Connect your legacy systems to modern platforms without replacing what already works.
Expert legacy system integration services that wrap your existing enterprise resource planning, warehouse, or custom-built systems in a modern integration layer, so new platforms connect cleanly while your team keeps using the tools they know.
integration projects delivered · connecting legacy enterprise systems to modern platforms
Hero · Legacy enterprise system connected to modern cloud platforms via integration layer
Operations manager reviewing legacy system integration dashboard · side angle, natural office light · 1200 × 630
Your legacy system is not the problem. The gap between it and everything else is.
Legacy system integration is not about replacing your existing platform. It is about building the connection layer that lets your older systems participate in your modern operations, so your team stops re-entering data across systems that should already talk to each other.
What isolated legacy systems cost your team every day
Manual data re-entry between your legacy platform and every modern tool your business uses
Someone exports a file, reformats it, and imports it into the next system. Every single day.
Data that is always slightly out of date because syncs run once a day or once a week
Decisions get made on yesterday's numbers. Inventory shows stock that has already shipped.
Modern platforms your team wants to adopt cannot connect to the legacy system at all
Business intelligence dashboards, ecommerce platforms, and customer relationship management tools are blocked by the legacy system's isolation.
Replacing the legacy system entirely would take years and cost more than the business can absorb
A rip-and-replace project carries enormous risk. Legacy system integration gives you a working middle path.
Before legacy system integration · disconnected stack
Result: 2 to 4 hours of daily manual work · stale data across every modern tool
See what your legacy system isolation is costing your team every year
Adjust the inputs below to match your current environment. The calculator estimates the annual cost of keeping your legacy system isolated versus building a custom integration layer that eliminates manual effort.
Your estimated annual cost of isolation
Total estimated annual cost of isolation
$71,400
Legacy system integration typically pays back within 6 to 14 months
After custom legacy system integration
Manual transfers eliminated · real-time sync across all connected systems · errors caught before they cascade
Six things a legacy system integration layer gives your business that a replacement project cannot
Legacy system integration consulting is not about making do with an old system. It is about unlocking the data inside that system and connecting it to every modern tool your team is trying to use, without the risk and cost of a full replacement.
Your legacy system stays. Your modern stack connects to it cleanly.
No rip-and-replace. No retraining your team on a new platform. The legacy system integration layer wraps what you have and extends it outward to every modern system you are adding.
Real-time or near-real-time data flow instead of scheduled batch exports
Custom legacy system integration replaces overnight file exports with event-driven or scheduled near-real-time sync so downstream systems see current data without manual intervention.
Integration that works even when the legacy system has no application programming interface
Direct database connections, file-based exchange, and custom connector development let us reach legacy systems that have no modern application programming interface endpoint at all.
Bidirectional data flows so both systems stay accurate simultaneously
Custom legacy system integration solutions move data in both directions. Orders placed in Shopify create records in the legacy system. Updates in the legacy system write back to the storefront.
Documented runbooks and error handling at handoff so your team can maintain the integration
Every legacy system integration we build ships with runbooks covering connection details, data mapping logic, error thresholds, and the monitoring configuration your team needs to operate it independently.
A migration path forward if and when the legacy system is eventually replaced
A well-designed legacy system integration layer separates your data model from the legacy system itself, making a future migration significantly less disruptive when your team is ready.
From fragmented legacy systems to unified operations managing over 8,000 inventory items
Pima Controls is a distributor of industrial automation and electrical products operating in a high-volume, inventory-intensive environment. The existing enterprise resource planning system was creating production delays, inflating raw material costs, and reducing customer satisfaction through poor inventory tracking, duplicate data entry, and heavy reliance on manual processes.
Legacy system pain before integration
- Production delays caused by poor visibility across the existing legacy enterprise resource planning system
- Duplicate data entry and manual processes limiting visibility across operations and slowing response times
- Inflated raw material costs from inaccurate inventory tracking across the fragmented legacy system
Inventory items managed with full visibility after legacy integration
Duplicate data entry tasks remaining after the integration went live
Mobile data capture enabled for production teams across all facilities
Case Study · Unified system view after legacy enterprise resource planning and customer relationship management integration
Unified operations dashboard after legacy enterprise resource planning and customer relationship management integration · 960 × 540
Microsoft Dynamics NAV was implemented to unify core business modules, with a customized customer relationship management system integrated alongside. Advanced inventory management, Power Business Intelligence dashboards, and mobile data capture were added, resulting in reduced production delays, lower raw material costs, and significantly higher customer satisfaction across Pima Controls' industrial distribution operation.
Legacy system integration is not a template project. Every system is different, and every connection requires custom logic.
We start by auditing what your legacy system can expose, what data formats it uses, and what modern systems need to consume. The integration design comes after that audit, not before it.
