- COBOLGo
- RPGJava 21
- VB6TypeScript
- DelphiGo
- PerlRust
Languages
COBOL, RPG, PL/I, VB6, Delphi, Perl and old Java rewritten into idiomatic Go, Rust or TypeScript that your team will actually want to open.
Legacy code modernization for enterprise
Any legacy codebase.Rewritten in 30 days.
Send us the system today and get a fixed price within 48 hours. Thirty days later it runs on Go, Rust or TypeScript, on a fraction of the hardware, and gives the same answers to the cent.
- Fixed price within 48 hours
- Live in 30 days, date in the contract
- Engineers with 25+ years in production
- Air-gapped, on your premises
INTCALC.cbllegacy
COMPUTE-INTEREST. MOVE ACCT-BALANCE TO WS-BAL IF ACCT-TYPE = 'SAV' COMPUTE WS-INT ROUNDED = WS-BAL * RATE-SAV / 1200 ELSE MOVE ZERO TO WS-INT END-IF ADD WS-INT TO ACCT-BALANCE.interest.gomodern
func ComputeInterest(a *Account) { if a.Type != Savings { return } i := a.Balance.Mul(RateSavings). Div(decimal.New(1200, 0)). Round(2) a.Balance = a.Balance.Add(i)}- Parse
- Map
- Rewrite
- Verify
- Ship
parity 100%
Whatever you run today, we move it to the stack you hire for tomorrow
- COBOL
- JCL
- CICS
- RPG
- PL/I
- Fortran
- VB6
- Delphi
- PowerBuilder
- ColdFusion
- PHP 5
- Perl
- Classic ASP
- .NET Framework
- Java EE
- Struts
- AngularJS
- Oracle Forms
- PL/SQL
- DB2
- Informix
- Sybase
- MS Access
- FoxPro
- Progress 4GL
- ABAP
- Python 2
- Go
- Rust
- TypeScript
- React
- Next.js
- Node.js
- Java 21
- Spring Boot 3
- .NET 8
- Kotlin
- PostgreSQL
- Kafka
- Kubernetes
- gRPC
- GraphQL
- AWS
- Azure
- Google Cloud
- Terraform
- OpenTelemetry
- ClickHouse
- Redis
What we modernize
Languages, frameworks, databases, architecture. We take all of it.
Code, framework, schema, screens and servers move in one project. One team does it under one price and one date, and nothing stays behind waiting for a second budget.
Databases
Oracle, DB2, Sybase and Access onto PostgreSQL. Schema, stored procedures and every row, reconciled to the cent. The licence bill goes.
Architecture
One tangled deployable cut into services with owners, clean boundaries and their own release schedule.
ACCT INQUIRY ........ F3=EXIT
CUST NO: 0048213 TYPE: SAV
BALANCE: 12,408.19
LAST TXN: 2026-09-28
_
Interfaces
Green screens, WinForms and Oracle Forms rebuilt as fast web apps your staff learn in an afternoon.
- StrutsSpring Boot 3
- AngularJSReact
- WebFormsNext.js
Frameworks
Struts, EJB, WebForms, AngularJS and jQuery moved to the frameworks every engineer you hire already knows.
Infrastructure
Off the mainframe and the server under the desk. Containers, CI/CD and monitoring from day one.
Speed
30 days. Every project. In the contract.
Rewrite programs usually drag on for years and die in committee. Ours are counted in days, with the price and the date fixed before any code moves.
CodeHero
Day 1 — 30
Day 1–3
Map
The platform reads the whole codebase and maps every module, job and dependency.
Day 4–5
Plan and price
Order of work, cutover plan and a fixed price per phase. You approve, we start.
Day 6–24
Rewrite and verify
Slice by slice. Old and new run on the same inputs until the outputs match.
Day 25–30
Cutover and handover
Traffic moves over. Your team gets the code, the tests and the map.
Typical rewrite program
measured in years
- 30
- days, the ceiling on any project
- 48h
- to a fixed price and a start date
- 25+
- years in production code behind every lead engineer
- 0
- nights of batch missed during cutover
Our models
Models trained on legacy code. Not a chatbot with a prompt.
Frontier assistants learned from today's GitHub. Ours were fine-tuned on the code nobody writes any more: copybooks, JCL, RPG cycles, PL/SQL packages, Struts actions. They migrate old systems better than anything you can rent by the token, and they run on our hardware inside your building.
Fine-tuned for migration
Trained on paired legacy and modern code, so the output is idiomatic Go or TypeScript, not COBOL with new syntax.
The whole repository at once
Every language in the tree parsed in parallel into one dependency graph. Nothing falls out at the seams.
Checked against reality
A parity harness replays your recorded production traffic against old and new until they agree.
| How the work differs | General AI assistant | CodeHero platform |
|---|---|---|
| Knows COBOL, JCL, RPG, PL/SQL dialects | Partly | Yes |
| Reads a million-line repository in one pass | No | Yes |
| Proves behavior on production traffic | No | Yes |
| Runs offline, inside your perimeter | No | Yes |
| Senior engineer signs off every slice | No | Yes |
| Fixed price and a date in writing | No | Yes |
Air-gapped delivery
Your code never leaves the building.
For banks, insurers, defense and government we arrive with our own hardware and our own models, install them inside your perimeter and do the whole migration with the network cable unplugged.
How on-premise delivery worksYour perimeter
CodeHero appliance
- Fine-tuned models
- Your repository
- Engineers on site
Our hardware, your floor
GPU servers with the models preloaded, delivered and racked by us. Or your machines, if they can carry the load.
