Modernize one business process at a time

OpenLegacy connects legacy discovery, specification, and runnable modernization in one incremental path. Find the business operations inside your applications, define clear boundaries from evidence in the code, and convert the components that matter most into modern, executable services.

Why legacy modernization programs stall

Your legacy applications hold decades of proven business rules. Yet most programs try to move everything at once, without a clear view of what the code does.

Limited visibility into legacy behavior and dependencies

Business operations, data lineage, and cross-application dependencies are often hidden across COBOL, RPG, maps, copybooks, files, and databases.

Modernization designs are disconnected from the system of record

Teams struggle to turn discovered legacy behavior into reviewable specifications, API boundaries, and implementation decisions.

Big-bang rewrites introduce unnecessary risk

Moving application logic, interfaces, and data together makes it difficult to preserve business behavior and validate each modernization step.

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A proven path to modernization, one business process at a time

Every business capability follows the same three steps.

Reverse engineering

Pick a business process and point us to the sources. We discover everything at the source (apps, dependencies, data and screens), then auto-generate a full spec: workflow, business rules, data models and roles.

Smart integration

Expose your legacy functions as governed APIs, and simulate every change to validate it before anything moves. Legacy and modern systems keep running side by side, with zero disruption.

Forward engineering

Rebuild into your target platforms and cloud services. Choose your approach (reimagine, refactor or replatform), your platform and your LLM, with no vendor lock-in.

Why teams modernize by business process

You move beyond high-risk rewrite programs. Each increment follows evidence from your code base, so teams modernize logic in manageable steps and validate behavior early.

Logic and data transitions stay independent, so application logic can leave the host before the data does.

Discover and prioritize real business capabilities

Identify operations, group them into candidate domains, trace data paths, and see the dependencies that shape modernization risk.

Turn discovery into an actionable modernization blueprint

Build business-process specifications from discovered operations, identify API integration points, and create runnable artifacts for stakeholder validation.

Modernize incrementally with validation built in

Convert selected CICS/COBOL/BMS, IMS/COBOL/MFS, and RPG/DSPF applications into runnable JVM-based programs, while keeping flexible options for host, sandbox, or modernized data access.