If your business is still running on an old system that “just works,” you’re definitely not the only one. All across the U.S., plenty of companies are in the same boat - using software that’s been around forever, quietly keeping things together… until one day, it doesn’t.

Modernizing these legacy systems isn’t only about replacing old tech with something shiny and new. It’s really about setting your business up to perform better, scale faster, and make smarter use of data - all the things older platforms were never built to handle.

In this guide, we’ll take a closer look at some of the top companies in the U.S. that help organizations modernize their systems. These aren’t just tech vendors; they’re the people helping bridge the gap between yesterday’s infrastructure and tomorrow’s digital business.

 

1. OSKI Solutions

We focus on helping companies in the U.S. and abroad modernize their legacy systems and move toward more flexible, reliable software environments. Many of the businesses we work with still operate on platforms that were built years ago, and over time those systems have become harder to maintain and integrate. Our role is to reimagine those systems using modern technologies like .NET, Node.js, and cloud platforms such as Azure and AWS. By rebuilding or transforming these older solutions, we help organizations improve scalability, data flow, and long-term performance without disrupting their existing operations.

Modernization, for us, is not just a technical exercise. It’s about understanding how a system supports daily work and where it can do better. We approach each project with attention to the details that keep business processes running smoothly, whether it’s integrating with an ERP, rebuilding core logic, or migrating data to the cloud. Our work spans several industries, including logistics, healthcare, e-commerce, and finance, and each modernization project reflects the unique challenges of that field. The result is software that is easier to manage, update, and expand when the business grows.

Key Highlights:

• Focus on reengineering outdated software for better scalability and maintainability
• Practical experience with modernization in multiple industries
• Strong backend and frontend expertise (.NET, Node.js, React, Angular, Vue)
• Proficiency in cloud and DevOps (Azure, AWS, Docker, CI/CD)
• Flexible project management and long-term cooperation with clients

Services:

• Legacy system modernization and redevelopment
• Cloud migration and infrastructure setup
• Custom web and software application development
• API design and integration with existing platforms
• Frontend and UI/UX modernization
• Dedicated software development teams
• Continuous maintenance and technical support

Contact and Social Media Information:

• Website: oski.site
• Address: Kaupmehe tn 7-120, Tallinn, Estonia
• Phone: +48571282759
• E-mail: contact@oski.site 
• LinkedIn: www.linkedin.com/company/oski-solutions

 

2. ELEKS

ELEKS provides legacy system modernization solutions that help organizations across the USA transition from outdated software to modern, adaptable architectures. Their work focuses on transforming existing systems into scalable and secure environments capable of handling today’s business needs. They approach modernization through a combination of cloud technologies, intelligent automation, and AI integration, allowing companies to reduce operational risks and improve performance without losing essential business logic. With experience in industries like finance, healthcare, logistics, and government, ELEKS supports teams that need to reengineer core platforms for better flexibility and long-term usability.

Their modernization process typically includes re-architecting legacy applications, optimizing infrastructure, and integrating newer components into existing workflows. This practical, engineering-driven approach helps organizations align technology updates with business goals while maintaining operational continuity. ELEKS’ teams also pay close attention to security and compliance throughout modernization projects, embedding best practices from early development stages. Their work with major cloud providers such as AWS, Google Cloud, and Microsoft Azure enables smoother migrations and future-ready solutions tailored to complex enterprise environments.

Key Highlights:

• Experience in large-scale modernization across multiple industries
• Expertise in cloud migration, DevOps, and intelligent automation
• Focus on performance, scalability, and maintainability of systems
• Security-first modernization approach backed by global certifications
• Integration of AI, agentic AI, and machine learning technologies

Services:

• Legacy system reengineering and modernization
• Cloud migration and infrastructure optimization
• AI and intelligent automation integration
• Application architecture redesign and refactoring
• DevOps consulting and agile transformation
• Cybersecurity and compliance support
• Continuous system maintenance and technical improvement

Contact and Social Media Information:

• Website: eleks.com
• Address: 625 W. Adams St., Chicago, IL 60661 
• Phone:  +1-708-967-4803
• LinkedIn: www.linkedin.com/company/eleks
• Twitter: x.com/ELEKSSoftware
• Facebook: www.facebook.com/ELEKS.Software

 

3. Syberry

Syberry provides legacy system modernization services designed to help organizations in the USA move away from outdated software that limits growth and efficiency. Their approach centers on transforming legacy applications into scalable, secure, and cloud-ready systems that align with current business goals. They focus on rehosting, refactoring, and re-architecting older systems to improve performance and ensure better integration with modern technologies. By applying practical engineering practices, Syberry helps companies maintain continuity while upgrading their infrastructure for greater agility and long-term usability.