Zero outbound connections
No API calls, no telemetry, no updates. Nothing inside talks to anything outside.
Engineers on site
Our team works in your building, under your access rules, badged like your own staff.
Clean exit
At handover the code, tests and docs stay with you. The drives leave wiped, or stay with you as well.
The people
25+ years in production. The best engineers you can put on legacy.
Every project is led by engineers who have shipped production software for more than 25 years. They wrote Delphi when it was modern and J2EE when it was the future. Your system is familiar ground to them, and they already know where it breaks.
- 25+
- years in production code, per lead engineer
- 1
- senior engineer accountable for your system, start to finish
- 0
- account managers between you and the people doing the work
Every system we take off life support.
Dozens of migrations across every stack below, each one shipped inside thirty days. Find yours and see exactly what the move involves.
- Java, Python, Node12–20 days
Java / Spring Boot
Go
- Machine translates
- services, JPA entities, REST controllers
- Engineer decides
- what the framework was doing for you
- Java, Python, Node10–18 days
Python / Django
Go
- Machine translates
- views, models, Celery tasks
- Engineer decides
- the parts that were fast because of C extensions
- Java, Python, Node8–15 days
Node.js services
Go
- Machine translates
- routes, middleware, ORM models
- Engineer decides
- where dynamic typing hid a contract
- Java, Python, Node12–21 days
Ruby on Rails
Go
- Machine translates
- controllers, ActiveRecord, background jobs
- Engineer decides
- metaprogramming nobody can grep for
- Java, Python, Node12–20 days
C# / .NET Framework
Go
- Machine translates
- services, EF models, WCF endpoints
- Engineer decides
- Windows-only assumptions
- Java, Python, Node7–14 days
Python number crunching
Rust
- Machine translates
- hot loops, array code, serialization
- Engineer decides
- which precision the result actually needs
Services
Everything legacy. One team.
Rewrite it, cut its bill, keep it alive or build what comes next. Same engineers, same platform, same 30 days.
Modernize
- ModernizationPHP, VB6, Delphi, ColdFusion and old Java rewritten while the old system keeps serving.
- Mainframe and AS/400COBOL, JCL, CICS and RPG off z/OS and IBM i. Batch and green screens included.
- Monolith splitOne deployable on a shared schema, cut into services that release on their own.
- Database migrationOracle, DB2 and Sybase onto PostgreSQL. Every row reconciled, the licence bill gone.
- Framework upgradesJava 8 to 21, .NET Framework to .NET 8, AngularJS to React. Before the end-of-life date.
- Cloud migrationOff your racks and onto AWS, Azure, GCP or your private cloud, rewritten to run there.
Optimize and support
- System assessmentA map of the codebase, a ranked risk register and a phased plan with prices.
- Cost reductionHot Java and Python services rewritten in Go and Rust. Same behavior, a smaller bill.
- Technical due diligenceThe target's whole codebase read in days. Risks ranked and priced before you sign.
- Legacy supportWe take over the system nobody in-house understands. Senior engineers on call within days.
Build new
- AI developmentAgents, typed tool layers and the evaluation harness that keeps them honest.
- Custom softwareA real system where spreadsheets, Access and patient people do the work today.
- AI agentsAgents that run a business process, with a named human approving anything irreversible.
- AI consultingTwo or three use cases worth building, a baseline, and a build-or-buy call on each.
In writing
What goes into the contract.
Anyone can promise on a website. We sign it.
- § 1
Fixed price
Agreed per phase before work starts. No hourly meter running in the background.
- § 2
30-day delivery
A date in the contract, not an estimate on a slide.
- § 3
Behavior parity
The new system matches the old one on your own recorded traffic, or the phase is not done.
- § 4
You own everything
Code, tests, documentation and the dependency map. No licence, no runtime, no lock-in.
- § 5
NDA first
Signed before we see a single file. Your paper or ours.
- § 6
Zero downtime
The old system keeps serving customers until the new one has proven it can.
Questions
What CTOs ask before they sign.
How can a rewrite take only 30 days?
Models trained for exactly this work read, map and rewrite the whole repository in parallel. Our engineers, each with 25+ years in production, spend their time where judgment matters: boundaries, data and cutover. Bigger systems split into 30-day phases, each with its own price and date. Send us yours and see the plan in 48 hours.
Which languages and databases do you take?
COBOL, PL/I, RPG, JCL, Fortran, VB6, Delphi, PowerBuilder, ColdFusion, PHP, Perl, classic ASP, .NET Framework, old Java, Python 2, AngularJS and more. On the data side Oracle, DB2, Sybase, Informix, Access and FoxPro. Targets are usually Go, Rust, TypeScript, Java 21, .NET 8 and PostgreSQL.
How do you prove the new system behaves like the old one?
We record real inputs and outputs from production and replay them against both systems. Every difference is either fixed or signed off by you. Traffic moves only when the outputs match.
Our code cannot leave the building. Can you still do it?
Yes. We bring GPU servers with our models preloaded, install them inside your perimeter and work with no outbound connection at all. If you have suitable hardware, we run on yours.
What do you need from us to give a price?
A short description of the system: stack, rough size, what hurts and where it has to go. With read access to the code we come back with a fixed price and a start date within 48 hours. Most of that time is the platform reading your code, so the sooner you send it, the sooner you know.
What happens to our team?
They stay in the loop from day one, review the slices as they land and receive the repository, the tests and the dependency map at handover. Nothing depends on us after we leave.