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

YugantarX
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YugantarX is an innovative consulting and digital transformation firm that empowers businesses, organizations, and governments through strategy driven by innovation and advanced technology solutions. We function at the crossroads of strategy, design, and engineering to create flexible, scalable, and
Highlights
< $25/hr
Avg Hourly Rate
10-49
Employees
Services Provided+7 Services
8% Mobile App Development (iOS & Android)
14% Custom Web Application Development
7% Legacy System Modernization
5% E-Commerce Development
AI Summary
“YugantarX is a global consulting firm delivering innovative digital transformation through strategy, AI, cloud, cybersecurity, and automation, creating scalable, user-centric solutions across industries.”
Tetragonos
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Tetragonos is a leading partner in technical product development, transforming innovative ideas into market-ready solutions. Unlike traditional agencies, our team is made up of engineers and product strategists who blend deep technical expertise with scientific approaches and business acumen. We spe
Highlights
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided+1 Services
20% Custom Web Application Development
9% E-Commerce Development
5% Legacy System Modernization
33% Product Design
AI Summary
“Tetragonos partners with startups and businesses, combining engineering expertise and behavioral science to develop innovative, market-ready technical products addressing real user needs and growth.”
Code Matrix India Pvt Ltd
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Code Matrix is a software services company that provides web, mobile, and AI technology solutions across different industries. We specialize in MEAN/MERN stack, Python, and various mobile technologies. Our offerings include custom software development, e-commerce solutions, DevOps services, business
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Bengaluru, Karnataka, In
Services Provided+8 Services
10% Custom Web Application Development
10% Mobile App Development (iOS & Android)
3% SaaS Product Development
5% E-Commerce Development
AI Summary
“Code Matrix India Pvt Ltd delivers custom software, web and mobile app development, AI-driven automation, and legacy modernization using MEAN/MERN stack and Python to serve diverse industries.”
TechLoom Global
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TechLoom Global is a consulting firm that focuses on assisting SaaS companies in their growth through expert staff augmentation, managed services, and professional services. We excel at linking businesses with exceptional global talent, including product managers, engineers, sales executives, and go
Highlights
$25,000+
Min Project Size
< $25/hr
Avg Hourly Rate
50-249
Employees
Services Provided+6 Services
8% Custom Web Application Development
1% E-Commerce Development
6% Backend Development
5% Frontend Development
AI Summary
“TechLoom Global partners with SaaS companies to provide expert staff augmentation, managed, and professional services, delivering tailored talent solutions and industry expertise across software development and sales worldwide.”
Aura Labs
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Aura Labs is an innovative agency that designs acclaimed solutions for companies aiming to connect with individuals and engage a large audience. Go beyond traditional mediums to develop seamless out-of-home experiences that align with your brand. We merge creativity with digital expertise to deliver
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Hong Kong, Hk
Services Provided+3 Services
18% Custom Web Application Development
2% Legacy System Modernization
20% Other IT Consulting and SI
12% Other Digital Marketing
AI Summary
“Aura Labs is an innovative agency specializing in creating engaging, seamless out-of-home and digital experiences that connect brands with large audiences through creative and technological integration.”
Epidata SA
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We are a leading global private firm specializing in innovation outsourcing. At Epidata, we enhance organizations by merging software engineering, exceptional talent, and in-depth knowledge of cutting-edge technologies, making a tangible difference in people's lives. We collaborate with our clients
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
250-999
Employees
ACE, Ar
Services Provided+5 Services
10% API Development & Integration
13% Custom Web Application Development
7% Mobile App Development (iOS & Android)
3% Legacy System Modernization
AI Summary
“Epidata SA is a global innovation outsourcing firm integrating software engineering and advanced technologies to develop practical solutions, partnering with leading companies since 2003 to transform businesses and societies.”
XAMTA INFOTECH
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Xamta Infotech - Your Partner for ODOO Development Affordable Expertise Available at Just $15/hour! Special discounts for long-term agreements. Why Choose Us? ✔ ODOO Experts - Proficient in all versions (Community & Enterprise) ✔ Industry Knowledge: FinTech, Government, Insurance, Sales, Manufacturi
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+4 Services
13% Custom Web Application Development
7% E-Commerce Development
25% ERP & CRM Development
5% Legacy System Modernization
AI Summary
“Xamta Infotech offers expert ODOO development services across industries like FinTech and manufacturing, providing affordable, customized solutions, ongoing support, and experienced specialists for business growth.”
Sai Technologies
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Sai Technologies is a cutting-edge IT firm leading the way in technological advancements. Committed to providing outstanding solutions, the company offers a wide array of services that address the digital requirements of businesses across different sectors. Their offerings range from web application
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Madurai, Tamil Nadu, In
Services Provided+10 Services
17% Custom Web Application Development
10% Mobile App Development (iOS & Android)
5% E-Commerce Development
2% Legacy System Modernization
AI Summary
“Sai Technologies, founded in 2009, delivers integrated IT solutions including web applications, AI, infrastructure, and branding from multiple Indian locations to support diverse business needs.”
Granados AI
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Granados AI is an agency located in Guatemala that focuses on professional web design and AI automation services for businesses throughout Guatemala and Central America. We create custom websites from the ground up within 7-10 days, avoiding the use of templates or recycled designs. Each website is
Highlights
2-9
Employees
Services Provided+5 Services
18% Custom Web Application Development
8% Legacy System Modernization
6% Product UX Strategy
12% Mobile App UI Design
AI Summary
“Granados AI, based in Guatemala, specializes in custom web design and AI automation services—including chatbots and CRM integration—serving diverse Central American businesses with tailored, conversion-optimized solutions.”
GDSoftwares
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We are an outsourced software development firm based in India. GD Softwares specializes in creating custom software applications tailored to our clients' requirements. We leverage top-tier skills and knowledge to deliver cutting-edge technology solutions. Our software development tools and products
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Services Provided+3 Services
20% Custom Web Application Development
10% Mobile App Development (iOS & Android)
8% Backend Development
7% Frontend Development
AI Summary
“GD Softwares is an Indian outsourced software development firm specializing in custom, cutting-edge applications using object-oriented design and latest technologies across multimedia and internet domains.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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