Their modernization process is methodical and adaptable, beginning with an in-depth system assessment to identify key areas for improvement. From there, they integrate automation, DevOps, and cloud migration to optimize development workflows and reduce maintenance costs. Their team also prioritizes user experience and data security throughout each stage, which is particularly important for clients in sectors like finance, healthcare, and energy. For many US-based organizations, Syberry’s modernization efforts serve as a bridge between established business operations and future-ready digital ecosystems.

Key Highlights:

• Structured approach to legacy system modernization, from assessment to deployment
• Experience across finance, healthcare, energy, and education sectors
• Focus on scalability, compatibility, and long-term maintainability
• Integration of automation and DevOps for streamlined development cycles
• Cloud-first strategy supporting hybrid and microservices architectures

Services:

• Application assessment and modernization roadmapping
• Rehosting, replatforming, and refactoring of legacy systems
• Re-architecting applications using microservices and cloud-native models
• Containerization and hybrid cloud deployment
• DevOps integration and CI/CD implementation
• Cloud migration and optimization
• Security compliance and performance improvement
• Continuous support and maintenance for modernized systems

Contact Information:

• Website: www.syberry.com
• E-mail: contact@syberry.com
• LinkedIn: www.linkedin.com/company/syberry
• Address: 5910 Courtyard Drive STE 105, Austin TX 78731
• Phone: +1 (512) 400-0056

 

4. Edvantis

Edvantis works with U.S. organizations that want to update outdated software and make it more adaptable to modern business needs. Their legacy system modernization efforts focus on helping companies move from aging platforms to more flexible, secure, and cloud-ready systems. They often take a structured approach that begins with analyzing the existing infrastructure, identifying technical bottlenecks, and creating a roadmap for transformation. By modernizing legacy environments, Edvantis helps clients improve software maintainability and ensure smoother integration with newer tools and technologies.

Their experience spans industries such as healthcare, fintech, real estate, and logistics, where system reliability and performance are critical. They handle modernization projects that include migrating legacy databases, updating architecture, or redesigning outdated user interfaces. In many cases, they combine modernization with data analytics, AI, and cloud adoption, allowing businesses to extend the value of their existing systems while reducing operational risks. Their focus is on aligning technology improvements with day-to-day business operations so organizations can evolve without disrupting ongoing work.

Key Highlights:

• Experience in legacy modernization for U.S. enterprises across multiple sectors
• Focus on gradual system transformation with minimal business disruption
• Expertise in integrating AI, analytics, and cloud capabilities into existing systems
• Emphasis on improving scalability, data handling, and long-term maintainability
• Practical approach to software migration, refactoring, and modernization planning

Services:

• Legacy system assessment and modernization strategy
• Application and database migration
• System refactoring and re-architecture
• Cloud migration and integration
• API development and modernization support
• Data analytics and AI implementation in legacy systems
• Continuous maintenance and technical optimization

Contact Information:

• Website: www.edvantis.com
• E-mail: us.info@edvantis.com
• Facebook: www.facebook.com/edvantis
• LinkedIn: www.linkedin.com/company/edvantis
• Instagram: www.instagram.com/edvantis
• Address: 303 Fifth Avenue St. 1101, New York, NY 10016, USA

 

5. OutSystems

OutSystems provides a low-code platform designed to help U.S. businesses modernize outdated systems and move toward more efficient, flexible architectures. Their approach centers on turning legacy applications into scalable, high-performing solutions that can integrate with modern technologies like AI, analytics, and cloud services. They emphasize practicality in modernization, helping organizations transition without disrupting core operations. This includes assessing current infrastructures, addressing technical debt, and replacing monolithic systems with agile, modular applications that are easier to manage and evolve.

