Legacy systems still run many Dutch organizations but often slow them down with high costs and inflexibility. Top companies in the Netherlands specialize in modernizing these setups through careful updates and smart transformations.

These companies provide practical solutions like gradual migrations, cloud integrations, and application refactoring. They help various industries reduce risks, improve scalability, and align technology with current business needs while keeping operations smooth

1. Oski Solutions

OSKI Solutions delivers legacy system modernization in the Netherlands. Our work supports Dutch organizations that need to update older systems while keeping operations stable and aligned with local market requirements. We pay close attention to the specifics of doing business here, from regulatory considerations to the practical needs of sectors like fintech, healthcare, and logistics.

Our team's custom software development plays a central role in these modernization efforts. OSKI Solutions applies expertise with technologies such as .NET and cloud platforms to create smoother transitions from legacy setups. API integration and microservice approaches help connect old and new parts effectively.

Key Highlights:

• Support for legacy system updates tailored to Dutch organizations

• Expertise in cloud migration combined with modernization

• Focus on stable transitions for key industry sectors

Services:

• Legacy system modernization

• Custom software development

• Cloud migration

• Digital transformation

• API integration

Contact Information:

• Website: oski.site

• E-mail: [email protected]

• LinkedIn: www.linkedin.com/company/oski-solutions

• Address: Kaupmehe tn 7, 10114 Tallinn, Estonia

• Phone: +48571282759

2. Cloud.nl

Cloud.nl helps organizations deal with old applications that have become risky and hard to maintain. The company focuses on step-by-step modernization instead of risky big bang approaches. Cloud.nl handles everything from COBOL systems to container setups while keeping business critical functions running smoothly during transitions.

The company starts with legacy assessments to identify issues like outdated PHP or MySQL versions. Cloud.nl then stabilizes systems before moving to containerization and further updates where it makes sense. The company emphasizes reversible steps and trade-off decisions between full modernization and isolation for stability.

Key Highlights:

• Step-by-step modernization without big bang risks

• Experience with various legacy languages and servers

• Focus on testable and reversible updates

Services:

• Legacy modernization

• Cloud migration

• Managed cloud services

• Hybrid cloud setups

• Compliance support

Contact Information:

• Website: cloud.nl

• Phone: 0800-2568365

• Email: [email protected]

• Address: Hoge Ham 93 b, 5104 JC Dongen, The Netherlands

3. SoftPro

SoftPro supports legacy system modernization for companies in the Netherlands. The company applies technologies like Azure and Microsoft stack to update existing systems. This helps Dutch organizations move toward more efficient and scalable solutions suited to local business needs.

The agency delivers custom software and cloud development as part of modernization projects. SoftPro works on web applications and AI features where they fit the update process. The company keeps solutions practical and aligned with specific client requirements in the Dutch market.

Key Highlights:

• Modernization using Microsoft technologies

• Cloud migration support for legacy systems

• Custom solutions for Dutch organizations

Services:

• Legacy system modernization

• Web application development

• Cloud development

• Artificial intelligence

• Software development

Contact Information:

• Website: soft-pro.pl

• Phone: +48 571 282 759

• Address: Poland, Warsaw, Mazowieckie Voivodeship, 13 Erasmus Ciołka St. 401

• LinkedIn: www.linkedin.com/in/kyrylo-o

4. Finaps

Finaps builds custom software solutions that connect people, systems, and processes for organizations. The company combines business analysis with development work and uses AI tooling to speed up delivery while maintaining quality. Finaps also unlocks data value through platforms, analytics, and agentic AI applications that support better decision making.

The company provides technology advisory services including assessments and strategic guidance. Finaps delivers web applications, mobile solutions, data platforms, and legacy modernization projects. The company acts as a long-term partner with hands-on engineering while helping with AI readiness and quality assurance.

Key Highlights:

• Custom software tailored to organizational needs

• Data platforms and agentic AI solutions

• Technology assessments and advisory support

Services:

• Custom software development

• Data and agentic AI solutions

• Technology advisory

• Legacy modernization

• AI readiness scans

Contact Information:

• Website: finaps.nl

• Phone: +31(0)30 699 70 40

• Email: [email protected]

• Address: Emmaplein 10, 1075 AW Amsterdam

• LinkedIn: www.linkedin.com/company/finaps

• Facebook: www.facebook.com/people/Finaps/100054432343618

5. Exxan

Exxan provides strategic IT architecture and fractional CTO support for companies in the Benelux region. The company focuses on modernizing legacy systems using approaches like domain-driven design and event-driven architecture without full rewrites. Exxan helps with technical due diligence, architecture assessments, and roadmaps that align technology with business goals.

The company works on pragmatic transformations that deliver value today while building for tomorrow. Exxan offers coaching on modern practices such as DDD and CQRS through workshops and hands-on support. The company operates from Utrecht and supports scale-ups as well as established organizations across relevant areas.

