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

ThinkWeb
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For more than 17 years, we have been a reliable software development partner for businesses across the USA, Canada, Singapore, Australia, France, Germany, Denmark, Belgium, and Eastern Europe. Our portfolio, featuring over 140 successful projects, highlights our proficiency in creating custom web ap
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Sofia, Sofia, Bg
Services Provided+6 Services
17% Custom Web Application Development
7% E-Commerce Development
7% API Development & Integration
3% Legacy System Modernization
AI Summary
“ThinkWeb is a trusted European software development partner since 2009, delivering secure, custom web applications across industries with a focus on security, quality, and digital transformation.”
Valor Software
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Since its founding in 2013, Valor Software has distinguished itself in providing expert consulting and developing software engineering products. We support engineering leaders in achieving their objectives by leveraging our expertise, customizing technology, and employing the knowledge gained from y
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Lakewood, Colorado, Us
Services Provided+24 Services
1% ERP & CRM Development
2% QA & Software Testing
2% Mobile App Development (iOS & Android)
1% CMS Development & Customization
AI Summary
“Founded in 2013, Valor Software delivers expert consulting and custom software engineering, leveraging open-source expertise to provide innovative, reliable solutions that empower engineering and business leaders globally.”
Keypoint Solutions Ltd
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Our skilled team manages every stage of professional software projects from inception to completion. Leveraging our existing software network and development expertise, we can take on consultancy projects and secure necessary resources. We specialize in delivering software training and recruitment s
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
London, England, Gb
Services Provided+4 Services
15% Mobile App Development (iOS & Android)
5% Legacy System Modernization
14% Custom Web Application Development
20% Cloud Consulting & SI
AI Summary
“Keypoint Solutions Ltd delivers expert software development, AI integration, and IT infrastructure services, supported by extensive training, recruitment, and consulting resources across UK and Europe.”
New Phase Solutions
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New Phase Solutions (NPS) is a consulting-focused digital transformation firm located in South Africa, providing cutting-edge solutions that integrate business strategy, technology, and AI-powered tools. Our expertise lies in digital transformation consulting, optimizing business processes, AI and a
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+14 Services
10% Digital Strategy
10% Other IT Consulting and SI
5% AI Agent & Multi-Agent System Development
5% AI Strategy & Roadmap Consulting
AI Summary
“New Phase Solutions specializes in Software Development through services like E-Commerce Development and Mobile App Development, enabling clients to modernize their digital platforms and enhance customer engagement.”
Sofort Solutions UK
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Sofort Solutions UK is a company specializing in software and mobile app development, assisting small businesses in discovering and creating innovative business solutions through advanced technology. We create, launch, and support database systems, mobile-responsive websites, cloud-based application
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
250-999
Employees
Services Provided+4 Services
13% Mobile App Development (iOS & Android)
12% Custom Web Application Development
3% E-Commerce Development
2% Legacy System Modernization
AI Summary
“Sofort Solutions UK develops software and mobile apps, delivering cloud-based systems and responsive platforms to empower small businesses with innovative technology solutions.”
CITROK
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Citrok is a leading software innovation company located in the USA. We provide our clients and partners with top-notch and cutting-edge software technologies. With more than a decade of experience in web app development, UI/UX design, and product development, we specialize in offering high-quality d
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Services Provided+10 Services
10% Custom Web Application Development
3% E-Commerce Development
2% Legacy System Modernization
3% QA & Software Testing
AI Summary
“CITROK is a US-based software innovation firm delivering custom web applications, UI/UX design, e-commerce platforms, and IT consulting to enhance digital transformation and operational efficiency.”
Enterprise Innovation Consulting
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**Our Foundation and Methodology** Enterprise Innovation Consulting (EIC) was founded in 2016 as a company focused on software staffing and outsourcing, utilizing modern development techniques such as microservices and DevOps. In 2022, the company redirected its efforts toward providing consulting
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Tucson, Arizona, Us
Services Provided+10 Services
9% SaaS Product Development
9% Custom Web Application Development
5% API Development & Integration
3% Legacy System Modernization
AI Summary
“Enterprise Innovation Consulting specializes in AI-driven software development, applying standardized Software Factory principles to enhance productivity, scalability, and operational readiness across client workflows.”
Mynteo
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Mynteo offers outsourced software development assistance for enterprise projects, enabling teams to boost their capacity without the additional burden of recruitment. Our expertise lies in web applications, both frontend and backend development, mobile application assistance, and continuous system m
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Bratislava, Bratislava, Sk
Services Provided+3 Services
25% Custom Web Application Development
20% Mobile App Development (iOS & Android)
15% API Development & Integration
5% E-Commerce Development
AI Summary
“Mynteo provides outsourced software development, specializing in web and mobile applications, enabling enterprises to enhance team capacity with reliable, seamless integration and continuous maintenance support.”
Sitline
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We are a company specializing in comprehensive solutions in Finance, Highway Traffic Management, B2B eCommerce, and Manufacturing. Sitline’s IT division supports our Industrial Automation department.
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Cluj-Napoca, Cluj, Ro
Services Provided+4 Services
6% Legacy System Modernization
9% Custom Web Application Development
10% E-Commerce Development
25% Product Design
AI Summary
“Sitline delivers comprehensive solutions across Finance, Highway Traffic Management, B2B eCommerce, and Manufacturing, supported by a robust IT division specializing in Industrial Automation.”
Programium
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Programium is a specialized technical consultancy that serves as a proactive tech partner for businesses looking to grow and innovate. We tackle intricate business challenges by offering comprehensive digital solutions, from conceptualization to implementation. Our guiding principle is close collabo
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Lodz, Lodz, Pl
Services Provided+7 Services
20% Custom Web Application Development
15% API Development & Integration
10% Blockchain & Web3 Development
5% Legacy System Modernization
AI Summary
“Programium is a technical consultancy delivering custom software, AI, data engineering, and Web3 solutions. They focus on scalable, secure systems through expert collaboration and full development lifecycle support.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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