Through their work with companies across industries such as healthcare, logistics, and finance, OutSystems has developed a strong understanding of how legacy systems can limit growth and innovation. Their low-code tools help bridge the gap between older infrastructure and current digital requirements by enabling faster development, simpler updates, and better scalability. Rather than focusing solely on new software creation, they focus on rebuilding and extending what organizations already have, ensuring technology keeps up with changing business demands.

Key Highlights:

• Focus on legacy system modernization through low-code development
• Helps organizations migrate from outdated infrastructure to scalable cloud-based platforms
• Emphasis on smooth transitions that minimize operational downtime
• Support for integrating AI, analytics, and automation into existing systems
• Experience across multiple industries including healthcare, logistics, and financial services

Services:

• Legacy system assessment and modernization planning
• Application migration and refactoring
• Cloud integration and platform scalability support
• API and database modernization
• Low-code application development for modernization projects
• Ongoing support and maintenance of modernized systems

Contact Information:

• Website: www.outsystems.com
• Twitter: x.com/OutSystems
• LinkedIn: www.linkedin.com/company/outsystems
• Instagram: www.instagram.com/lifeatoutsystems
• Address: 44 Farnsworth St 9th floor Boston, MA 02210
• Phone: +1 617 837 6840

 

6. DataArt

DataArt works with organizations in the U.S. to modernize legacy systems, particularly in industries where outdated technology can slow growth and efficiency. They approach modernization by carefully assessing existing applications, identifying pain points, and applying targeted updates rather than attempting full replacements. This method helps companies transform legacy platforms into more agile, cloud-compatible systems while minimizing disruptions to ongoing operations. Their focus is on aligning technology changes with business needs, ensuring that updates support both current requirements and future scalability.

In sectors like travel, healthcare, and finance, DataArt emphasizes integrating old and new systems in a way that preserves critical functions while improving performance and security. Their modernization strategy often includes cloud adoption, automation, and continuous improvements to reduce operational bottlenecks. By taking a structured approach, they address the technical debt and complexity inherent in older systems, making them more maintainable and responsive to evolving business demands.

Key Highlights:

• Incremental modernization approach for complex legacy systems
• Focus on aligning technology with business goals
• Expertise in integrating legacy systems with cloud platforms
• Strong presence in travel, healthcare, and finance industries
• Emphasis on minimizing operational disruptions during modernization

Services:

• Legacy system assessment and modernization planning
• Application modernization and code updates
• Cloud migration and infrastructure optimization
• Integration of legacy and new systems
• Automation and performance improvement initiatives
• Continuous monitoring and support for modernized systems

Contact Information:

• Website: www.dataart.com
• E-mail: New-York@dataart.com
• Facebook: www.facebook.com/DataArt.Dev
• Twitter: x.com/DataArt
• LinkedIn: en.linkedin.com/company/dataart
• Address: 475 Park Ave S #15, New York, NY 10016, United States
• Phone: +1 (212) 378-4108

 

7. Forbytes

Forbytes focuses on helping organizations in the U.S. modernize legacy systems in a way that keeps business operations running smoothly. They approach modernization as a structured, step-by-step process, starting with evaluating existing systems to identify areas of inefficiency, security gaps, and integration issues. Their work often involves updating code, re-architecting applications, or shifting systems to new platforms, aiming to make legacy software more flexible, scalable, and aligned with current business needs.

In addition to technical updates, Forbytes emphasizes planning and strategy as part of the modernization process. They support companies in selecting approaches that match their operational goals, whether that means incremental changes, cloud adoption, or full system redesigns. By treating modernization as an ongoing process rather than a one-time project, they help organizations reduce technical debt, improve system reliability, and prepare for evolving market and customer demands.

Key Highlights:

• Step-by-step approach to legacy system modernization
• Emphasis on aligning IT upgrades with business objectives
• Integration of modern technologies with existing systems
• Focus on improving security, performance, and scalability
• Guidance on choosing the right modernization strategy for each system

Services:

• Legacy system assessment and planning
• Application re-architecting and refactoring
• Rehosting and replatforming of legacy software
• Cloud migration and infrastructure updates
• System integration and digital transformation support
• Dedicated development teams and expert consulting

Contact Information:

• Website: forbytes.com
• Facebook: www.facebook.com/ForbytesSoftwareDevelopment
• Twitter: x.com/Forbytes1
• LinkedIn: www.linkedin.com/company/forbytes
• Instagram: www.instagram.com/forbytes
• Address: Boston. Massachusetts. 100 Cambridge Street
• Phone: +1 (617) 655-8305

 

8. MuleSoft

When it comes to bringing old systems into the modern world, MuleSoft has built quite a name for itself. Their big thing? APIs. They help U.S. companies connect their legacy software with newer apps so everything can talk to each other smoothly - without tearing everything down and starting from scratch.