Key Highlights:

• Fractional CTO and architecture transformation

• Legacy modernization with domain-driven design

• Technical due diligence and IT audits

Services:

• IT architecture assessment

• Technical due diligence

• IT roadmap development

• Team coaching on modern practices

Contact Information:

• Website: exxan.nl

• Phone: +31 6 33 969 714

• Email: [email protected]

• LinkedIn: www.linkedin.com/in/ldemouge

6. NexaTech Solutions

NexaTech Solutions delivers enterprise IT services with a focus on Dutch regulatory requirements. The company handles cloud migrations across major providers and supports AI integration for workflow automation. NexaTech Solutions also provides managed cybersecurity and compliance services tailored to local needs.

The company works on digital transformation projects including legacy modernization and business process automation. NexaTech Solutions offers DevOps infrastructure setups, custom software development, and nearshore development teams. The company maintains transparent delivery with fixed scopes for predictable project outcomes.

Key Highlights:

• Cloud migration and managed cloud operations

• NIS2 and DORA compliance support

• AI workflow automation capabilities

Services:

• Managed cybersecurity

• Cloud migration

• AI integration

• IT compliance

• DevOps engineering

• Legacy modernization

Contact Information:

• Website: nexatechsolutions.nl

• Email: [email protected]

7. PwC

PwC supports mainframe to cloud transformation as a business change that affects the whole organization. The company developed an end-to-end approach together with Microsoft that covers people, processes, and technology aspects. PwC creates strategic roadmaps for decommissioning mainframes while managing complex stakeholder decisions at C-level.

The company focuses on realistic solutions that deliver value with reduced risk through standardization and synergy across the value chain. PwC provides governance throughout the process from planning to go-live. The company builds secure landing platforms in Azure for mission-critical workloads and addresses security, finance, operations, and human factors in large-scale migrations.

Key Highlights:

• End-to-end mainframe to cloud transformation

• Strategic roadmap development for decommissioning

• Change management for different organizational roles

Services:

• Technology transformation

• Cloud solutions

• Governance support

• Security implementations

Contact Information:

• Website: www.pwc.nl

• Phone: +31 8879 20020

• Address: Prinses Beatrixlaan 542, Toren-C 8e etage 2595 BM, Netherlands

• LinkedIn: www.linkedin.com/company/pwc-nederland

• Facebook: www.facebook.com/PwCinNederland

• Twitter: x.com/PwC_Nederland

• Instagram: www.instagram.com/pwcnl

8. Accenture

Accenture works on technology transformation and reinvention for organizations facing constant change. The company helps with AI adoption, cloud capabilities, and digital engineering projects that support business growth. Accenture maintains a wide range of partnerships and industry expertise across sectors like banking, insurance, and manufacturing.

The company addresses legacy challenges as part of broader modernization efforts within technology transformation services. Accenture focuses on practical approaches that combine data, AI, and new ways of working. The company supports clients in building resilience and innovation through continuous strategy adjustments.

Key Highlights:

• Technology transformation capabilities

• AI and data integration support

• Cloud and digital engineering services

Services:

• Artificial intelligence

• Cloud solutions

• Cybersecurity

• Strategy consulting

• Managed services

Contact Information:

• Website: www.accenture.com

• Phone: +31204938383

• Address: Gustav Mahlerplein 90, Amsterdam, Netherlands, 1082 MA

9. .NET Developers

.NET Developers approach legacy system modernization with senior engineers guiding AI-augmented workflows. The company works across different stacks to update enterprise systems while keeping architecture decisions in human hands. This method suits organizations in the Netherlands that need reliable modernization without compromising on quality.

The agency includes cloud platform services and modern front-end updates in modernization projects. .NET Developers follows a structured delivery process from discovery through to ongoing support. The company maintains transparent practices throughout the update work.

Key Highlights:

• Senior-led modernization with AI support

• Cloud-native architecture for legacy updates

• Full delivery process for system modernization

Services:

• Legacy system modernization

• Enterprise development

• AI engineering

• Cloud platform services

• Modern front-end development

Contact Information:

• Website: net-devs.com

• Phone: +48 571 282 759

• Email: [email protected]

• Address: Obrzeżna 1D, 02-691 Warszawa

• LinkedIn: www.linkedin.com/company/net-devs

10. Capgemini

Capgemini delivers services across various sectors with an emphasis on innovation and digital solutions. The company partners in areas like sports technology while applying expertise in AI and data-driven insights. Capgemini supports organizations in transforming operations through technology applications and strategic partnerships.

The company works on technology services that include modernization efforts within broader digital transformation initiatives. Capgemini maintains focus on practical implementation of advanced tools and analytics. The company operates with attention to industry-specific needs across multiple domains.

