For the last decade, manufacturing effectiveness has depended on automation, cloud platforms, analytics, and IoT; now AI has been added to the list. Yet despite the investments, many factories still depend on 10-, 15-, or even 25-year-old Manufacturing Execution Systems (MES) and Supervisory Control and Data Acquisition (SCADA) environments. Do they work well? Absolutely. Do they need upgrades to go along with modern protocols? Totally yes.
To enable real-time production visibility and AI-powered features like predictive maintenance and automated quality control, systems must be modernized incrementally, without any disruption. Nobody will simply shut down production, replace everything, migrate the data, and turn the new platform on tomorrow morning.
As a result, the best legacy modernization companies for manufacturing therefore understand the current state of systems and specific manufacturing process needs in addition to niche tech knowledge.
This list compares manufacturing legacy modernization companies operating across that spectrum in 2026. It shows global systems integrators, as well as industrial automation vendors and specialized MES providers. We are ready to guide you through the vendor selection. Let’s start.
TL;DR
Manufacturing legacy modernization companies have to deal with something most enterprise IT vendors never have to. In fact, they touch systems that, in case of disruption, cost real money each minute. That changes almost everything about the modernization process. If you’re short on time, here’s the shortlist:
- Rockwell Automation for deep, vendor-native PLC/DCS/SCADA modernization tooling
- GlobalLogic for large, multi-system shop-floor integration at industrial scale
- Devox Software for teams that want a dedicated delivery partner spanning both legacy modernization and manufacturing software
The rest of this article breaks down vendors across 4 delivery models to actually shortlist one.
What to Take into Account when Modernizing Legacy Industrial Systems: For Vendors and Clients
Since most industrial legacy modernization guidance starts with software architecture, we’d like to highlight the importance of a holistic approach. Regardless of the niche and vendor, as a manufacturer, you are likely to meet the following requirements:
- Production cannot simply stop for IT updates. Beyond architecture, manufacturers need to consider the following while modernizing:
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- how production will continue during migration
- which systems can run simultaneously
- how legacy and modern platforms will exchange data
- what happens if the new environment fails
- how quickly the plant can roll back
- which production line or site should migrate first
- and how the organization will validate that the new system behaves correctly before expanding the rollout
- Consider Brownfield modernization. Most manufacturing modernization programs do not have the luxury of selecting technologies without accommodating decades of existing infrastructure.
- IT/OT integration becomes the architecture. Historically, plant-floor systems were intentionally isolated. Industry 4.0 increasingly requires information to flow across those boundaries.
- Production orders may originate in ERP and move to MES. Machine events may flow from PLCs through SCADA or edge infrastructure into analytics platforms.
That problem remains widespread. 74% of manufacturers face disconnected data despite higher technology investment. In practice, this is the reason why manufacturing legacy modernization companies also need practical experience with OPC UA, MQTT, Modbus, industrial gateways, edge computing, and more.
The Methodology behind the List: Selection Criteria
This list is specifically narrowed to the MES, SCADA, PLC, and ERP modernization efforts that represent the needs of a running plant. For a broader view, see our top legacy modernization companies in the US or top custom software development companies for manufacturing for new-build manufacturing software projects.
This long list of manufacturing legacy modernization companies is based on open sources: review platforms, our own competitive intelligence in legacy modernization deals, and public case studies. We evaluated the candidates in the following dimensions:
- Named manufacturing engagements
- MES/SCADA/PLC-specific platforms (FactoryTalk, PlantPAx, SAP ME, Opcenter, Plex, AVEVA, Ignition) and the protocols that connect them (OPC UA, MQTT)
- Zero-downtime migration mentions
- IT/OT integration capabilities
- Industrial compliance standards (ISA-95, IEC 62443 for OT security, and GxP/FDA validation if any applied)
For this reason, we dropped several well-known modernization brands from earlier drafts of this list, simply because we could not find a verifiable, named manufacturing case.
A note on Devox Software: we’ve included ourselves thanks to our hands-on MES and ERP modernizations and a documented, phased migration methodology. Moreover, we haven’t ranked the companies; every other vendor on this list is a credible partner worth shortlisting independently of us.
Best Legacy Modernization Companies for Manufacturing
You can see here vendors in several categories that reflect real market differences in how a manufacturer would actually choose between them. Let’s review what’s included in each of them.
Global Systems Integrators
Global systems integrators open the list, scaling multi-plant, multi-country modernization programs under a broader digital transformation contract.
DXC Technology
HQ: Ashburn, Virginia, USA
Core services: Enterprise application and infrastructure modernization
Target segment: Large defense-adjacent manufacturers
DXC Technology offers next-generation MES to PLM and ERP, pushing 3D work instructions from engineering straight to the shop floor systems. This is particularly relevant when plant modernization is part of a larger enterprise technology program. That architecture proves that modernizing the MES alone may solve only part of the problem since data have to remain synchronized if the manufacturer wants end-to-end traceability.
