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

Yellowchalk Design
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Yellowchalk is a well-regarded boutique UI/UX design studio based in Bangalore, with an additional office in Singapore. The firm has served over 100 satisfied clients worldwide and collaborated with leading multinationals such as EY, Intel, Changi Airport, Titan, and Vidal Health, as well as innovat
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Bengaluru, Karnataka, In
Services Provided+2 Services
14% Mobile App Development (iOS & Android)
13% E-Commerce Development
7% Legacy System Modernization
33% Product UX Strategy
AI Summary
“Yellowchalk Design is a boutique UI/UX studio delivering functional, responsive digital products and brand identities, serving global clients from startups to multinationals with creative design solutions.”
Adintelo
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Enhance your projects with high-quality engineering development. Adintelo has established itself as one of the leading brands in Colombia and Australia, recognized for its commitment and professionalism in high-impact projects. The company has supported the growth of both multinational projects and
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Medellin, Antioquia, Co
Services Provided+5 Services
8% Legacy System Modernization
7% Frontend Development
7% Backend Development
7% Custom Web Application Development
AI Summary
“Adintelo delivers innovative software development, AI-driven automation, and robust IT infrastructure solutions, supporting digital transformation with expert teams and modernized, secure applications globally.”
Fraction Tech
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At Fraction Tech, we develop web and mobile applications with a focus on user-friendly design, adaptable development, and a highly scalable infrastructure. We collaborate closely with various companies to help them realize their goals through our quality services, including enterprise-level solution
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Ahmedabad, Gujarat, In
Services Provided
35% Mobile App Development (iOS & Android)
35% Custom Web Application Development
20% E-Commerce Development
10% Legacy System Modernization
AI Summary
“Fraction Tech delivers scalable, user-friendly web and mobile applications with enterprise-grade solutions across diverse industries, leveraging over a decade of expertise in custom software development and system integration.”
SlovShore US LLC
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SlovShore is an innovative company that creates and provides technology-driven services to assist our clients in enhancing their businesses. We offer a comprehensive suite of services by utilizing our industry knowledge and strategic partnerships with top technology firms. Our expertise in nearshore
Highlights
$50,000+
Min Project Size
50-249
Employees
Nashua, New Hampshire, Us
Services Provided+4 Services
50% Other IT Consulting and SI
17% Software Development Services
8% Legacy System Modernization
5% QA & Software Testing
AI Summary
“SlovShore offers technology-driven nearshore outsourcing services, aligning resources with business strategies to deliver reliable, cost-efficient solutions that enhance performance, security, and innovation.”
Headspring
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We are a bespoke software engineering and consulting company. Our range of solutions—from application development and enterprise architecture to complete system modernization—helps you accelerate operations, improve efficiency, and differentiate yourself in a dynamic market. As your partners, we tak
Highlights
$50-99/hr
Avg Hourly Rate
50-249
Employees
Austin, Texas, Us
Services Provided+6 Services
4% ERP & CRM Development
5% API Development & Integration
5% Mobile App Development (iOS & Android)
10% Legacy System Modernization
AI Summary
“Headspring is a bespoke software engineering and consulting firm delivering tailored application development, enterprise architecture, and system modernization to enhance operational efficiency and competitiveness.”
Journeyhorizon
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We might just be the top Sharetribe Flex developers globally! While that’s a bold statement, our experience and team capabilities back it up. Over the years, we’ve tackled almost every aspect of creating online marketplaces on Sharetribe Flex. Developing a product is a continuous journey, and since
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Services Provided+1 Services
30% Custom Web Application Development
25% Mobile App Development (iOS & Android)
20% E-Commerce Development
10% Blockchain & Web3 Development
AI Summary
“Journeyhorizon is an Australian-Vietnamese software firm specializing in Sharetribe Flex marketplace development, mobile and web applications, and e-learning solutions, emphasizing quality and strong client collaboration.”
GRPLabs
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GRPLabs is a leading IT outsourcing company focused on blockchain, web3, and cryptocurrency projects. With extensive experience in developing and implementing a variety of solutions such as decentralized exchanges (DEXs), centralized exchanges (CEXs), DeFi protocols, Play2Earn models, yield protocol
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided
70% Blockchain & Web3 Development
10% Mobile App Development (iOS & Android)
10% E-Commerce Development
10% Legacy System Modernization
AI Summary
“GRPLabs is a leading IT outsourcing firm specializing in blockchain, web3, cryptocurrency, and innovative software development, delivering tailored blockchain, mobile, and enterprise app solutions globally.”
Mantrax Software Solutions
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Mantrax Software Solutions is a prominent app development firm located in Toronto. Our team of developers and consultants employs an agile software methodology for your app development needs. Project managers communicate with both the client and the internal development team to guarantee that we mee
Highlights
$10,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Toronto, Ontario, Ca
Services Provided+4 Services
8% Custom Web Application Development
8% Mobile App Development (iOS & Android)
2% E-Commerce Development
10% Backend Development
AI Summary
“Mantrax Software Solutions, based in Toronto, specializes in agile app development, custom software, cloud solutions, and progressive web apps, ensuring transparent communication and timely project delivery.”
iTech4Web
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Information on iTech4Web Located in Chicago, USA, iTech4Web boasts a skilled delivery team across the USA and Europe. We focus on providing complete turnkey solutions for web development and CMS projects, which encompass comprehensive UI/UX design customized for businesses and organizations. Our
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Lisle, Illinois, Us
Services Provided+2 Services
23% Custom Web Application Development
13% API Development & Integration
7% Progressive Web App (PWA) Development
7% Legacy System Modernization
AI Summary
“iTech4Web, headquartered in Chicago with teams across the USA and Europe, delivers turnkey web development and CMS solutions featuring customized UI/UX design using technologies like Drupal, WordPress, PHP, and React.”
GreatoDeal
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Greatodeal is an international company that offers AI automation and IT services, focusing on websites, mobile applications, ERP systems, and AI-driven SaaS solutions. We create scalable, secure, and high-performance digital products tailored for startups, small and medium-sized enterprises, and lar
Highlights
$50,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Amsterdam, North Holland, Nl
Services Provided+2 Services
7% Legacy System Modernization
10% Mobile App Development (iOS & Android)
17% Custom Web Application Development
33% DevOps Engineering
AI Summary
“GreatoDeal delivers AI automation, custom software, ERP, and cloud solutions, creating scalable, secure digital products that enhance efficiency for businesses of all sizes worldwide.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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