Modernization

Modern front ends for your 3270 applications

We build web, mobile and desktop interfaces on top of the IBM 3270 mainframe systems you already run. Your COBOL, CICS and IMS applications stay exactly as they are.

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CICS · TN3270E · TLS 1.3 · MODEL 4 SESSION A ACCOUNT INQUIRY LU GSA00412 ──────────────────────────────────────────── ACCT STATUS REGION UPDATED 100231 ACTIVE CENTRAL 09:30 100245 ACTIVE WEST 09:28 100260 HOLD WEST 09:12 ──────────────────────────────────────────── Command ===> █ F1=Help F3=Exit F7=Bkwd F8=Fwd

How it works

A new interface, the same proven backend

Headless 3270 engine

Our engine signs on to your host over TN3270E with TLS and drives the existing screens, exactly as a user would.

Each screen becomes an API

Fields on each screen are mapped to clean, typed API calls, with host validation and error messages carried through.

A modern UI on top

We design and build the web, iPhone, iPad or desktop app your staff use, built around their workflow rather than the screen flow.

Why this approach

Modernize what people see, not what already works

Rewriting a core system is slow and risky. Keeping the backend means no data migration and no change to your business rules.

No backend rewrite. Host programs, data and security stay unchanged.
Your existing security. Access still runs through RACF, ACF2 or Top Secret sign-on.
Incremental. Modernize one workflow at a time, alongside existing terminals.
Built by 3270 specialists. The same team that builds Greenscreen 3270.

Starting point

A fixed-price pilot of one workflow

We pick one high-value workflow with you, such as an account inquiry or an order entry, and deliver it as a working modern app against your host. You get a fixed scope and price agreed up front, and a clear view of what a wider rollout involves.

Have a 3270 workflow in mind?

Tell us about your host environment and the workflow you’d start with.

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