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Modernize

IBM mainframe transition and data migration

We help companies move workloads and data off IBM mainframes, or modernize them in place, in stages and without stopping the business.

Discuss your project
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      * migrate without stopping the business       PERFORM MIGRATE-WAVE UNTIL ALL-WAVES-DONE.           IF RECORDS-MATCH               PERFORM CUTOVER           END-IF.

What we take on

  • Assessment & inventory

    Map applications, batch jobs, data stores, interfaces and dependencies.

  • Strategy & roadmap

    Choose per workload: rehost, refactor, rewrite or retire.

  • Code transition

    COBOL and PL/I logic moved to Java, .NET or cloud services, with behavior kept.

  • Data migration

    DB2, IMS and VSAM data moved to modern databases with full reconciliation.

  • Batch & integration

    JCL batch replaced with schedulers and APIs, interfaces kept working.

  • Parallel run & cutover

    Old and new systems run side by side until results match.

Technologies

  • z/OS
  • COBOL
  • PL/I
  • JCL
  • CICS
  • DB2
  • IMS
  • VSAM
  • Java
  • PostgreSQL
  • Oracle
  • AWS
  • Azure
  • Kafka

How a transition runs

  1. Discovery

    Inventory code, data and jobs, and agree what success means.

  2. Pilot

    Move one workload end to end to prove the approach.

  3. Migrate in waves

    Transition workloads in stages, each with tests and a rollback.

  4. Reconcile data

    Compare record counts, totals and samples between old and new.

  5. Parallel run

    Run both systems and compare outputs before switching.

  6. Cutover & support

    Switch with a rollback plan, then decommission safely.

How we keep it safe

  • No big-bang switch: every step has a rollback.
  • Data reconciled at every stage, not only at the end.
  • Business rules documented as they are extracted from code.
  • Security and audit requirements kept throughout.

Questions about mainframe modernization

Do we have to leave the mainframe completely?

No. Some companies keep core systems on the mainframe and modernize around them with APIs. We help choose per workload.

How do you make sure no data is lost?

Every migration wave includes automated reconciliation of counts, totals and samples, and a parallel run before cutover.

What if nobody knows the old code anymore?

We extract and document the business rules from the code during assessment, before anything is changed.

Planning a mainframe transition?

Tell us what you need, and we will suggest the right team model on a short call.

Talk to us