Engineering & Platforms
Legacy System Integration
Connecting legacy systems that lack modern APIs, such as old ERPs, mainframes, AS/400 applications and in-house databases, to newer applications using database access, change data capture, messaging, file exchange or automation.
Capability overview
What legacy system integration involves
Legacy systems often hold the most valuable data in the organisation, yet they were built before APIs were common. Replacing them may be years away, while new mobile apps, portals and analytics platforms need their data now. Legacy system integration builds safe bridges without destabilising systems that still run core operations.
Techniques depend on what the system allows: read-only database views, change data capture with tools such as Debezium or Oracle GoldenGate, message queues, flat file exports, vendor connectors for mainframe and IBM i, and as a last resort robotic process automation through the user interface. An API facade then gives modern applications a clean interface.
What is included
Integration techniques
API facades
Modern REST APIs placed in front of legacy functions so new applications never depend on legacy internals.
Change data capture
Database changes streamed to other systems in near real time without modifying legacy application code.
Mainframe and IBM i connectivity
Access to CICS transactions, DB2 data and RPG programs through supported connectors and messaging.
File-based integration
Scheduled exports and imports with validation, reconciliation and alerting when files are late or malformed.
Interface automation
Robotic process automation for systems offering no other access, with monitoring for screen changes.
How we work
How we deliver legacy system integration
Legacy access assessment
Available interfaces, database structures, load limits and support constraints reviewed with system owners.
Technique selection
Least invasive technique chosen that meets latency, volume and reliability needs.
Facade and adapter build
Adapters and API facades developed with caching or throttling to protect the legacy system.
Load and impact testing
Integration tested under expected volumes to confirm the legacy system's performance is unaffected.
Operational handover
Monitoring and runbooks delivered, with legacy support staff briefed on the new dependencies.
Related capabilities
Related capabilities in Enterprise Platforms & Integration
Enterprise Data Integration
Keeping operational master and reference data, such as customers, products, suppliers, locations and employees, consistent across ERP, CRM, e-commerce and other business systems through synchronisation and matching rules.
Enterprise Content Management
Document and records management for the organisation, covering capture, classification, version control, approvals, retention, search, e-signatures and secure sharing across SharePoint, M-Files, OpenText or Alfresco.
Custom Enterprise Platforms
Internal platforms that provide shared foundations, such as identity, workflow, notifications, documents, reporting and integration, on which several business applications are built faster and more consistently.
Enterprise Application Integration
An integration architecture for the whole organisation, deciding how ERP, CRM, HR, finance, operational and SaaS systems exchange data, which platform carries it, and how interfaces are governed and monitored.
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Questions & answers
Questions about Legacy System Integration
Cannot find what you need? Our team responds to technical and commercial questions within one business day.
Ask a questionRead-only access through views or replicas is usually safe when load is controlled. Writing directly to legacy tables bypasses business rules and is avoided unless the vendor supports it.
Yes. An API facade decouples new applications from the legacy system, so when replacement happens only the facade's back end changes, not every consumer.
When no API, database or file option exists and volumes are moderate. It is more fragile, so screen changes are monitored and it is treated as a temporary bridge.
After an access assessment, integrations are quoted per interface based on technique, volume and testing effort.
Next step
Discuss legacy system integration with Acmez
Share what you need to change, build, integrate or support. We will map the practical next step.