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

SourceCodeStudio
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SourceCodeStudio is a boutique software development agency that focuses on creating custom solutions for medium to large enterprises. We provide scalable and innovative software designed to address real-world problems, helping businesses across various sectors enhance operations, adopt digital trans
Highlights
$10,000+
Min Project Size
10-49
Employees
Services Provided+1 Services
25% Custom Web Application Development
18% Mobile App Development (iOS & Android)
8% Legacy System Modernization
32% Product UX Strategy
AI Summary
“SourceCodeStudio is a boutique agency specializing in custom software development, AI, IoT, and workflow automation, partnering closely with enterprises to deliver scalable, innovative business solutions.”
TATOS Technologies Pvt Ltd
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TATOS Technologies Pvt Ltd is a modern digital service provider well-versed in a variety of emerging technologies. We assist you in finding solutions across several sectors, including SaaS, Fintech, Real Estate, Healthcare, Education, and Renewable Energy, among others. As your partner, we recognize
Highlights
$10,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Thiruvananthapuram, Kerala, In
Services Provided+4 Services
30% Mobile App Development (iOS & Android)
20% Custom Web Application Development
15% Internet of Things Services
10% Software Development Services
AI Summary
“TATOS Technologies Pvt Ltd delivers innovative digital solutions across sectors using emerging technologies like mobile and web development, IoT, and digital marketing, supporting clients from concept to launch.”
Technologist
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Technologist is a group of passionate professionals dedicated to transforming your ideas with a commitment to ownership and complete transparency. We specialize in web, mobile, and enterprise software development. Recently, we have completed several projects, including: - A comprehensive retail lo
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Yerevan, Am
Services Provided+1 Services
30% Custom Web Application Development
30% Mobile App Development (iOS & Android)
15% Backend Development
15% Frontend Development
AI Summary
“Technologist specializes in custom web, mobile, and enterprise software development, delivering solutions like legacy modernization, loyalty programs, and AI-driven automation with full product ownership.”
Edsson
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At Edsson, we merge the expertise of highly skilled engineers with extensive software development to create systems that are ready for the future. Our knowledge covers various industries, including finance, healthcare, logistics, and more. We prioritize building enduring partnerships with our client
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Kyiv, Ua
Services Provided+11 Services
8% Legacy System Modernization
3% E-Commerce Development
15% Custom Web Application Development
1% MLOps & Model Deployment Infrastructure
AI Summary
“Edsson combines expert engineering and software development across industries like finance and healthcare, delivering tailored, innovative solutions and ongoing support to drive technological advancement.”
ALTEREGO WEB
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Innovative, technological, and practical solutions for all types of online services and applications centered around the Internet. Your partner for sourcing.
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Vilafant, Es
Services Provided+1 Services
23% Custom Web Application Development
13% E-Commerce Development
7% Legacy System Modernization
7% Blockchain & Web3 Development
AI Summary
“ALTEREGO WEB delivers innovative, technological, and practical online service solutions, specializing in Internet-based applications and sourcing partnerships to support diverse business needs.”
ICT Information Technologies
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Founded in 2005, ICT Information Technologies focuses on conducting R&D activities as of 2010 and has relocated to the Technopark in Istanbul, Turkey, where it provides both software and consultancy services. At ICT, we offer specialized software development tailored to the internal processes of org
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided
60% Custom Web Application Development
30% Mobile App Development (iOS & Android)
10% Legacy System Modernization
AI Summary
“Founded in 2005 and based in Istanbul's Technopark, ICT Information Technologies specializes in tailored software development and consultancy, focusing on research, development, and client-specific projects.”
jCor
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Founded in 2011, jCor is a software development company focused on creating Web Applications using cutting-edge technologies to ensure both robustness and security. We implement processes and methodologies designed to produce high-quality code, enabling us to meet deadlines consistently. The collect
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided
60% Custom Web Application Development
30% Mobile App Development (iOS & Android)
10% Legacy System Modernization
AI Summary
“Founded in 2011, jCor specializes in developing robust, secure web applications using advanced technologies and methodologies, delivering high-quality code on time through expert teamwork.”
Swordmonkey Studios Inc.
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Swordmonkey Studios Inc. is a comprehensive interactive media and software development firm located in Alberta, Canada. We operate primarily remotely and are open to various technologies, offering a wide range of services that include art direction, video game console porting, game development, ente
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Edmonton, Alberta, Ca
Services Provided+4 Services
25% Custom Web Application Development
18% Mobile App Development (iOS & Android)
7% Legacy System Modernization
10% Product UX Strategy
AI Summary
“Swordmonkey Studios Inc., based in Alberta, Canada, delivers innovative software and interactive media solutions, specializing in custom development, AR/VR, UI/UX design, and game development across diverse platforms.”
Simple Solutions
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Assisting businesses in leveraging the advantages of the digital landscape, Simple Solutions is a company specializing in software development and digital transformation.
Highlights
$100,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Novi Sad, Rs
Services Provided+1 Services
35% Custom Web Application Development
25% Backend Development
20% Frontend Development
10% Legacy System Modernization
AI Summary
“Simple Solutions specializes in software development and digital transformation, helping businesses harness digital technologies to improve operations and achieve strategic growth.”
ITCube Solutions Pvt. Ltd.
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ITCube is a worldwide provider of technology services, consulting, and software development, with a presence in various countries through its offices, clients, and partners. We specialize in delivering high-quality, robust, end-to-end custom software solutions that help our clients gain a competitiv
Highlights
$25,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
250-999
Employees
Cincinnati, Ohio, Us
Services Provided+1 Services
20% Custom Web Application Development
15% Mobile App Development (iOS & Android)
10% QA & Software Testing
5% Legacy System Modernization
AI Summary
“ITCube Solutions Pvt. Ltd. delivers global technology services and custom software development, specializing in Microsoft platforms, BI, AI, IoT, and digital transformation to drive client growth.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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