Agentic AI for legacy modernization

Modernize the systems you can't afford to break.

Coddee.ai reads your entire legacy codebase, recovers the business logic buried inside it, and rebuilds it on a modern stack, one verified module at a time. It runs inside your environment, and your engineers approve every change.

On-premises, cloud or hybrid Human review on every change Built in Israel
coddee › migrate › statement-balance
LegacyRPG on IBM AS/400
C     CONTNO        CHAIN     CONTRACT
C                   IF        %FOUND(CONTRACT)
C                   EVAL      BALANCE = PRINC
C                             + LINKAGE + INTRST
C                   ENDIF
ModernPython service
def statement_balance(contract_no: str) -> Decimal | None:
    contract = contracts.find(contract_no)
    if contract is None:
        return None
    return (contract.principal
            + contract.linkage + contract.interest)
# gate: output reconciles with the legacy system
analyzer✓ planner✓ coder✓ reviewer✓ debugger✓ waiting for engineer approval

Illustrative example

Why replacements fail

A replacement project fails when nobody knows exactly what the old system does.

Mapping a large system in full used to be measured in person-years, so in practice nobody did it. Teams sampled, asked around, and filled the gaps with assumptions. The gaps came back in year two, as overruns and wrong numbers.

The whole system, never a sample

Months of analyst work now takes days, so every program, table and interface gets read.

A specification that stays current

The spec is regenerated from the system itself, so it does not go stale while the project runs.

Gaps surface at the start

Open questions reach a business owner early, when answering them is cheap. That is the real saving.

What we do

One platform, three ways to put it to work.

Coddee.ai applies agentic AI to the engineering of large, long-lived software systems: understanding them, modernizing them, and keeping them maintained afterwards.

Modernize

Legacy modernization

We move long-lived, business-critical systems onto modern architecture without losing the logic buried inside them.

How we modernize →
Engineer

Agentic AI engineering

A mesh of specialized AI agents analyzes, plans, codes, reviews and tests, inside your own network.

Explore the platform →
Enable

AI training and adoption

Programs that take management and staff from curiosity to informed, practical use of AI at work.

See AI enablement →

Before and after

Same rules. Same numbers. A different working day.

A buyer's account on a legacy AS/400 green screen, and the same account in the modernized application.

BeforeAccount inquiry on the AS/400 green screen
 ACC110          BUYER ACCOUNT INQUIRY                06/10/26
 DEMO01                                               14:32:07

 Company . : 01     Site . : 0412     Bldg . : 03
 Unit  . . : 0022   Contract : 0048811
 Buyer . . : DEMO BUYER A

 Ln Due date Cd   Principal   Linkage Interest        Paid
 01 15/07/25 01  250,000.00  4,120.50     0.00  254,120.50
 02 15/01/26 01  400,000.00  9,870.25     0.00  409,870.25
 03 15/07/26 02  400,000.00  7,410.00   612.40        0.00
 04 15/01/27 02  350,000.00  5,902.75     0.00        0.00
 05 DELIVERY 01  600,000.00      0.00     0.00        0.00

 Balance due . . . :   1,363,925.15                     Bottom

 F3=Exit  F5=Refresh  F9=Print statement  F12=Cancel
AfterThe same account in the new application
Demo Project North / Building 3 / Unit 22
Demo Buyer AContract 00488111 payment overdue
Paid₪663,991
Balance due₪1,363,925
Index linkage₪27,304
Interest₪612
Paid 33%Overdue 20%Upcoming 17%On delivery 30%
DueAmountStatus
15 Jul 2025₪254,120.50Paid
15 Jan 2026₪409,870.25Paid
15 Jul 2026₪408,022.40Overdue
15 Jan 2027₪355,902.75Upcoming
On delivery₪600,000.00On delivery

Illustration with demo data. These are not actual customer screens.

See more before and after examples →

How it works

Six agents. One engineering workflow.

Asking a single model to translate files gives you translated files. Coddee.ai runs a team of agents that mirrors an engineering team, and hands every result to your engineers for the final call.

Orchestratorroutes the work between agents and loops until the module passes
  1. AnalyzerMaps modules, dependencies and interfaces
  2. PlannerOrders the work into dependency-aware tasks
  3. CoderImplements each task
  4. ReviewerChecks the result against the goals
  5. DebuggerValidates it with your build and tests
repeats as many times as the module needs
Human review: your engineers accept, correct or reject every change.

Explore the platform →

Who it is for

Built for regulated, high-stakes environments.

If these five sentences describe your organization, the platform was designed around your constraints.

Core systems that cannot simply be replaced

They accumulate decades of embedded rules, and the people who remember why retire faster than the code does.

Zero tolerance for financial error

Old and new run in parallel, and balances, guarantees and postings must reconcile before anything touches production.

Data that cannot leave the perimeter

Regulated data and proprietary code stay inside the network. The on-premises architecture was designed for exactly that.

Auditability as a baseline

Traceable changes, scoped permissions and human sign-off on every accepted modification are built into the workflow, not bolted on for the regulator.

A workforce that must be brought along

Adoption succeeds or fails on whether staff understand what the tools do and where the limits are.

AI changes the pace of the work, not the control of it.

Decisions and accountability stay with people. Every change the platform proposes is traceable and waits for an engineer to accept it. Nothing reaches production because an AI decided it should.

How we keep you in control →

Start here

Bring us the system everyone is afraid to touch.

Start with a conversation. If there is a fit, we prove it on a small, representative part of your own code, inside your own environment.