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

Clicks & Code
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🚀 Comprehensive Digital Agency 💻 Specializing in Web, Mobile, SaaS, and CRM 📈 Digital Marketing, SEO, SMM, and Advertising 🤖 Offering Automation and AI solutions for smarter scalability.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
40% Custom Web Application Development
10% Legacy System Modernization
50% Search Engine Optimization (SEO)
AI Summary
“Clicks & Code is a comprehensive digital agency specializing in web, mobile, SaaS, CRM, digital marketing, SEO, SMM, advertising, as well as automation and AI solutions for scalable growth.”
Primaris Services
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As a medium-sized IT company, we are equipped to work with a range of technologies and can develop necessary skills as needed. Our broad network of collaborations with partners allows us to create complex, customized product and service offerings tailored to specific requirements. We aim to provide
Highlights
$100,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Warszawa, Masovian, Pl
Services Provided+2 Services
10% QA & Software Testing
10% Legacy System Modernization
14% Custom Web Application Development
20% BI & Big Data Consulting & SI
AI Summary
“Primaris Services is a medium-sized IT company delivering tailored, high-quality technology solutions through strong partnerships and versatile expertise, ensuring timely and customized service offerings.”
Mobilise App Lab Ltd
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We are a technology-oriented organization offering cutting-edge, process-oriented IT solutions designed to address intricate business issues. With a focus on web, mobile, and IoT applications, we enable businesses to achieve automation, enhance efficiency, and support scalable growth through our cus
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
50-249
Employees
Faridabad, Haryana, In
Services Provided
40% Custom Web Application Development
10% Legacy System Modernization
20% AI Model Fine-Tuning & Training
30% AI Strategy & Roadmap Consulting
AI Summary
“Mobilise App Lab Ltd. delivers advanced IT solutions across web, mobile, and IoT platforms, enabling automation and scalable business growth through customized, process-driven technologies.”
People10 Technologies Inc.
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People10 (www.people10.com) is a rapidly expanding leader in digital transformation and product engineering, operating in both the US and India. We assist enterprises and startups in developing customized solutions in artificial intelligence, machine learning, IoT, and web and mobile applications fo
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
250-999
Employees
New York, New York, Us
Services Provided+3 Services
13% Backend Development
3% Legacy System Modernization
10% Mobile App Development (iOS & Android)
2% ERP & CRM Development
AI Summary
“People10 Technologies Inc. delivers advanced digital transformation and product engineering services across AI, ML, IoT, and web/mobile applications, empowering enterprises with agile, innovative, and client-focused solutions.”
Lampora
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Lampora creates software solutions powered by AI that revolutionize businesses. We offer everything from tailored applications to smart automation, incorporating advanced AI, scalable architecture, and strategic innovation to assist companies in their growth—moving beyond mere digitization. 🚀
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided+3 Services
35% Custom Web Application Development
15% Legacy System Modernization
10% AI Strategy & Roadmap Consulting
10% Custom AI Chatbot Development
AI Summary
“Lampora develops advanced AI-powered software solutions that enable businesses to grow through tailored applications, smart automation, scalable architecture, and strategic innovation beyond simple digitization.”
Arrk Group
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Established 25 years ago in Manchester, UK, Arrk Group has experienced significant growth and has successfully opened branches in both the UK and India. Our mission at Arrk focuses on empowering businesses to succeed by creating flexible platforms that meet our clients' current and future demands in
Highlights
$50,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Manchester, England, Gb
Services Provided+5 Services
14% Custom Web Application Development
8% Mobile App Development (iOS & Android)
12% Legacy System Modernization
13% AI Strategy & Roadmap Consulting
AI Summary
“Arrk Group, with 25 years' experience, delivers AI-driven solutions in business intelligence, marketing, cloud migration, and digital automation, supporting global clients across public and private sectors.”
Chudovo
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Chudovo is a custom software development firm specializing in the implementation of complex systems. Our clients trust our expertise and value our transparency regarding timelines, budgets, work progress visibility, and support in meeting their business goals with high-quality solutions. Our teams a
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Castrop-Rauxel, De
Services Provided+6 Services
15% Custom Web Application Development
10% Mobile App Development (iOS & Android)
10% API Development & Integration
8% E-Commerce Development
AI Summary
“Chudovo is a reliable custom software development company delivering over 190 projects across multiple sectors, specializing in complex, innovative web, mobile, cloud, AI, and embedded solutions.”
Profinit
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Profinit is a prominent player in Custom Software Development, AI & Data Science, and Data Management. IDC Research has recognized it as the third largest custom application developer in the Czech Republic. The company is part of Amdocs, a worldwide leader in software and services tailored for commu
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
250-999
Employees
Prague, Cz
Services Provided+13 Services
25% Custom Web Application Development
8% Legacy System Modernization
7% Business Intelligence (BI) Dashboard Development
5% Data Warehouse Architecture
AI Summary
“Profinit specializes in custom software development, AI, data management, and IT outsourcing, serving major financial, telecom, and public sector clients across Central and Western Europe.”
Readcast
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Readcast assists large, medium-sized businesses, and startups in creating and developing products tailored to their specific requirements, bringing their ideas to fruition.
Highlights
$5,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Chisinau, Chisinau, Md
Services Provided+1 Services
30% Software Development Services
20% Mobile App Development (iOS & Android)
20% Product UX Strategy
20% Custom Web Application Development
AI Summary
“Readcast partners with businesses of all sizes to design and develop customized products, transforming client ideas into effective, tailored solutions.”
Freestyle Internet
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We enhance your website gradually, boosting your SEO, efficiency, and business growth. Your guide to moving from mere survival to genuine success. If you believe your website has the potential to benefit your business more but aren’t sure how, or if you find yourself slipping in rankings without und
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
Bedford, England, Gb
Services Provided+1 Services
20% Custom Web Application Development
20% CMS Development & Customization
10% Legacy System Modernization
40% Search Engine Optimization (SEO)
AI Summary
“Freestyle Internet offers expert website assessments and tailored strategies to improve SEO, efficiency, and business growth, providing clear roadmaps for transforming online presence effectively.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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