Our Solution
Reclaim your core. Understand it, own it, evolve it.
One deterministic platform that maps your estate, explains it in business terms, and evolves it in place.
From mainframe COBOL and JCL to the Java and .NET services around them: one deterministic map of your whole legacy estate, cited to the line.
- 3× Best of Show · Finovate 2025 & 2026
- Runs on-prem · your code never leaves
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.
Why Tweezr
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.
- Rewrite itA full rip-and-replace
A multi-year, big-bang bet: expensive, high-risk, and rarely a better outcome for your customers.
- Replatform itLift the runtime somewhere new
You move the logic, and all of its risk, without ever understanding it first.
- Just ask AIPoint a generic copilot at it
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.
How we deliver
AI you can trust, on truth you can prove.
A deterministic system map, built on-prem, then AI grounded in it. Cited, re-runnable, and your code never leaves.
01
Map
We ingest your estate on-premise and build a deterministic map: every program, job, field, dependency, and business rule. No model required, and nothing leaves your perimeter.
02
Understand
We layer business meaning over the map: rules, flows, and decision tables your engineers and your AI can read, traverse, and edit.
03
Answer
Your AI answers grounded in that map, cited to the exact program, paragraph, and field, and re-runnable. No invented dependencies, no confidently-wrong refactors.
- Deterministic & citedEvery answer is re-runnable and audit-ready.
- On-prem by defaultYour code and data never leave the perimeter.
- Decision models, not just mapsBusiness logic you can read, traverse, and edit.
Technology coverage
One map across every platform in the estate.
Mainframe, midrange and heritage platforms, the targets the legacy lands on, and the tooling that runs it all.
See the full coverage matrixLegacy platforms
z/OSIBM i (AS/400)Other heritage platformsThird-party cores
Where the legacy lands
Unix / LinuxContainers & orchestrationModern legacy
Cross-platform
Tooling that runs the estate
Where we fit
The understanding layer the rest of your stack is missing.
More grounded than AI-only, more scalable than consulting, more change-ready than static discovery.
| Capability | Generic AI copilots | Static code analysis | Transformation platforms | Consultancies | Tweezr |
|---|---|---|---|---|---|
| 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 | |||||
| Covers the operational estate (JCL, Endevor, Control-M, SMF) | |||||
| Productized & self-serve, not services-heavy |
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