprise.

The decision on the differences remains yours: you see context, impact and Fasteer's recommendation — you approve or reject.

The legacy stays in production until the module passes all equivalence tests — zero risk of downtime.

IP, code, tests and CI/CD remain entirely yours — no dependency on Fasteer after delivery.

How it activates

Assessment first. Then one module at a time.

01

Assessment

2–3 weeks. Fixed price. Codebase scan, dependency map, module-by-module effort estimate. Black on white — before any commitment.

02

PoC on pilot module

One real module transcoded with demonstrated equivalence — verified on behavioural tests. Proof before rollout, not a presentation.

03

Rollout

Incremental, one module at a time. You pay for the result, not the consumption.

Pricing

You pay for the result.

Assessment

Fixed price, defined before the start. No surprises.

PoC

Milestone payment — you pay when the equivalence-tested module is delivered.

Rollout

Per module or per KLOC, by complexity band. Starting from €250/month for the licence.

IP

Yours. Forever. No recurring fees for code you already own.

Start with the Assessment. Know the perimeter before committing.

2–3 weeks. Fixed price. At the end: codebase map, dependency map, effort estimate per module. Black on white.

Book a demo