Free your business logic from the mainframe. Then run it anywhere.
Decades of business rules are trapped in legacy languages like COBOL that fewer people can read each year. We recover a complete, technology-free picture of what your business actually does and rebuild it as clean Java microservices. In weeks, not years.
The situation
Mission-critical, and quietly becoming a liability.
Every year the people who understand these systems get harder to find, the bills get bigger, and the questions from regulators get sharper.
Vanishing expertise
The engineers who wrote it are retiring. The language isn't taught anymore.
Escalating cost
Legacy workloads cost a multiple of modern cloud-native equivalents.
Regulatory weight
Traceability and evidence are expected — and largely undocumented today.
Innovation blocked
The mainframe sets the pace. New products, integrations, and regulatory changes wait on systems only a few people can safely change.
Why this is hard
Everything tried so far keeps you tied to the old system.
The difficulty was never writing Java. It's separating what your business does from the platform it happens to run on, then proving the result still matches.
The usual approaches
- –Move the monolith to new hardware, change nothing underneath
- –Translate syntax into "Java-flavoured COBOL" no one wants to maintain
- –Work file by file, never seeing the whole system
- –Leave the business logic entangled with terminals, jobs, and platform quirks
- –Depend on long consulting programs whose incentives are tied to billable hours
What decoupling-first changes
- ✓One complete model of the entire system, not isolated files
- ✓A clean description of the business, free of any platform specifics
- ✓Idiomatic Java built from meaning, decoupled from the legacy mainframe
- ✓Proof the new system matches the old — before you depend on it
The approach
Four moves, one source of truth.
Everything downstream is generated from a single, complete understanding of your system.
Understand
We build a universal system model: a complete, structured view of your whole mainframe, with all the business logic extracted and made explicit.
Transform
From the model we generate real, idiomatic Java microservices that your existing developers can maintain from day one.
Verify
Every component is checked to behave exactly like the original, with a traceable record from source to target.
Migrate
A gradual, reversible cutover keeps your mainframe authoritative until the new system has earned your trust.
What sets us apart
The result carries no trace of the mainframe.
Other approaches read the old code and carry its baggage forward. We extract all of your business logic into one universal system model: a clean description of what the business does, with no terminals, no job control, and no platform specifics. That's what makes the move real, not cosmetic.
- ✓Truly decoupled. A platform-free picture of the business, not the old system in disguise.
- ✓Whole-system, not file-by-file. Every program, data flow, and dependency in one connected model.
- ✓Deterministic, AI enhanced and reproducible. A deterministic, precisely controlled process, enhanced by an advanced AI framework you can re-run and inspect.
Why it matters
Six things that make our approach work for your business.
Fully decoupled from the mainframe
The recovered business picture carries no trace of where it came from. No terminals, no job control, no platform specifics. Just a clean description of what the business does, free of the old technology.
Nothing leaves your environment
The whole pipeline, including the AI, can run on your own controlled hardware. Your source code never crosses a network boundary.
Audit-ready for regulated teams
Every decision is recorded in a sealed trail, with the traceability and repeatability regulated teams need to review it.
Deterministic, AI-enabled pipeline
Mechanical steps do the precise work first. An optimised, advanced AI framework is used only where judgement is needed, then checked against the evidence.
A maintainable starting point
The generated code is a clean, modern foundation. It is easy to read, extend with new features, and maintain with the same tools that created it.
Every line is accounted for
Reviewers can move from a business rule to the original source, the generated code, and the audit evidence in one place.
The destination
From mainframe dependency to business agility.
The goal is not just a migrated codebase. It is a new operating position where the rules that run the business are portable, documented, testable, and owned by your teams.
Logic locked in legacy technology
Critical rules are embedded in programs, screens, jobs, files, and platform behavior.
Change waits on scarce expertise
New products, integrations, and regulatory updates move at the speed of the mainframe queue.
Modernization starts with long discovery
Large programs spend months turning institutional knowledge into documents before reusable system evidence exists.
Business logic as a portable asset
A complete platform-free model becomes the source for code, documentation, tests, and audit evidence.
Change at product speed
Teams can evolve services with familiar Java tooling instead of routing every change through the legacy stack.
Evidence built into delivery
Traceability is created as part of the migration, so governance and engineering review the same facts.
Built for enterprise modernization
One shared basis for action across the organization.
Mainframe modernization touches architecture, engineering, risk, finance, and business operations. DeepMigrate gives each team the evidence they need to move with confidence.
Launch change without waiting on the mainframe
Products, integrations, pricing changes, and regulatory updates can move at business speed instead of being constrained by legacy release cycles.
Remove the drag on strategic execution
When legacy systems set the pace, strategy slows down. DeepMigrate turns trapped business logic into a modern foundation leadership can build on.
Strategic control without a risky rewrite
Move toward modern architecture while keeping the old system authoritative until the new one has earned trust.
Code teams can actually maintain
Generated Java is built from recovered meaning, not a direct translation of legacy file shapes.
A complete model, not isolated files
Dependencies, flows, rules, and data relationships become visible in one connected system view.
Audit evidence from the start
Every decision can be traced from source to generated output, with repeatable evidence for review.
Lower dependency on legacy cost structures
The economics shift away from scarce mainframe capacity and open-ended manual discovery.
Reduce operational dependency on scarce knowledge
Critical processes become easier to understand, document, change, and support across teams instead of relying on a shrinking pool of specialists.
Proof, not promises
Proof you can take into production.
Every step leaves evidence, so modernization becomes something you can verify, govern, and rely on.
Verified equivalence
Each migrated component is shown to behave exactly like the original.
End-to-end traceability
Follow any field or rule from source to target and prove nothing was lost.
Compliance by design
One dataset answers many regulators at once, generated as you go.
Start with a walkthrough
See how DeepMigrate would approach your system.
In 20 minutes, we can walk through the migration model, show what the output looks like, and discuss where your own mainframe estate may be easiest to start.