GlobalLogic
HQ: San Jose, California, USA
Core services: IT/OT integration, industrial software platforms
Target segment: Large industrial and rail manufacturers
GlobalLogic (with their partner Flexware Innovation) deployed the LIFT orchestration platform at Hitachi Rail’s new train-manufacturing facility in Hagerstown, Maryland. They connected PLC, SCADA, ERP, MES, and WMS environments using OPC UA and MQTT, supporting shop-floor coordination that included automated guided vehicles, demonstrating the integrator’s ability to run this kind of program at scale.
EPAM Systems
HQ: Newtown, Pennsylvania, USA
Core services: Data platforms, IoT and digital twin development
Target segment: Enterprise manufacturers and industrial equipment makers in semiconductor manufacturing, industrial equipment, oilfield services
EPAM approaches manufacturing legacy PLC and SCADA modernization primarily from the digital engineering and enterprise technology side. Their industrial portfolio includes production-data platforms, IoT solutions, digital twins, and broader application modernization that can be particularly useful for manufacturers struggling to extract, normalize, and use industrial data.
Industrial Automation and Platform Vendors
Industrial automation and platform vendors are the best fit for manufacturers modernizing legacy PLC, DCS, SCADA, and other OT environments without disruption.
Rockwell Automation
HQ: Milwaukee, Wisconsin, USA
Core services: FactoryTalk MES suite, PlantPAx distributed control system, and purpose-built legacy MES migration tooling
Target segment: Process and discrete manufacturers in agrochemical, food and beverage, water/wastewater, heavy process industries
Rockwell Automation occupies a different position from other manufacturing legacy modernization companies. For plants already using Allen-Bradley and Rockwell infrastructure, their digital software engineering skills create obvious advantages. Furthermore, Rockwell understands the control environment at a level that a general software integrator may not, with tooling specifically designed for industrial automation.
Honeywell
HQ: Charlotte, North Carolina, USA
Core services: Honeywell Forge industrial platform, OT cybersecurity
Target segment: Large, multi-site manufacturers, especially chemical and process industries
Honeywell combines enterprise-level industrial software and OT cybersecurity. That makes it particularly relevant for manufacturers not simply replacing an application, but gaining visibility across a brownfield environment.
Plus, their Forge Cybersecurity and Cyber Insights capabilities report a reduction in asset-discovery time and an improvement in asset-classification accuracy. This is a useful proof point for manufacturers trying to establish an accurate OT asset inventory before ERP modernization or cybersecurity programs can move forward.
MES and SAP ME Specialists
Smaller, deeply specialized shops are usually a good fit when the modernization scope is narrowly MES/ERP integration.
Empowered Automation Solutions
HQ: Chicago, Illinois, USA
Core services: MES-to-PLC integration, SAP-MES connectivity, plant-floor system integration
Target segment: Small to mid-size North American manufacturers
Empowered Automation Solutions is a narrowly focused integrator built specifically around the MES-PLC-ERP handoff. Rather than selling a broad digital transformation program, their stated specialization focuses on the handoff between MES, PLC, and ERP systems. That can make a smaller specialist attractive when the problem is clearly specified.
Manufacturing-Focused Delivery Partners
Manufacturing-focused delivery partners offer a dedicated engineering team for complex MES/ERP and custom manufacturing software where modernization extends beyond a single automation platform and requires ongoing software development.
ScienceSoft
HQ: McKinney, Texas, USA
Core services: MES consulting and implementation, enterprise system modernization, IoT integration, production analytics
Target segment: Mid-market and enterprise manufacturers
ScienceSoft has one of the longest histories among the companies included here. Their manufacturing offering covers MES consulting and implementation, IoT integration, enterprise application modernization, and production analytics. That breadth makes it suitable for manufacturers whose modernization requirements sit above the PLC/control layer but still require strong manufacturing-domain knowledge.
SoftServe
HQ: Austin, Texas, USA
Core services: data engineering, machine learning, legacy data-platform modernization
Target segment: Mid-size to large semiconductor and microelectronics manufacturing
SoftServe is particularly interesting when there is an industrial legacy modernization bottleneck. For a global manufacturer of refrigeration and testing equipment, SoftServe consolidated information spread across more than 10 legacy systems, some connected to testing practices approximately 2 decades old.
Devox Software
HQ: Miami, Florida, USA
Core services: Legacy application and infrastructure modernization paired with dedicated MES/ERP modernization, SCADA-to-unified-namespace smart-factory work
Target segment: Mid-market manufacturers in logistics and automotive
Devox Software’s value sits at the intersection of their industrial legacy modernization services and their manufacturing software development services. Thanks to solid AI-powered dependency-mapping and AI Solution Accelerator™, migration-planning time is typically cut by 70%.
Devox Software sits between a conventional software modernization partner and a manufacturing software engineering company: a project may begin as an ERP modernization but reveal brittle MES integrations, an MES upgrade may expose inconsistent production data, a predictive-maintenance initiative may discover that telemetry remains trapped in SCADA historians, and so on.
