We move legacy systems onto a modern stack and verify — automatically — that the new system behaves exactly like the one it replaced. Behavioral parity, on your code, proven before you cut over.
The business logic lives in code no one fully understands, written by people who've left. So teams freeze on a system they can't safely touch — or gamble on a rewrite no one can verify.
We capture how your current system actually behaves — real inputs, real outputs, real data flows. We rebuild it on a modern stack. Then we replay your system's own behavior against the new one and prove they match — evidenced in a report you can audit.
We capture the legacy system's real behavior as ground truth — not documentation, not memory, the system itself.
An AI build engine — artifact gates, automated QA at every step — rebuilds on your target stack, fast. It doesn't get a vote on whether it's right. That's step 3.
We replay your legacy system's real behavior against the new build — independently, case by case. A rebuild can pass its own tests and still be wrong; parity is what catches it. "Done" means the parity check passes, not the model's say-so.
"Done" isn't our opinion. It's a passing parity check — objective, automated, and yours to audit.
A faithful rebuild reproduces the old system exactly — bugs and all. That's the contract: no silent "improvements" that quietly change what your business runs on. But we don't let the defects hide. Parity surfaces the legacy system's latent flaws — stale regulatory thresholds, silent rounding loss, missing audit records — and routes each one to a named owner for a signed decision. Faithful by default; changed only on the record.
We flag known-wrong behavior the rebuild faithfully carried forward — outdated rules, truncation, dropped records — independent of any rewrite.
Each flag goes to a named owner: reproduce it, fix it, or formally accept it. Never silently carried, never silently changed.
Every ruling is signed and logged. Each deliberate deviation from the legacy system is a decision on the record — not a surprise in production.
You don't just get a modern system. You get a signed account of every place the old one was wrong.
Bring us one self-contained program. We modernize it and hand you a parity report proving it behaves identically. Proof on your code before any commitment.
Upload your program →We modernize your platform program by program, each parity-verified — priced to the value of the outcome, a fraction of the rebuild alternative.
Once modern, every new feature and fix flows through the same parity gates — automatically re-verified against your system's proven behavior, logged, and shipped without re-introducing risk.
Hands-on delivery, remote or on-site, when you want us in the room alongside your team.
TurkeyCode is an open-source AI build engine. At weekend scale it's a free CLI. At enterprise scale it's Turkey Enterprise — the same gated pipeline, pointed at legacy systems, with deterministic parity proof on top.
Describe an app, build it, deploy it. Free, MIT-licensed, self-hostable. Where the engine — and the community — lives.
The enterprise pipeline: capture, rebuild, and prove behavioral equivalence on your production systems — with delivery and IP terms built for it.
No commitment, no rip-and-replace. One self-contained program, modernized, with a parity report in your hands. Decide from there.