Legacy system integration approaches we use
- Direct database-level integration using read/write connections to the legacy system's underlying data store
- File-based exchange integration where the legacy system exports data and the integration layer picks it up on schedule or on trigger
- Custom connector development for legacy systems that expose a proprietary connection protocol or older web service
- Middleware orchestration layers that normalize legacy data formats before routing to modern systems
Legacy systems we commonly integrate from
- Microsoft Dynamics NAV and Microsoft Great Plains on-premise enterprise resource planning environments
- Sage 50, Sage 100, and older accounting platforms with no modern application programming interface
- Custom-built legacy warehouse management and inventory systems specific to one business
- On-premise manufacturing execution systems and older production tracking platforms requiring data extraction
A legacy system integration provider that audits before it proposes
Most partners scope a legacy system integration project without first understanding what the system can actually expose. We audit the system's data access methods, formats, and constraints before recommending an integration approach. That audit shapes the scope, the timeline, and the architecture.
Differentiation · Legacy system integration audit, connection layer planning
Engineers auditing legacy system server and database schema before integration planning · overhead angle, natural light · 1200 × 500
What most legacy system integration projects miss
- Proposing an application programming interface-first architecture before confirming the legacy system has any application programming interface at all
- Ignoring the legacy system's data quality issues, which propagate into every modern system the integration touches
- Building a one-directional data pipe that makes the legacy system a read-only source when the business needs bidirectional sync
- No documentation of the integration layer, creating a permanent dependency on the partner who built it
What every Redefine legacy integration delivers
- A pre-scoping audit of the legacy system's data access methods, formats, and constraints before any architecture is proposed
- Data validation and cleaning built into the integration layer so legacy data quality issues do not propagate downstream
- Bidirectional sync architecture designed from the start so the legacy system receives updates, not just sends them
- Full documentation, runbooks, and monitoring configuration at handoff so your team owns the integration without depending on us
Questions about legacy system integration services
Legacy system integration is the process of connecting an older enterprise system, such as a legacy enterprise resource planning platform, an on-premise database, or a custom-built application, to modern cloud platforms, ecommerce systems, or business intelligence tools through a bridge layer. Instead of replacing the legacy system, which is expensive and risky, legacy system integration adds an application programming interface or middleware layer that allows data to flow between the old system and the new systems your business is adding.
No. Legacy system integration is specifically designed to avoid a rip-and-replace scenario. The goal is to wrap your existing system in a modern integration layer, typically using application programming interface middleware, event-driven connectors, or file-based exchange depending on what the legacy system supports. Your team keeps using the system they know while modern platforms connect to it cleanly. Replacement becomes optional rather than mandatory.
Our legacy system integration consulting covers older enterprise resource planning platforms such as Microsoft Dynamics NAV, Microsoft Great Plains, Sage 50, and Sage 100, as well as on-premise databases, custom-built systems with no existing application programming interface, legacy inventory and warehouse management systems, and older manufacturing execution systems. If the system can expose data through a database connection, a file export, or any application programming interface endpoint, integration is possible.
A focused legacy system integration connecting one legacy platform to one or two modern systems typically goes live in five to eight weeks. More complex legacy system integration solutions involving custom middleware, multiple systems, or real-time bidirectional data flows run ten to sixteen weeks. We publish a line-by-line delivery timeline before work begins so your teams can plan around each integration milestone.
Most legacy systems can still be integrated even without a modern application programming interface. Common approaches include direct database-level connections where we query or write to the legacy system's database, scheduled file-based exchange where the legacy system exports data and the integration layer picks it up, screen scraping middleware for systems with no other access method, and custom connector development for legacy systems that expose a proprietary connection protocol. We assess the available access methods during scoping and recommend the approach with the best balance of reliability and maintenance cost.
A quick fit check before you reach out
A strong fit if your team
- Has an older enterprise resource planning, warehouse, or custom system that cannot connect to modern platforms without manual data transfers
- Needs the legacy system to keep running while modern tools are added around it, with data flowing automatically between them
- Wants a custom legacy system integration solution built around the specific data access methods your system supports
- Needs documented runbooks and integration ownership at handoff so no long-term vendor dependency is created
Not a fit if your team
- Has already decided to replace the legacy system and needs a migration project rather than an integration layer
- Has a legacy system with no database access, no file export capability, and no documentation of its internal structure
- Needs go-live in under three weeks with a system that has never been audited for its integration capabilities
- Has a completely closed proprietary system where the vendor prohibits any third-party data access by contract
Not sure which applies? Tell us about your system and we will be direct with you. Describe it below.
Tell us about your legacy system. We'll scope the integration layer.
Scoped before work starts, line-by-line pricing, no commitment to receive a proposal.
Response in 48 hours
A legacy integration specialist reviews every brief
Proposal in 3 days
Line-by-line scope with integration architecture plan
200+ integrations delivered
Including legacy enterprise resource planning, warehouse, and custom systems
Full code ownership
Your integration layer, your runbooks, no dependency
Brief received
We'll review your legacy system details and send a scoped integration proposal within 3 business days.