Platform

Connect legacy systems to the speed of modern retail

Retailers run on systems built for a different era mainframes, and IBM i systems that hold inventory truth, pricing logic, and order history. The challenge is not replacing them. It is getting real-time data and services out of them before your competitors do.

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What's holding retail back

Retail moves fast — but the systems that hold inventory, pricing, order, and customer data often do not. The pressure to deliver real-time omnichannel experiences, handle peak trading periods, and feed AI-driven personalization is real. The bottleneck is usually not ambition. It is the gap between what the legacy system holds and how quickly modern services can access it.

Real-time omnichannel inventory visibility

Expose inventory data from legacy ERP and IBM i systems as real-time APIs — so e-commerce, mobile, in-store, and fulfilment channels all work from a single, live source of truth. Eliminate overselling and buffer stock caused by batch-updated inventory feeds.

Seasonal scalability and peak trading performance (Black Friday, Cyber Monday)

Legacy systems running batch-based inventory and order processes cannot support sub-second response times during peak trading. OpenLegacy generates cloud-native services from legacy back-ends that can scale elastically with demand — without requiring changes to the core system.

Customer loyalty and personalization powered by AI

Loyalty programs and AI personalization engines need real-time access to purchase history, customer profiles, and inventory data locked in legacy systems. OpenLegacy provides that connection with lower latency than traditional middleware, enabling AI-driven recommendations and real-time loyalty status.

Supply chain and logistics visibility

Inventory and logistics data siloed in legacy ERPs cannot support real-time supply chain decisions. OpenLegacy connects supply chain platforms and analytics tools directly to legacy data sources — providing the real-time visibility needed to respond to demand shifts and reduce out-of-stock events.

ERP and SAP integration without custom middleware

Connecting modern cloud applications to existing ERP systems through custom middleware is slow, fragile, and expensive to maintain. OpenLegacy generates standards-based APIs directly from ERP and SAP data structures — enabling faster integration without bespoke connector development or middleware overhead.

Point of sale modernization and cloud transition

Legacy POS systems that depend on batch synchronization cannot support modern in-store experiences. OpenLegacy enables a phased POS modernization approach — exposing POS data and functions as APIs and progressively shifting workloads to cloud-native services without a disruptive cutover.

Connect faster. Scale further. Sell more.

10x

Faster Time-To-Market

Deliver new digital commerce capabilities faster by connecting directly to legacy inventory, ERP, and order systems — without changing the systems underneath.

60%

Cost Reduction

Reduce integration development effort through automation and direct connectivity — eliminating the custom middleware builds that slow every digital initiative.

Zero

Big Bang Rewrites

Safely bridge legacy ERP speed and real-time digital commerce needs. Legacy and cloud run in parallel — workloads shift in controlled phases at your pace.

Where OpenLegacy delivers value in retail

These are the retail modernization initiatives where legacy systems create the most friction — and where OpenLegacy removes it without disrupting the operations that keep the business running.

External + Data Layer Decoupling

Real-Time Omnichannel Inventory Management

E-commerce, mobile, in-store, and third-party fulfilment channels all need to work from the same, live inventory position. But inventory truth lives in legacy ERP and IBM i systems that were built for batch processing — not sub-second API responses. OpenLegacy generates real-time APIs directly from these legacy inventory systems, providing all channels with a single, consistent source of stock truth. Overselling risk is eliminated, buffer stock is reduced, and fulfilment accuracy improves across every channel.

Real-TimeInventory Accuracy

No OversellingAcross Channels

External Decoupling

Seasonal Scalability & Peak Trading Performance

Black Friday, Cyber Monday, and other peak trading events expose the limits of legacy batch systems. E-commerce platforms need sub-second response times for availability checks and order placement — and the systems that hold that data need to scale elastically with demand. OpenLegacy generates cloud-native services from legacy inventory and order back-ends that can be deployed on cloud infrastructure and scaled independently of the core system, without requiring the core to be changed or re-architected.

Sub-SecondAPI Response

ElasticPeak Scaling

Data Layer Decoupling

Customer Loyalty & AI Personalization

Loyalty programs and AI recommendation engines need real-time access to purchase history, customer profiles, and live inventory data. This data is often stored in legacy systems and is only accessible via batch exports or slow middleware integrations. OpenLegacy connects AI and personalization platforms directly to legacy data sources with the low latency that real-time recommendations require — enabling loyalty point calculations, personalized offers, and next-best-action prompts to respond to what the customer is doing now, not what they did yesterday.

Real-TimeCustomer Data

ContextualPersonalized Offers

External + Data Layer Decoupling

Supply Chain Visibility & ERP Integration

Supply chain visibility platforms, demand forecasting tools, and logistics systems all need consistent, real-time access to inventory and order data held in legacy ERP and IBM i environments. Custom connector builds are slow, fragile, and expensive to maintain. OpenLegacy generates standards-based APIs directly from ERP and SAP data structures — including IBM i and mainframe-hosted instances — enabling supply chain platforms to access the data they need without bespoke integration work and without changing the core ERP.

