Top Legacy System Modernization Firms

Many core systems still run on COBOL, Visual Basic, old .NET or Java monoliths that few engineers can maintain and that cannot connect to modern tools. Legacy system modernization companies replace or rework them without stopping the business: they assess the codebase, choose between rehosting, refactoring, rearchitecting and rebuilding, then migrate data and users in stages. Companies hire them when vendors end support, when the last developer who knows the system is retiring, when security audits flag unsupported software, or when a new product needs APIs the old system cannot offer.

Compare the firms here on modernizations of your specific technology and on how they keep the old and new systems running side by side during the switch.

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4,482 Companies

List of the Best Legacy System Modernization Agencies

Zero Down Time Ltd
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ZDT is a prominent provider of IT Outsourcing Services across North America, as well as Central and Eastern Europe. We assist Fortune 500 companies in relocating their operations to Eastern Europe. With an award-winning team and a commitment to ongoing skill development in emerging technologies, we
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Sofia, Sofia, Bg
Services Provided+7 Services
35% Custom Web Application Development
15% Legacy System Modernization
8% AI Strategy & Roadmap Consulting
8% Machine Learning Model Development
AI Summary
“Zero Down Time Ltd delivers custom software development, AI-driven automation, and IT outsourcing services with a focus on innovation, legacy modernization, and strategic consulting for global clients.”
R-Szoft Ltd.
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Our goal is to assist clients in digitalizing their corporate processes through tailored software solutions. We believe that successful digital transformation hinges not just on technology, but on enhancing collaboration among businesses, customers, and suppliers through new digital workflows. To ac
Highlights
$25,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Budapest, Budapest, Hu
Services Provided
60% Custom Web Application Development
20% Cloud Consulting & SI
10% Legacy System Modernization
10% Other IT Consulting and SI
AI Summary
“R-Szoft Ltd. specializes in custom software development, cloud consulting, and digital transformation, leveraging open-source technologies and cloud platforms to modernize enterprise applications across industries.”
Web Bespokers
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Web Bespokers is a comprehensive software development firm that specializes in creating valuable web applications and solutions, leveraging advanced technologies to enhance business processes. We collaborate with agencies, startups, established companies, and top brands globally across North America
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided+3 Services
40% Custom Web Application Development
30% Software Development Services
10% Legacy System Modernization
5% Other IT Consulting and SI
AI Summary
“Web Bespokers offers comprehensive software development services worldwide, specializing in advanced web applications, Agile practices, and full lifecycle support for diverse businesses and top brands.”
Teratis Solutions GmbH
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Teratis Solutions | Hochwertige Software- und IT-Dienstleistungen Wir unterstützen anspruchsvolle Unternehmen mit nachhaltigen und stabilen Software-Lösungen, die nicht nur die gegenwärtigen Bedürfnisse erfüllen, sondern auch langfristigen Erfolg gewährleisten und neue Geschäftschancen schaffen.
Highlights
$10,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Hamburg, Hamburg, De
Services Provided+2 Services
35% Custom Web Application Development
15% Legacy System Modernization
15% AI Strategy & Roadmap Consulting
13% BI & Big Data Consulting & SI
AI Summary
“Teratis Solutions GmbH delivers sustainable, high-quality software and IT services, enabling businesses to address current needs, ensure long-term success, and explore new opportunities.”
Truscable
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Truscable offers Product Engineering, Customized Software Solutions, and Application Modernization Services with an emphasis on return on investment (ROI). As a founder-led organization with over 20 years of experience, we excel in creating robust, scalable, and secure enterprise-grade platforms fro
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Bengaluru, Karnataka, In
Services Provided+2 Services
25% Custom Web Application Development
10% Mobile App Development (iOS & Android)
15% Legacy System Modernization
13% IT Staff Augmentation
AI Summary
“Truscable, a founder-led firm with 20+ years' experience, delivers product engineering, customized software solutions, and application modernization focusing on scalable, secure, and ROI-driven enterprise platforms.”
Techbar
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TechBar serves as an engineering partner for small, medium, and large businesses looking to develop or enhance a high-performing team, whether that entails constructing a full team from scratch or providing senior engineers who can integrate immediately. Our focus is on the key elements of your busi
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Strovolos, Nicosia, Cy
Services Provided+4 Services
14% Machine Learning Model Development
14% IT Staff Augmentation
3% AI Strategy & Roadmap Consulting
3% AI Agent & Multi-Agent System Development
AI Summary
“TechBar partners with businesses to provide tailored engineering solutions including staff augmentation, cloud engineering, and software development across various industries, leveraging a large remote team for scalable, high-quality delivery.”
Neotech Solutions
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We prioritize our business partners' requirement to build their market presence using our leading IT solutions. Each client is matched with an experienced software development team that aligns with their objectives, promoting effective communication and streamlined processes. Delivering state-of-the
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Beograd, Belgrade, Rs
Services Provided+1 Services
22% Custom Web Application Development
12% Legacy System Modernization
20% Cloud Consulting & SI
13% Other IT Consulting and SI
AI Summary
“Neotech Solutions delivers tailored software development, cloud consulting, and managed IT services, enabling innovative, efficient technology transformations aligned with clients' strategic objectives.”
Orafox, Inc.
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Orafox is a mobile and web application development firm located in Los Angeles that ensures flawless outcomes with peace of mind across all of our services. We focus on developing apps from the ground up and creating MVPs that reflect our clients’ perspectives, allowing us to design tailored solutio
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided+2 Services
20% Mobile App Development (iOS & Android)
20% Product Design
20% Custom Web Application Development
15% Legacy System Modernization
AI Summary
“Orafox, Inc. specializes in mobile and web app development, UI/UX design, and enterprise modernization, delivering tailored, scalable digital solutions and fostering long-term client partnerships.”
XDuce
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Established in 2006 and based in New Jersey, XDuce is an international provider of enterprise application development and consulting services. We create strong, scalable, and secure applications for major enterprises, small to medium-sized businesses, and independent software vendors (ISVs). XDuce h
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
250-999
Employees
Edison, New Jersey, Us
Services Provided
50% Custom Web Application Development
25% Mobile App Development (iOS & Android)
15% QA & Software Testing
10% Legacy System Modernization
AI Summary
“Founded in 2006, XDuce delivers scalable, secure enterprise application development, modernization, and consulting services across industries, supporting digital transformation for diverse business clients globally.”
CEI
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Established in 1992, CEI is a partner in AI engineering and transformation that develops, implements, and manages production-grade AI systems across various enterprise infrastructures. We assist organizations in transitioning from ambitions to actionable results by integrating AI into critical platf
Highlights
$50,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
1000-9999
Employees
Pittsburgh, Pennsylvania, Us
Services Provided+4 Services
10% Custom AI Chatbot Development
12% Machine Learning Model Development
3% CRM Consulting and SI
8% AI Strategy & Roadmap Consulting
AI Summary
“Founded in 1992, CEI partners with enterprises to design and implement scalable, secure AI systems, enabling operational modernization and measurable performance improvements globally.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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