Instead of replacing entire systems, MuleSoft focuses on integration. They use an API-led approach that basically acts as a bridge between old and new, giving businesses more flexibility and control over how their data flows. It’s a smart way to cut back on outdated middleware and keep critical info secure and accessible. They also back this up with solid training and consulting, helping teams get comfortable with the tools they’re using. Whether it’s handling big spikes in data traffic or moving toward more modular, modern architectures, MuleSoft makes modernization feel less like an overhaul and more like an evolution.

Key Highlights:

• API-led integration to connect legacy systems with modern applications
• Support for faster migration and implementation projects
• Reduced maintenance costs through decoupling legacy systems
• Capacity to handle high-demand data requests without system disruption
• Unified platform for integration, automation, and lifecycle management

Services:

• Legacy system assessment and modernization planning
• API management and integration
• Automation and RPA implementation
• Training and certification programs
• Business Value Services and executive-level support
• Platform support and technical consulting

Contact Information:

• Website: www.mulesoft.com
• Facebook: www.facebook.com/MuleSoft
• Twitter: x.com/MuleSoft
• LinkedIn: www.linkedin.com/company/mulesoft
• Instagram: www.instagram.com/mulesoft
• Address: Inc. Salesforce Tower, 415 Mission Street, 3rd Floor, San Francisco, CA 94105, United States
• Phone: 1-800-596-4880

 

9. DOOR3

DOOR3 provides services for modernizing legacy systems in the U.S., focusing on improving performance, security, and scalability of existing applications. Their approach involves assessing legacy systems, mapping current processes, and designing migration strategies that reduce disruption to ongoing operations. By leveraging cloud-native technologies and modular system designs, they help organizations make their legacy applications more adaptable and efficient, supporting evolving business requirements without requiring a full system replacement.

Their teams also emphasize practical execution through agile and DevOps practices, ensuring legacy systems are upgraded with minimal downtime while meeting compliance and security standards. DOOR3 works across a variety of legacy platforms, including Visual FoxPro, Microsoft Access, and Delphi applications, and also redesigns system architecture and user interfaces. This approach allows companies to integrate older systems with modern tools and platforms, improving accessibility, maintainability, and operational flexibility.

Key Highlights:

• Legacy system assessment and modernization roadmap
• Migration to cloud-native platforms and modular architecture
• Security and compliance integration during modernization
• Enhanced performance, scalability, and reliability
• Agile and DevOps practices to support transition

Services:

• Legacy application assessment and strategic planning
• Application modernization and migration
• Architecture and technology modernization
• UI/UX redesign and optimization
• Testing, deployment, and post-migration support
• Staff training and continuous maintenance

Contact Information:

• Website: www.door3.com
• E-mail: projects@door3.com
• Twitter: x.com/door3
• Address: 370 Lexington Ave. Suite 1806 New York, NY, 10017 United States
• Phone: +1 (212) 673-1818

 

10. Computools

Computools focuses on modernizing legacy software systems in the USA by aligning modernization efforts with current and future business requirements. Their approach begins with detailed audits and advisory services to identify technical challenges and risks, helping organizations decide whether and how to modernize their software. They address issues like vendor lock-in, rising IT costs, and inaccessible data, ensuring that system transformations are planned carefully and executed with minimal disruption. By updating legacy applications, they aim to make systems more maintainable, secure, and compatible with modern technologies.

The company also works on migrating legacy applications to modern platforms, refactoring code, and re-engineering entire systems when necessary. Their teams enhance usability and user experience through UI/UX redesigns and ensure connectivity through API integration, supporting seamless communication between legacy and modern systems. Computools provides comprehensive testing and ongoing support to maintain system reliability, helping organizations adapt to evolving operational and market demands.

