The reference for the IBM ecosystem

Become the Mainframe expert the industry needs.

Learn COBOL, JCL, DB2, and CICS through hands-on tracks. Master the critical technologies that power the global economy and future-proof your career.

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Talent Shortage

Legacy experts are retiring. Companies are actively seeking the next generation of Mainframe developers to take over.

Critical Infrastructure

Banking, insurance, transport: COBOL handles over 70% of global financial transactions. A technology that is here to stay.

Modernization

The Mainframe is evolving. Learn to interface it with modern web architectures (APIs, microservices) to bridge the gap to the future.

A unique learning methodology

We have completely rethought how to learn Mainframe to make it accessible, visual, and directly applicable to the enterprise.

Total Immersion

An enterprise terminal built right into your browser.

Forget complex setups and network configurations. With Code Legacy, you get instant access to a real Mainframe development environment.

Fluid and responsive 3270 emulator
Real-time job compilation and execution

// Terminal screenshot

Hands-on Projects

Work on real-world scenarios.

Theory is not enough. Our curriculum is built around use cases directly from the banking, insurance, and logistics sectors.

Massive bank file processing (Batch)
Resilient DB2 database architecture

DB2 Architecture

Mentorship

Technical mentorship at every step.

You are never alone when facing a system error or an abend. The platform includes personalized support to ensure you master every skill.

Detailed code reviews
JCL and CICS debugging assistance

Code Legacy Mentorship

The Modules

Our individual courses, available a la carte or as a full track.

Beginner

COBOL Foundations

Master the syntax, file management, and control structures of this historical language.

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Intermediate

JCL Automation

Learn to orchestrate your jobs, manage system utilities, and optimize batch processing.

Discover module

Intermediate

IBM DB2 & SQL

Design, query, and optimize relational databases directly on the Mainframe.

Discover module

Advanced

CICS Transactions

Develop highly performant, real-time transactional applications.

Discover module

The Logical Path

If you want to become fully autonomous, we recommend following the modules in this specific order, mirroring real-world enterprise projects.

Step 1

COBOL Foundations

Learn syntax, file management (VSAM/Sequential), and basic algorithms.

Step 2

JCL Automation

Create batch processing chains to compile and execute your COBOL programs at an industrial scale.

Step 3

IBM DB2 & SQL

Replace flat files with relational databases embedded directly within your COBOL code.

Step 4

CICS Transactions

Transition from asynchronous batch processing to real-time transactions, including terminal screen management (BMS).

Invest in your career

Transparent, commitment-free pricing to access the entire Code Legacy ecosystem.
All plans start with a 7-day free trial.

Monthly

Total flexibility, cancel anytime.

€39 / month

Access to all training modules
Quizzes, exercises, and final project
Mainframe access (Built-in emulator)
Personalized exercise reviews
Help and support via Teams

Start your 7-day free trial

Then €39/month. Cancel anytime.

Yearly

2 months free

The best choice for a comprehensive learning experience.

€390 / year

Access to all training modules
Quizzes, exercises, and final project
Mainframe access (Built-in emulator)
Personalized exercise reviews
Help and support via Teams

Start your 7-day free trial

Then €390/year. Cancel anytime.