Legacy modernization — Use case

Wrap, expose, and retire 20-year-old SOAP, mainframe, and database backends through one gateway — without a rip-and-replace and without rewriting consumers.

Executives · Modernization · For executives

Modernize what's behind. Don't break what's in front.

Apinizer wraps every legacy backend — SOAP, mainframe, stored procedure, FTP, file drop — and exposes a clean REST or AI-callable surface. Modernize on your timetable, not on a vendor's clock.

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The problem

The problem

Rip-and-replace is a fantasy. Coexistence is the only realistic path.

The core banking system from 2003 still books transactions. The claim engine in Cobol still pays. The supplier integration over SOAP still ships parts. None of them are going away this fiscal year — but the consumers in front of them increasingly expect REST, OpenAPI, and AI access. Apinizer's job is to make the old behave like the new, without forklifting the old.

Capabilities

Protocol translation

SOAP, gRPC, GraphQL, WebSocket — translated to a clean REST or AI-callable surface on the gateway. Consumers see modern; backends see what they always saw.

DB-to-API and Script-to-API

Stored procedures and SQL queries become endpoints. Groovy or JavaScript scripts ship as managed APIs. The mainframe gets a URL.

Connector library

Database, Kafka, RabbitMQ, FTP, IBM MQ, file systems, and more — drag-and-drop task flows pull legacy data without bespoke integration code.

Strangler-pattern friendly

Route old traffic to the legacy backend; route new traffic to the modern service. Cut over endpoint-by-endpoint until the legacy can be retired safely.

Modern controls on top

Auth, rate limits, transforms, audit, observability — applied at the gateway. Legacy backends get the controls they never had a chance to grow.

AI on top of legacy

LLMs and agents can call the modernized surface — no need to teach a model how to speak Cobol or assemble a SOAP envelope.

Real-world examples

Banking

Scenario: Istanbul retail bank retires 92 SOAP endpoints across two years

Outcome: Each SOAP service wrapped at the gateway as REST. Consumers migrate at their own pace; deprecation headers trigger the cutover on schedule.

Metric: 92 SOAPs retired

Insurance

Scenario: Düsseldorf insurer exposes a 1990s policy engine as OpenAPI

Outcome: DB-to-API turns 14 stored procedures into endpoints. The claims chatbot calls REST; the engine doesn't notice anything changed.

Public sector

Scenario: Stockholm agency wraps a mainframe with an OpenAPI surface

Outcome: Connector library bridges IBM MQ; Script-to-API handles transformation. New citizen apps consume REST; the mainframe keeps its job.

Energy

Scenario: Warsaw utility brings SCADA into a modern integration plane

Outcome: Operations data exposed as governed REST. Audit and access controls finally cover the part of the estate auditors used to skip.

Manufacturing

Scenario: Turin OEM bridges MES file drops to a modern API

Outcome: Connector watches FTP, lifts each file, exposes a REST endpoint per record. The MES vendor never touched a line; the partners get a real API.

Telecom

Scenario: Madrid carrier strangles a 12-year-old billing API

Outcome: Old traffic to the legacy host; new traffic to the new service. The gateway routes by consumer; cutover finished without an outage window.

Metric: 0 outage windows

Government

Scenario: Baku ministry turns 40 legacy stored procedures into a portal API

Outcome: DB-to-API exposes each procedure. The developer portal lists them with OpenAPI specs; partners onboard themselves in days.

Healthcare

Scenario: Prague hospital wraps an HL7 v2 integration as REST + FHIR

Outcome: Apinizer translates HL7 messaging into REST. Modern apps speak REST/FHIR; the hospital information system never changes.

Recommended modules

API Gateway — Multi-protocol runtime that fronts every legacy backend with a modern surface.
API Creator — DB-to-API, Mock API, Script-to-API — every shortcut for turning legacy into managed endpoints.
API Integrator — Drag-and-drop task flows over 15+ connectors — Kafka, MQ, FTP, file systems, databases.
AI Gateway — Agents and LLMs can call the modernized surface — no Cobol, no SOAP envelopes.

Resources

Legacy modernization patterns — Strangler, wrap-and-replace, parallel-run — the playbooks Apinizer is built to support.
API Creator — DB-to-API, Mock API, Script-to-API in one place — the fastest path from legacy to endpoint.
API Integrator — Drag-and-drop task flows over 15+ enterprise connectors.
Banking customer story — How Aktif Bank-style institutions retired 90+ legacy endpoints without a rewrite.
API monetization — What a modernized estate gives back to the P&L once partners can self-serve.
Architecture overview — Where the gateway, Creator, and Integrator sit in the topology.

Unified API & AI platform — For executives
API monetization — For executives
DB-2-API — For developers
Connector library (15+) — For developers

Next step

Coexistence beats rip-and-replace

Make the old behave like the new.

A 30-minute walkthrough — wrap, expose, route, retire — on a Kubernetes of your choice.

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