Key Highlights:

• Digital innovation support

• Technology partnership development

• Data and AI application expertise

Services:

• Technology services

• Digital transformation

• AI solutions

• Consulting support

Contact Information:

• Website: www.capgemini.com

• Phone: +31 (0)30 203 0500

• Address: Reykjavikplein 1, 3543 KA Utrecht, Postbus 2575 – 3500 GN

• LinkedIn: www.linkedin.com/company/capgemini

• Facebook: www.facebook.com/Capgemini

• Instagram: www.instagram.com/capgemini

11. IBM

IBM provides tools and solutions for modernizing complex codebases and accelerating software delivery. The company offers platforms that help understand code, implement changes safely, and move toward production environments. IBM supports hybrid cloud setups and AI-powered capabilities for enterprise needs.

The company delivers consulting services alongside technology products focused on automation and data management. IBM addresses modernization through practical tools that fit existing stacks. The company emphasizes secure and efficient transformations for mission-critical systems in various industries.

Key Highlights:

• Code modernization and software delivery tools

• Hybrid cloud and AI capabilities

• Consulting and automation services

Services:

• Technology consulting

• Cloud solutions

• AI integration

• Data management

Contact Information:

• Website: www.ibm.com

• Phone: +31 20 798 0099

• Address: Johan Huizingalaan 765, 1066 VH Amsterdam, Netherlands

• LinkedIn: www.linkedin.com/company/ibm

• Twitter: x.com/ibm

• Instagram: www.instagram.com/ibm

12. HCLTech

HCLTech delivers technology services centered on AI, cloud, and engineering solutions for enterprises. The company helps organizations identify opportunities to automate processes and drive efficiencies through AI and generative AI capabilities. HCLTech provides cloud optimization services that support innovation and agility at scale.

The company focuses on engineering and R&D services to accelerate product development and streamline operations. HCLTech works across multiple industries including financial services, manufacturing, and healthcare. The company maintains delivery capabilities while supporting digital transformation efforts in the Netherlands context.

Key Highlights:

• AI and generative AI services

• Cloud optimization offerings

• Engineering and R&D support

Services:

• AI solutions

• Cloud services

• Engineering services

• Application development

• IT infrastructure management

Contact Information:

• Website: www.hcltech.com

• Address: Kantoorunit 2, Keizersveld 47, Venray, Netherlands 5803 AM

• LinkedIn: www.linkedin.com/company/hcl-technologies

• Facebook: www.facebook.com/HCLTechOfficial

• Twitter: x.com/hcltech

• Instagram: www.instagram.com/hcltech

13. BearingPoint

BearingPoint operates as a management and technology consultancy with European roots. The company applies intelligent transformation approaches that combine management consulting with technology expertise across different sectors. BearingPoint develops products and services focused on data, AI, and operational improvements.

The company supports organizations in areas like sustainability, resilience, and supply chain management. BearingPoint offers ERP support and outcome-based solutions through its store platform. The company maintains a presence in the Netherlands while working on digital transformation projects.

Key Highlights:

• Management and technology consulting

• AI and data management solutions

• ERP support services

Services:

• Technology consulting

• Digital transformation

• Sustainability advisory

• Operations support

• Product development

Contact Information:

• Website: www.bearingpoint.com

• Phone: +31 20 504 90 00

• Email: [email protected]

• Address: De Entree 89, NL-1101BH Amsterdam, The Netherlands

• LinkedIn: www.linkedin.com/company/bearingpoint

14. 21century.tech

21century.tech focuses on legacy system modernization through an AI-native approach. The company combines senior engineers with AI tools to speed up updates of older systems while maintaining quality control. This setup proves useful for organizations in the Netherlands dealing with outdated software that needs faster modernization without losing reliability.

The agency handles production software projects with emphasis on quick refactors and MVPs. 21century.tech follows a clear process from initial brief to deployment. The company keeps human oversight on key decisions during modernization work.

Key Highlights:

• AI-augmented legacy system updates

• Senior engineer oversight during modernization

• Production-grade delivery for older systems

Services:

• Legacy system modernization

• Custom software development

• Web application development

• Digital transformation

Contact Information:

• Website: 21century.tech

• Email: [email protected]

Conclusion

Picking the right partner for legacy system modernization in the Netherlands really comes down to understanding your specific situation. Some setups need careful, phased approaches to avoid disrupting daily operations, while others benefit from deeper cloud shifts or AI integrations that open up new possibilities. It’s worth taking time to assess what fits your industry, timeline, and risk tolerance.

The market here has solid options that handle everything from mainframe environments to custom-built platforms. Ultimately, the most successful projects seem to happen when organizations pair clear business goals with partners who listen first and customize second. That combination tends to deliver smoother transitions and lasting value.