That makes Devox Software most relevant to manufacturers looking for a dedicated engineering partner that brings AI use cases in MES modernization, rather than a platform vendor.
Quick Comparison
| Company | Category | HQ | Best fit for |
| Rockwell Automation | Platform vendor | Milwaukee, WI, USA | Plants already standardized |
| GlobalLogic (Hitachi) | Global systems integrator | San Jose, CA, USA | Large, multi-system shop-floor IT |
| DXC Technology | Global systems integrator | Ashburn, VA, USA | Defense |
| Honeywell | Automation/platform vendor | Charlotte, NC, USA | Large, multi-site manufacturing projects |
| EPAM Systems | Global systems integrator | Newtown, PA, USA | Data platforms and digital twins alongside modernization |
| Empowered Automation Solutions | MES/SAP ME specialist | Chicago, IL, USA | Single-site MES-PLC integration |
| ScienceSoft | Manufacturing delivery partner | McKinney, TX, USA | Broad MES consulting and implementation |
| SoftServe | Manufacturing delivery partner | Austin, TX, USA | Data-heavy legacy process modernization |
| Devox Software | Manufacturing delivery partner | Miami, FL, USA | Combined legacy and manufacturing software delivery |
Modernize or Replace?
Not every legacy MES, SCADA layer, or ERP instance needs a rip-and-replace, and not every legacy environment needs a full mainframe modernization program. Honest framing is always a spectrum. Rehosting a legacy application onto modern infrastructure with minimal code changes is fast and low-risk but doesn’t fix underlying architecture problems. On the other hand, refactoring or rebuilding removes technical debt but costs more and takes longer. Last but not least, replacing a legacy MES or ERP outright carries the highest data-migration and retraining risks.
That’s why the right choice depends on actual systems and goals: for instance, how much of the plant’s actual process knowledge is encoded and how much downtime risk the business can tolerate.
If you’re interested in how a continuous, incremental approach outperforms a big-bang cutover and where it doesn’t, check our materials before you scope the project either way.
Conclusion
Industrial software modernization is judged on the reality of shop floor systems. Even the best manufacturing legacy modernization companies rely on manufacturing reality rather than any smart factory and Industry 4.0 migration promises.
Moreover, each company has a pronounced specialization. For instance, DXC and EPAM bring integrator scale, while Empowered Automation goes deep on the MES/SAP layer specifically, and Devox Software offers a dedicated delivery team for a holistic, AI-powered approach. Use the criteria we stated above, not brand recognition alone, and decide which one fits your plant’s constraints and opportunities better.
Frequently Asked Questions
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Who modernizes legacy MES and SCADA systems?
OEMs, or Original Equipment Manufacturers, like Rockwell Automation, approach modernization on their own control hardware.
Global integrators, including DXC, EPAM, and GlobalLogic, run large, multi-system (and multi-year) MES/ERP/IT-OT transformation programs.
Specialist or mid-market partners ScienceSoft, SoftServe, and Devox Software are focused on MES, SCADA, and PLC modernization at single- or multi-plant scale with AI-powered tools.
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How do you modernize plant systems without stopping production?
Manufacturing legacy modernization companies in this list modernize in phases, as the legacy and new systems must run in parallel for downtime-free migration.
Moreover, dual-write or shadow-mode data flows validate the new system against live production data, and changes roll out one line or plant at a time inside existing maintenance windows.
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What is OPC UA migration in manufacturing?
The OPC Unified Architecture (OPC UA) specification is a multi‑part industrial interoperability standard incorporating core concepts, security, address space modeling, services, information models, mappings, profiles, and domain‑specific extensions for modern environments.
OPC UA migration is the process of migrating legacy industrial communication and data exchange toward the OPC Unified Architecture standard. Thanks to it, manufacturers connect older PLCs, SCADA, MES, and shop-floor systems with modern apps.
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What does manufacturing industrial legacy modernization cost?
Industrial legacy modernization cost varies depending on scope. For instance, a narrow MES-to-PLC integration is easier than a multi-plant SCADA-to-cloud program. So as the industrial environments differ, the costs of the project will differ too: from $150,000 for a contained migration up to $1,000,000 or more for a multi-site MES or ERP rebuild.
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Brownfield vs. greenfield modernization for a running plant?
Brownfield modernization is the practical default for an operating plant. It preserves working systems and machinery while modernizing only the software and data layers around them. Your equipment stays with you, while vendors additionally introduce OPC UA or MQTT connectivity, edge gateways, and so on incrementally to keep the systems running without disruption.
Greenfield modernization, by contrast, rebuilds the technology stack. That’s why it’s better suited to a new plant or a facility undergoing a major rebuild.
The goal of brownfield modernization is therefore not to replace everything legacy, but to retain what works and add value to existing assets, making it the practical default for any plant that’s already operating.
