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

Clivo
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Clivo assists businesses in transforming ideas into scalable software solutions. Our emphasis is on creating customized solutions that enable companies to expand and function more effectively. We design and develop web applications, mobile applications, and personalized systems that cater to the spe
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided+1 Services
23% Custom Web Application Development
22% Mobile App Development (iOS & Android)
5% Legacy System Modernization
28% Web App UI Design
AI Summary
“Clivo specializes in developing tailored web, mobile, and software solutions, helping businesses scale efficiently through user-centered design and modern development practices.”
Codes 'n' Coffee Tech.
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We are a software development company that likes to refer to ourselves as a team of superheroes and heroines powered by coffee. 😉 We provide a wide array of services to assist your business in transforming and thriving, including custom web, app, and software development, cloud computing, chatbots,
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Mumbai, Maharashtra, In
Services Provided+3 Services
5% E-Commerce Development
17% Custom Web Application Development
10% Mobile App Development (iOS & Android)
2% Legacy System Modernization
AI Summary
“Codes 'n' Coffee Tech is a versatile software development company offering custom web, app, and software solutions, cloud computing, AI integrations, and UI/UX design to enhance business growth.”
FuzionDev LLC
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Welcome to FuzionDev LLC, a highly-rated IT firm with over 50 professionals dedicated to providing innovative technology solutions for businesses. As a Full-Stack Software Development Agency, we focus on areas such as SaaS Development, AI Solutions, Web and Mobile Application Development, Cloud serv
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+18 Services
3% Frontend Development
4% Backend Development
4% API Development & Integration
1% E-Commerce Development
AI Summary
“FuzionDev LLC is a full-stack software development firm specializing in AI, SaaS, web, mobile, cloud, and automation solutions for scalable, secure business growth.”
Bear Systems
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At Bear Systems, we bridge the divide between untapped business potential and effective technical implementation. Our focus extends beyond software development; we design the digital foundation for Indian companies. We handle everything from tailored ERP solutions (like SAP, Odoo, ERPNext) to large-
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Gurugram, Haryana, In
Services Provided+15 Services
10% HR Consulting Services
5% AI Agent & Multi-Agent System Development
5% AI Strategy & Roadmap Consulting
5% Machine Learning Model Development
AI Summary
“Bear Systems offers expert custom software development, focusing on ERP solutions, e-commerce platforms, API integration, and mobile app development, making it a strong fit for the Software Development category with comprehensive and tailored digital solutions.”
ITIRRA
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Established in 2008, Itirra is a boutique technology consulting firm located in Kirkland, WA, made up of a dedicated team of professionals focused on building long-lasting client relationships founded on trust and respect. At Itirra, we aim to restore passion and care to software development, which
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Kirkland, Washington, Us
Services Provided+4 Services
17% Mobile App Development (iOS & Android)
3% Legacy System Modernization
14% Custom Web Application Development
7% Other IT Consulting and SI
AI Summary
“Founded in 2008, Itirra is a boutique technology consulting firm in Kirkland, WA, specializing in custom cloud, mobile, and data-driven solutions for growing businesses and healthcare.”
NetzOptimize Inc.
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NetzOptimize is a leading software company that provides comprehensive end-to-end development services to businesses of all sizes. Our offerings encompass every stage of the software development lifecycle, including design and prototyping, development, quality assurance/testing, deployment, and main
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Miami, Florida, Us
Services Provided+14 Services
7% Custom Web Application Development
5% Mobile App Development (iOS & Android)
7% Backend Development
7% Frontend Development
AI Summary
“NetzOptimize Inc. delivers comprehensive software development services, leveraging expertise in design, development, testing, and deployment using modern technologies and Agile methodologies to serve diverse clients globally.”
Dual Technology Services
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We are a company focused on enhancing processes using technology, mobile solutions, web development, integrations, business intelligence, and software implementation.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
San Pedro Sula, Hn
Services Provided+7 Services
13% Custom Web Application Development
5% E-Commerce Development
5% Legacy System Modernization
10% Mobile App Development (iOS & Android)
AI Summary
“Dual Technology Services specializes in technology-driven solutions including software development, UI/UX design, AI and automation, and IT consulting, enhancing business processes and digital transformation.”
Phuse
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We are a digital agency that leverages design and development to address challenges, collaborating closely with clients as partners to develop enduring solutions that enhance conversion rates, productivity, and customer satisfaction.
Highlights
$25,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Services Provided+4 Services
17% Custom Web Application Development
15% Mobile App Development (iOS & Android)
2% Legacy System Modernization
13% Product UX Strategy
AI Summary
“Phuse is a digital agency specializing in collaborative design and development to create lasting solutions that improve client conversion rates, productivity, and customer satisfaction.”
SiteRocket Labs
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SiteRocket Labs develops tailored web applications and digital products designed to address intricate issues. Businesses turn to us when they require websites that cater to specific requirements—such as showcasing data, optimizing logistics, facilitating secure transactions, and beyond. Our bespoke
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Services Provided+6 Services
10% Backend Development
3% Legacy System Modernization
20% Custom Web Application Development
7% Interaction Design
AI Summary
“SiteRocket Labs specializes in developing customized, reliable web applications and digital products that address complex business needs, enhancing data presentation, logistics, security, and scalability.”
Total Blossom LLC
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Total Blossom is a full-service software and internet marketing agency located in Los Angeles, dedicated to fostering business growth. We assess and address digital challenges, creating effective strategies to provide outstanding customer experiences through software development, design, content cre
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Lawndale, California, Us
Services Provided+14 Services
7% Mobile App Development (iOS & Android)
3% Legacy System Modernization
5% E-Commerce Development
2% Blockchain & Web3 Development
AI Summary
“Total Blossom LLC is a Los Angeles-based full-service agency offering software development, design, content creation, and digital marketing solutions to enhance business growth and customer experience.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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