What we deliver

Business impact, fast.

Concrete jobs your team can do this week, on a system no one fully remembers.

Place any change with confidence

Scope a feature and see exactly where it lands across programs, data, and flows, even in a system you have never seen before.

Resolve incidents in minutes

Trace root cause precisely by evidence, not tribal memory, and fix it fast without waiting on the one person who remembers.

Optimize flows, cut run-cost

Surface redundant and dead logic in existing flows, and streamline what you actually run.

Move only what is worth moving

When a specific workflow genuinely belongs elsewhere, evolve it fit-for-purpose, and only after the change is proven low-risk.

Our approach

Everyone's selling you a way off the mainframe.
We deliver business impact tomorrow.

Understand your core first, then choose the right path.

The market offers you three boxes and pressures you to pick one blind - every option acts on a system nobody fully understands.

The category trap
Rewrite it
A full rip-and-replace
The catch

A multi-year, big-bang bet: expensive, high-risk, and rarely a better outcome for your customers.

Replatform it
Lift the runtime somewhere new
The catch

You move the logic, and all of its risk, without ever understanding it first.

Just ask AI
Point a generic copilot at it
The catch

Ungrounded answers: uncited, inventing dependencies that don't exist, and your code leaves the perimeter.

Tweezr comes first

Tweezr is the step before any of those choices. We make your core readable, queryable, and trusted, so you decide from evidence, not from a vendor's roadmap. And most of the time, the smartest, lowest-risk move is to evolve it right where it is.

Technology coverage

The mainframe - and everything legacy around it.

From COBOL to modern Java - one platform that maps your full estate, end to end.

Legacy platforms

Mainframe · z/OS

The mainframe, fully mapped

IBM z-Series - the heart of most banking back-offices. Full coverage across TP monitors, batch languages, data and screen layers. Every program, copybook, and queue resolved into one navigable graph.

TP / online monitors

CICSIMS-TM

Batch languages

COBOLPL/IAssemblerJCL

Data

VSAMDB2 z/OSIMS-DBSequential files

Schema / screens

CopybookDCLGENBMSMFS

Example lineage trace

From a CICS green screen, follow a payment through a COBOL transaction, into DB2 z/OS, and out via MQ to a Java microservice - every hop with attested provenance.

Generic LLMs guess at COBOL because they've never seen the calling graph. Tweezr reads it.

Where the legacy lands →

Cross-platform

Don't see your stack?Tell us what you run →
Where we fit

The understanding layer the rest of your stack is missing.

Swipe to see the full chart

Generic AI copilotsStatic code analysisConsultanciesTweezr
Deterministic, cited & re-runnable answers○◐○●
Explainable impact analysis ("what breaks if…")◐◐◐●
Business rules & flows as editable models○◐○●
Built to evolve the core, in place◐◐◐●
Runs on-prem, code never leaves◐●◐●
Productized & self-serve, not services-heavy●◐○●

More grounded than AI-only, more scalable than consulting, more change-ready than static discovery. ● full · ◐ partial · ○ none

Runs on IBM Z

Available and supported on IBM LinuxONE and Linux on IBM Z

The full platform runs natively on the s390x architecture - co-located with the core it maps, inside your perimeter, with no outbound calls to external services.

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IBM Technology Partner

The IBM Technology Partner mark is a trademark of International Business Machines Corporation, registered in many jurisdictions worldwide. IBM, IBM Z, IBM LinuxONE, and LinuxONE are trademarks or registered trademarks of International Business Machines Corporation.