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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We evaluate companies on verified profile data: services, pricing, locations, and portfolio. Client reviews are being collected. We may earn a fee for some placements. How we rank and verify

4,482 Companies

List of the Best Legacy System Modernization Agencies

SO LEAN IT
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An experienced freelance developer with over 17 years of practical expertise in developing web backends. I assist product teams in designing, improving, and delivering backends and APIs using PHP/Symfony and TypeScript/Node.js. My specialties include hexagonal architecture, Domain-Driven Design, and
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
Strasbourg, Grand Est, Fr
Services Provided
20% Legacy System Modernization
20% Backend Development
10% API Development & Integration
50% Cloud Consulting & SI
AI Summary
“SO LEAN IT is a freelance developer with 17+ years' experience, specializing in web backend and API development using PHP/Symfony and TypeScript/Node.js, focusing on architecture and legacy modernization.”
digitalisation.team
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We are a company specializing in IT consulting and software development, offering services to help digitize your business processes and manufacturing operations. Our focus includes trends in Industry 4.0 and Smart Cities, encompassing both hardware and software design, as well as data science. We ta
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Poznan, Greater Poland, Pl
Services Provided+1 Services
15% Mobile App Development (iOS & Android)
20% Legacy System Modernization
15% Custom Web Application Development
40% BI & Big Data Consulting & SI
AI Summary
“digitalisation.team provides comprehensive IT consulting and software development services, specializing in Industry 4.0, Smart Cities, hardware and software design, and data science, guiding projects from concept to implementation.”
PAIDNINJAS SOFTWARE & IT SOLUTIONS
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PAIDNINJAS SOFTWARE & IT SOLUTIONS is a leading provider of high-quality Fullstack engineering services, focusing on contemporary web technologies. Our expert team specializes in JavaScript and TypeScript to develop resilient, scalable, and high-performance applications. We provide extensive support
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Ahmedabad, Gujarat, In
Services Provided
85% Custom Web Application Development
10% Other IT Consulting and SI
5% Legacy System Modernization
AI Summary
“PAIDNINJAS SOFTWARE & IT SOLUTIONS delivers expert full-stack development using modern web technologies, offering scalable applications, cloud infrastructure, and DevOps services to meet diverse client needs.”
Cirrius Solutions
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Cirrius Solutions is a worldwide provider of Salesforce.com technology services, boasting more than 250 successful Salesforce implementations globally. Our clients vary in size and span multiple industries, including high-tech, professional services, distribution, and retail. Rapidly growing compani
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Plymouth, Minnesota, Us
Services Provided+2 Services
3% IT Staff Augmentation
27% CRM Consulting and SI
3% Other IT Consulting and SI
14% Legacy System Modernization
AI Summary
“Cirrius Solutions delivers global Salesforce technology services, including consulting, implementation, and development, enabling diverse industries to enhance customer engagement and accelerate business growth.”
CodeTrade India Pvt. Ltd.
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CodeTrade.io is a reliable technology partner that provides scalable ERP, LMS, AI, and tailored software solutions. Holding a CMMI Level 3 certification and recognized as an Official Odoo Partner and Official Open edX Partner, we apply rigorous engineering practices and deep business understanding t
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
50-249
Employees
Ahmedabad, Gujarat, In
Services Provided+6 Services
7% E-Commerce Development
7% Mobile App Development (iOS & Android)
20% Legacy System Modernization
8% Custom AI Chatbot Development
AI Summary
“CodeTrade India Pvt. Ltd. delivers scalable ERP, LMS, AI, and custom software solutions with certified expertise, enabling process automation and advanced digital transformation across industries.”
Hire Mobile Developers
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At HireMobileDevelopers, we lead the way in technological innovation, focusing on customizing web and mobile app solutions to address various business needs. Whether we’re working with emerging startups or well-established industry giants, our dedication is steadfast: to provide exceptional and cost
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Services Provided
70% Mobile App Development (iOS & Android)
15% Legacy System Modernization
15% QA & Software Testing
AI Summary
“HireMobileDevelopers specializes in delivering customized web and mobile app solutions, serving startups to industry leaders with cost-effective and innovative technology services that enhance client success.”
minicode
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Need a cloud application that leverages data? Struggling with outdated, cumbersome data? Worried about cybersecurity risks? Seeking a partner for product development? We're here for you. Since 2011, we have dedicated ourselves to providing tailor-made software and data analytics solutions for small
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Brisbane City, Queensland, Au
Services Provided
55% Custom Web Application Development
30% API Development & Integration
15% Legacy System Modernization
AI Summary
“Since 2011, Minicode delivers custom software and data analytics solutions, helping small to medium businesses modernize data management, enhance cybersecurity, and support product development.”
head GmbH
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We are your all-in-one coding solution for Germany's top agencies. We are industry insiders who understand the landscape. We aim to transform coding practices in Germany. We are here to drive digital progress alongside you. Your satisfaction is our priority, and we’re available even at 2 am. We are
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Cologne, North Rhine Westphalia, De
Services Provided
50% Custom Web Application Development
30% E-Commerce Development
20% Legacy System Modernization
AI Summary
“head GmbH provides comprehensive coding solutions tailored for Germany’s leading agencies, leveraging industry insight to advance digital progress with dedicated, around-the-clock support.”
Share IT
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Share IT is a comprehensive software development company that focuses on creating exceptional web and mobile technology solutions aimed at helping businesses of all sizes improve their workflows, boost productivity, and enhance customer experiences. We offer a complete range of IT services, from con
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Tullamore, Ie
Services Provided
55% Custom Web Application Development
35% Mobile App Development (iOS & Android)
10% Legacy System Modernization
AI Summary
“Share IT is a seasoned software development firm delivering end-to-end web and mobile solutions, leveraging diverse technologies to enhance business workflows, productivity, and digital transformation globally.”
LinkingLogics.com
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LinkingLogics.com is the newly established development branch of BlackDog Logics. Founded in 1980, BlackDog Logics was among the pioneers in utilizing groundbreaking technologies like home computing (laptops), enhancing data connectivity and social networking for the recruitment sector. They are now
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Loveland, Colorado, Us
Services Provided+1 Services
20% Software Development Services
20% Legacy System Modernization
20% IT Staff Augmentation
20% Mobile App Development (iOS & Android)
AI Summary
“LinkingLogics.com, the development arm of BlackDog Logics, specializes in custom software, web, and mobile app development, leveraging disruptive technologies and cloud platforms to deliver innovative, reliable, and scalable solutions.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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