API AccessERP & SAP Data

FasterPartner Onboarding

Internal + External Decoupling

Point of Sale Modernization & Cloud Transition

Legacy POS systems that depend on nightly batch synchronization to the back office cannot support modern in-store experiences — mobile checkout, clienteling tools, real-time loyalty redemption, or unified cart across channels. OpenLegacy enables a phased POS modernization approach: exposing POS data and functions as APIs first, progressively shifting in-store workloads to cloud-native services, and enabling digital twin patterns where IoT and in-store sensors can reference real-time legacy inventory data — all without a disruptive POS replacement program.

PhasedPOS Modernization

No DisruptionCloud Transition

How OpenLegacy works with your core systems

Your ERP, IBM i, and legacy inventory systems do not need to be replaced to power modern retail experiences. OpenLegacy connects directly to these systems and generates cloud-ready APIs and services from what already exists. Digital and legacy run in parallel - you choose the pace.

Legacy and Cloud run in parallel. Workloads shift in waves. The core stays stable throughout.

The OpenLegacy platform drives every phase

Reverse Engineering

Securely connect to IBM i, ERP, mainframe, or legacy system. Visualize dependencies, data structures, and integration points to identify the safest decoupling opportunities before any changes are made.

Smart Integration

Map your modernization plan. AI-powered automation identifies the APIs and services needed to support the target retail architecture and builds the service blueprint — without manual reverse-engineering or specialist legacy skills.

Forward Engineering

Auto-generate the services identified in the plan. Deploy to cloud, on-premises, or hybrid environments. Iterate continuously — each wave builds on the last and delivers business value without waiting for a full program to complete.

Trusted by leading retailers and consumer operations

Retailers and consumer-facing enterprises across Europe and the Americas use OpenLegacy to connect their legacy systems to modern digital platforms — delivering real-time data, faster catalog updates, and seamless supplier integration without replacing the core systems their operations depend on.

Monoprix

Fashion catalog updates in near real time, instead of the next day

Challenge

New collections had to reach the online catalog faster, and the pandemic made that digital shelf more important. Batch jobs, green screens, and DB2 updates meant a new or changed item waited a full day, and fixing a bad update could take days.

Solution

OpenLegacy moved the catalog path from batch to mainframe CICS and exposed those transactions as APIs and microservices, with no extra integration layer. Green screens, database access, and batch can sit in the same API. After a 45-day ramp-up, Monoprix ran the project itself.

Results

Catalog updates: near real time, instead of the next day
Ramp-up: 45 days from batch to realtime
Ownership: the team took the platform over after that ramp-up

"Before OpenLegacy, the data was not available until the next day, with a batch integration approach. The OpenLegacy solution opened up our mainframe even more."

Emmanuel Lecomte, Lead Architect, Monoprix

Delek Motors

A Microsoft Dynamics view of the customer, fed by the IBM i

Challenge

After taking on the BMW franchise, Delek built a call center and a CRM for 120 people across headquarters, logistics, and 12 dealerships. Quotes, orders, logistics, and customer care all lived on the IBM i, and the CRM was blind without them.

Solution

With Elad Systems, OpenLegacy brought more than 120 IBM i screens into Microsoft Dynamics in three weeks. Business logic moved into the CRM workflow with security and permissions unchanged, and with no change to the underlying system.

Results

Salesforce productivity: 12% to 25% higher, about one to two hours a day
Screens integrated: more than 120 in 3 weeks
Whole project: launched in 3 months, on time and under budget

"OpenLegacy made the integration between the IBM i applications and the CRM fast and painless."

Ruth Hirsch, Deputy CIO, Delek Motors

Built to work with your cloud and technology partners

OpenLegacy integrates into modern cloud environments and works alongside the platforms retailers already rely on. Whether you are connecting a cloud-native e-commerce platform to a legacy IBM i inventory system, integrating AI personalization with ERP data, or bridging IoT in-store sensors to back-office stock records - OpenLegacy fits into your architecture and delivery model without replacing the systems you depend on.

It complements modernization programs led by cloud providers and systems integrators, fitting alongside existing ERP migration and cloud adoption programs rather than competing with them.

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Go Deeper

Powering Seamless Supplier Data Modernization

See how OpenLegacy generates real-time inventory APIs from legacy ERP and IBM i systems — enabling a 200% revenue growth by optimizing control over essential information, leading to improved decision-making and market responsiveness.

Read the Brief

Three Patterns for Retail Modernization Without Risk

External, Internal, and Data Layer decoupling — three proven approaches to connecting legacy ERP, IBM i, and inventory systems to modern cloud environments. See how each pattern applies in a retail and commerce context.

Explore More

How Enterprises Connect Legacy Systems to Real-Time Commerce

See how leading organizations have used OpenLegacy to bridge legacy back-office systems with modern digital channels — delivering real-time inventory, faster integrations, and scalable cloud adoption without a core system replacement.

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Ready to see It in your environment?

Our team will show you how OpenLegacy connects to your specific systems — mainframe, IBM i, or legacy application — and generates an API in a live session. No commitment. No specialist knowledge required on your end. Just your system details and 30 minutes.