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

MOBIRYT TECHNOLOGIES
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We are a well-known mobile app development company located in India, the UK, and the UAE, equipped to combine cutting-edge technology with stunning designs to enhance the growth and visibility of startups and enterprises.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Jaipur, Rajasthan, In
Services Provided+5 Services
3% Custom Web Application Development
3% QA & Software Testing
2% Legacy System Modernization
22% Mobile App Development (iOS & Android)
AI Summary
“MOBIRYT TECHNOLOGIES is a mobile app development firm operating in India, the UK, and UAE, blending advanced technology with design to support startups and enterprises growth.”
adesso Turkey
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adesso Turkey was established in 2013 as a wholly-owned subsidiary of the Germany-based adesso Group, one of Europe’s leading IT service providers with a workforce of 10,000 across 12 countries. Serving as both a project house and a regional talent center, adesso Turkey provides tailored software de
Highlights
$75,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
250-999
Employees
Sariyer, Istanbul, Tr
Services Provided+9 Services
13% Custom Web Application Development
7% Mobile App Development (iOS & Android)
7% Cloud Consulting & SI
3% Legacy System Modernization
AI Summary
“adesso Turkey delivers comprehensive IT solutions including custom software, mobile apps, UX/UI design, and cloud consulting, leveraging global expertise to support diverse industries reliably.”
Stellar Stack Ltd
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StellarStack, based in Vancouver, BC, Canada, is a service-oriented team that provides high-quality, on-demand software solutions to brands in the Fortune 500 and beyond. We focus on advanced technologies, offering a range of services including cybersecurity management, iOS app development, blockcha
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Services Provided+10 Services
10% Custom Web Application Development
9% Mobile App Development (iOS & Android)
5% E-Commerce Development
1% Legacy System Modernization
AI Summary
“StellarStack Ltd. is a Vancouver-based technology firm delivering customized software, cybersecurity, blockchain, and digital solutions to global enterprises, emphasizing innovation, quality, and remote collaboration.”
Dynamicsoft Inc.
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Dynamicsoft is a software development firm located in Silicon Valley. We specialize in creating enterprise software, sophisticated web applications, and mobile applications. Our goal is to assist our clients in developing innovative services and solutions to enhance their business growth. To achieve
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Santa Clara, California, Us
Services Provided+5 Services
14% Custom Web Application Development
10% Mobile App Development (iOS & Android)
3% E-Commerce Development
5% Legacy System Modernization
AI Summary
“Dynamicsoft Inc. delivers enterprise software, web and mobile applications, UI/UX design, AI, blockchain, and e-commerce solutions, driving innovation and business growth for clients.”
Digital Wonderlab
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Digital Wonderlab is your endlessly inquisitive digital collaborator, recognized for our award-winning creation of websites, applications, and digital strategies that yield measurable results. As a Certified B Corporation, we blend strategy, design, technology, and AI to assist ambitious organizatio
Highlights
$100-149/hr
Avg Hourly Rate
10-49
Employees
Services Provided+5 Services
14% API Development & Integration
15% Mobile App Development (iOS & Android)
5% Legacy System Modernization
12% Product UX Strategy
AI Summary
“Digital Wonderlab is an award-winning digital collaborator specializing in websites, applications, and AI-driven strategies, helping ambitious organizations transform visions into measurable commercial success.”
NewRedo Ltd.
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NewRedo offers skilled IT consulting services and creates tailored software solutions for business clients. We handle every part of IT delivery, from design to live operation and support. Our lean and agile methodology minimizes risk by ensuring frequent deployment and collaboration with customers,
Highlights
$10,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Leeds, England, Gb
Services Provided+6 Services
14% Custom Web Application Development
12% Mobile App Development (iOS & Android)
7% Cloud Consulting & SI
2% Legacy System Modernization
AI Summary
“NewRedo Ltd. is a UK-based IT consulting firm delivering custom software, mobile apps, cloud services, DevOps, cybersecurity, and UX/UI design with agile, end-to-end solutions.”
Duluth Digital
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Digital marketing, website and application development, and creative services.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Cloquet, Minnesota, Us
Services Provided+8 Services
16% Custom Web Application Development
10% E-Commerce Development
7% Legacy System Modernization
7% Social Media Marketing
AI Summary
“Duluth Digital specializes in digital marketing, website and app development, and creative services, providing comprehensive solutions to enhance online presence and business growth.”
Heuri
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Heuri is a digital agency located in Medellín, Colombia, that specializes in WordPress web development and custom software solutions. Established in 2011, we have over ten years of experience assisting businesses in navigating digital transformation through effective, scalable, and strategically ali
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+4 Services
6% Legacy System Modernization
19% Custom Web Application Development
13% Web App UI Design
8% UX Research & Usability Testing
AI Summary
“Heuri, a Medellín-based digital agency since 2011, specializes in WordPress development and custom software, delivering strategic, user-focused digital solutions that drive business growth and transformation.”
Montenegro Systems
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A comprehensive software and web development agency that offers end-to-end digital marketing services, including search engine optimization, pay-per-click advertising, and conversion funnel optimization.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Budva, Me
Services Provided+6 Services
9% Mobile App Development (iOS & Android)
15% Custom Web Application Development
1% Legacy System Modernization
8% Pay Per Click
AI Summary
“Montenegro Systems is a full-service software and web development agency providing comprehensive digital marketing solutions, including SEO, PPC advertising, and conversion funnel optimization for diverse business needs.”
HI Technology & Innovation
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We are a technology and innovation partner located in London, offering comprehensive software support that spans from strategy to execution. Some clients engage us for targeted tech projects, while others depend on our expertise for wider strategic goals. Our team comprises specialists with backgrou
Highlights
$100,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
50-249
Employees
London, England, Gb
Services Provided+9 Services
6% API Development & Integration
4% Legacy System Modernization
10% Custom Web Application Development
5% Mobile App Development (iOS & Android)
AI Summary
“HI Technology & Innovation is a London-based partner delivering end-to-end software strategy and execution across sectors like Retail, FinTech, and Entertainment, trusted by leading global brands.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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