Key Highlights:

• Legacy system advisory and strategic planning
• Comprehensive software audits for performance and compatibility
• Migration of applications and data to modern platforms
• Legacy code refactoring and system re-engineering
• UI/UX redesign to improve accessibility and user experience
• API integration for connecting legacy and modern systems
• End-to-end software testing and long-term support

Services:

• Legacy system advisory and assessment
• Legacy software audit
• Legacy system migration
• Legacy code refactoring
• Legacy software re-engineering
• Legacy application modernization
• UI/UX redesign
• API integration
• Software testing and support

Contact Information:

• Website: computools.com
• E-mail: jv@computools.com
• Address: New York, 430 Park Ave, NY 10022
• Phone: +1 917 348 7243

 

11. Sigma Software

Sigma Software provides legacy system modernization services in the USA by helping organizations update outdated applications and infrastructure to meet modern business and technology needs. They work with enterprises, startups, and product companies to analyze existing systems, identify inefficiencies, and plan structured modernization paths. Their approach often combines custom software development, IT consulting, and dedicated team support to ensure that legacy systems are not only upgraded but also aligned with ongoing operational goals. They focus on improving maintainability, performance, and security while keeping business processes running smoothly during the transition.

The company also emphasizes integrating legacy systems with modern platforms and technologies. By redesigning software components, refactoring code, and implementing new architectural solutions, they help organizations increase flexibility and scalability. Their teams support the deployment of modern solutions while providing ongoing monitoring and maintenance, ensuring that modernized systems remain reliable and adaptable as business demands evolve. This practical approach makes legacy system modernization a continuous process rather than a one-time project.

Key Highlights:

• Custom software development for legacy modernization
• IT consulting and technical advisory for system upgrades
• Dedicated software teams for project execution
• System analysis and modernization strategy planning
• Integration of legacy systems with modern technologies
• Code refactoring and architecture redesign
• Ongoing monitoring and support for modernized systems

Services:

• Legacy system assessment and advisory
• Custom software development
• IT consulting for modernization
• Dedicated software team management
• System integration and API implementation
• Code refactoring and architecture updates
• Continuous support and maintenance

Contact Information:

• Website: sigma.software
• E-mail: info@sigma.software
• Facebook: www.facebook.com/SIGMASOFTWAREGROUP
• Twitter: x.com/sigmaswgroup
• Instagram: www.instagram.com/sigma_software
• Address: 106 W 32nd Street, 2nd Floor, SV#05 The Yard – Herald Square  New York, NY 10001
• Phone: +19293802293

 

12. Devico

Devico works with organizations in the USA to modernize legacy systems, helping them transition from outdated software to more flexible and scalable solutions. They focus on updating applications, migrating data to cloud environments, and reengineering legacy software to work with contemporary technologies. Their approach includes assessing existing systems for inefficiencies, identifying critical functionalities, and designing modernization strategies that maintain core business logic while improving agility, performance, and security. They also address common challenges such as slow response times, frequent system outages, and high maintenance costs, which often accompany older systems.

The company supports modernization through multiple strategies, ranging from partial code updates to complete system rewrites, depending on the business’s needs and goals. They also help organizations move desktop applications to web or mobile platforms and integrate legacy systems with modern SaaS solutions. In addition to software and cloud migration, they provide ongoing maintenance, UI/UX updates, and support for automation, AI, and data modernization, ensuring that modernized systems remain reliable and adaptable over time.

Key Highlights:

• Modernization of mainframe and legacy applications
• Cloud migration and integration with modern platforms
• Transition from desktop to web and mobile applications
• Rewriting, re-architecting, and refactoring of legacy software
• Enhancement of security, scalability, and performance
• Data modernization and improved operational control
• Support for AI, automation, and advanced technologies

Services:

• Legacy application modernization
• Custom software modernization
• Cloud migration and architecture planning
• Data modernization and database upgrades
• API integration and system connectivity
• UI/UX redesign and modernization
• Maintenance and technical support

Contact Information:

• Website: devico.io
• E-mail: info@devico.io
• Facebook: www.facebook.com/devicosolutions
• LinkedIn: www.linkedin.com/company/devicosolutions
• Address: 521 Fifth Ave, NY 10175, New York, USA
• Phone: +1 805 491 9331

 

13. Vention

Vention provides legacy system modernization services in the USA, helping companies update outdated applications and infrastructures to meet modern business and technology standards. Their teams focus on transforming legacy software through code refactoring, cloud migration, and system reengineering to improve scalability, performance, and security. They work closely with clients to understand how legacy systems impact daily operations and then build modernization strategies that balance business continuity with technological improvement. This structured, step-by-step approach helps organizations reduce technical debt and prepare their systems for long-term growth and integration with new digital tools.

