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

Elysium Ltd
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Elysium: The Reliable Leader in Enterprise Software, AI Development, and Sovereign Hosting Engineering since 1991. In an industry filled with AI-driven agencies and rapid prototyping services, Elysium provides something unique: experienced engineers who have successfully delivered production softwar
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Crowborough, England, Gb
Services Provided+1 Services
22% Custom Web Application Development
12% Legacy System Modernization
33% DevOps Engineering
23% AI Agent & Multi-Agent System Development
AI Summary
“Elysium Ltd. specializes in enterprise software, AI development, and sovereign hosting with experienced engineers, offering scalable, secure solutions including legacy modernisation and AI-powered infrastructure since 1991.”
ISHIR
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We assist leaders in AI-driven organizations by simplifying complex decisions and leveraging AI for tangible business benefits. Our approach combines strategic insight, digital product innovation, and expertise in AI engineering. We emphasize transformation across people, processes, products, and pl
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Dallas, Texas, Us
Services Provided+4 Services
30% Custom Web Application Development
13% Mobile App Development (iOS & Android)
8% Legacy System Modernization
15% AI Agent & Multi-Agent System Development
AI Summary
“ISHIR is a Dallas-based AI-native digital product innovation studio offering custom AI-driven software, data strategy, and global talent solutions to transform businesses and accelerate value delivery.”
hotswap
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Hotswap is a company focused on creating tailored web-based management applications. Our expertise includes data integration, SaaS integration, e-commerce development, as well as partnerships and maintenance services. We aim to innovate and deliver continually updated solutions that provide user-fri
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Poggio Mirteto, It
Services Provided
50% Custom Web Application Development
40% E-Commerce Development
10% Legacy System Modernization
AI Summary
“Hotswap specializes in developing tailored web-based management applications, offering data integration, SaaS and e-commerce solutions, alongside partnerships and ongoing maintenance services.”
Xenio
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We are a software company that employs an extensive range of technologies to create mobile and web products. Our primary objective is to assist you in bringing your idea to life. What sets us apart from others? Simply put, everything!
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Punta del Este, Maldonado, Uy
Services Provided
40% Mobile App Development (iOS & Android)
50% Custom Web Application Development
10% Legacy System Modernization
AI Summary
“Xenio is a versatile software company specializing in mobile and web product development, leveraging diverse technologies to transform ideas into innovative digital solutions.”
KitelyTech
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KitelyTech is an AI product engineering company that specializes in developing intelligent software platforms, machine learning systems, and generative AI applications for both startups and enterprises. As a comprehensive technology consulting and software development firm, KitelyTech assists organi
Highlights
$25,000+
Min Project Size
$150+/hr
Avg Hourly Rate
50-249
Employees
Chicago, Illinois, Us
Services Provided+6 Services
8% AI Strategy & Roadmap Consulting
7% LLM Integration & Prompt Engineering
5% Custom AI Chatbot Development
10% Machine Learning Model Development
AI Summary
“KitelyTech is an AI-driven product engineering firm providing end-to-end digital transformation, software development, and consulting services to startups and enterprises, enhancing efficiency and innovation.”
AKDev Group
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At AKDev Group, we develop impactful IT solutions designed to help businesses grow, optimize, and innovate. Since 2017, we've successfully completed over 60 projects in the US, EU, Canada, UAE, and elsewhere, collaborating with startups and small to medium-sized businesses to realize new ideas and e
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Tbilisi, Tbilisi, Ge
Services Provided+3 Services
25% Custom Web Application Development
20% Mobile App Development (iOS & Android)
15% API Development & Integration
15% Backend Development
AI Summary
“AKDev Group delivers scalable, high-performance IT solutions since 2017, serving diverse industries globally with software development, optimization, and Agile support, ensuring lasting client partnerships and growth.”
Crucial App Concepts, Inc.
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Crucial App Concepts is a comprehensive provider of mobile and software solutions. As digital strategists, we assist businesses ranging from startups to international corporations by addressing their specific needs with tailored mobile strategies, complete software solutions, and a committed support
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Katy, Texas, Us
Services Provided
50% Mobile App Development (iOS & Android)
40% Custom Web Application Development
10% Legacy System Modernization
AI Summary
“Crucial App Concepts delivers tailored mobile and software solutions with end-to-end services including development, design, and support, helping businesses achieve their digital objectives effectively.”
Weblogiko
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We offer Software Engineering and Data Services to clients around the globe, utilizing agile methodologies to produce top-notch code, reports, and systems. Located in Brazil, we can align our working hours with companies in North America and Western Europe.
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Balneario Camboriu, Santa Catarina, Br
Services Provided
50% Custom Web Application Development
40% API Development & Integration
10% Legacy System Modernization
AI Summary
“Weblogiko delivers agile software engineering and data services globally, providing high-quality code and reports while aligning work hours with North American and Western European clients.”
Nodku
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We are a contemporary software company with a talented team. We utilize cutting-edge technologies such as Node.js, React.js, and React Native for mobile development.
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
San Salvador de Jujuy, Jujuy, Ar
Services Provided
40% Mobile App Development (iOS & Android)
50% Custom Web Application Development
10% Legacy System Modernization
AI Summary
“Nodku is a contemporary software company specializing in modern technologies like Node.js, React.js, and React Native, delivering innovative web and mobile development solutions.”
ETT
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ETT is a software development and consulting company dedicated to delivering top-notch services to our clients. We focus on creating custom software and applications for virtual reality, web, mobile, and desktop platforms, in addition to offering complete software solutions through our SaaS products
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Scottsdale, Arizona, Us
Services Provided
40% Mobile App Development (iOS & Android)
50% Custom Web Application Development
10% Legacy System Modernization
AI Summary
“ETT delivers custom software, mobile, AR/VR, web, and desktop solutions, combining development, modernization, SaaS products, and content creation to enhance client engagement and skills.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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