They also offer consulting and full-scale modernization support for companies that need to re-architect or completely rebuild legacy systems. Whether transitioning from monolithic structures to microservices or integrating APIs for better connectivity, their modernization efforts are designed to make software more flexible and future-ready. In practice, this means helping businesses move critical systems to the cloud, adopt DevOps practices for continuous improvement, and incorporate modern UI/UX and automation tools. Their work emphasizes stability during the transition while ensuring that upgraded systems can easily adapt to evolving business needs.

Key Highlights:

• Code refactoring to improve legacy software quality and maintainability
• Cloud migration and hybrid-cloud modernization
• Re-architecting legacy systems to microservices and serverless models
• Application rebuilding and full replacement when necessary
• Integration of APIs and modern platforms for seamless interoperability
• DevOps and containerization to ensure efficient deployment
• Focus on scalability, compliance, and performance optimization

Services:

• Legacy system and application assessment
• Code refactoring and optimization
• App modernization consulting
• Cloud migration and infrastructure modernization
• System reengineering and re-architecture
• API development and integration
• UI/UX updates and modernization
• Ongoing support and maintenance

Contact Information:

• Website: ventionteams.com
• E-mail: hello@ventionteams.com
• Twitter: x.com/ventionteams
• LinkedIn: www.linkedin.com/company/ventionteams
• Instagram: www.instagram.com/ventionteams
• Address: 575 Lexington Avenue, 14th Floor
NY 10022
• Phone: +1 (718) 374-5043

 

14. Application Modernization Services

Application Modernization Services helps businesses breathe new life into old systems - without throwing everything out and starting from scratch. They focus on upgrading outdated software so it actually fits how companies work today, keeping what’s already functional while improving speed, flexibility, and security.

Instead of rushing into a full rebuild, they start by really getting to know the system - what’s slowing things down, what’s still solid, and where it makes sense to modernize. From there, they build a custom roadmap that balances quick wins with long-term goals. The idea is to make technology work better now while setting it up to evolve down the line. Their team often helps U.S. companies move from on-premise setups to the cloud, connect old platforms with new ones, and automate the tedious, manual stuff that eats up time. It’s modernization done with care - improving performance and reliability without disrupting the day-to-day flow of business.

Key Highlights:

• Tailored modernization strategies focused on preserving core business operations
• Emphasis on performance optimization and workflow automation
• Support for migration to cloud-based and hybrid infrastructures
• Focus on security compliance and risk management
• End-to-end modernization, from initial system audit to post-launch optimization

Services:

• Legacy system analysis and modernization planning
• Cloud migration and infrastructure transformation
• Workflow automation and process optimization
• Integration of legacy platforms with modern technologies
• Security upgrades and compliance alignment
• Continuous support and system monitoring after modernization

Contact Information:

• Website: applicationmodernization.services
• E-mail: info@applicationmodernization.services
• Facebook: www.facebook.com/tkxelofficial
• Instagram: www.instagram.com/tkxelofficial
• Phone: (571) 549-8430

Conclusion

Wrapping up, legacy system modernization isn’t just about swapping old code for new tech - it’s about setting up a foundation that actually fits how businesses work today. The companies shaping this field in the U.S. understand that modernization needs to go deeper than technology; it’s about improving reliability, speed, and adaptability without losing the business logic that’s been built over years. Each provider brings its own approach, but they all share a focus on making transitions smoother and systems more future-ready.

For many organizations, the real value of modernization shows up quietly - fewer system hiccups, faster updates, better security, and teams that can finally focus on innovation instead of maintenance. It’s not a flashy transformation, but it’s one that pays off every single day. Whether a company chooses a full rebuild or gradual migration, the goal is the same: to keep pace with change while holding onto what works. In that sense, modernization isn’t an endpoint at all - it’s an ongoing process of keeping technology aligned with where the business wants to go next.