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

Bitviraj Technology
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BitViraj Technology is an innovative company focused on next-generation blockchain solutions tailored for enterprises. We create and implement scalable Layer 1 blockchains, Layer 2 scaling solutions, and interoperability bridges, along with sophisticated tokenization platforms, decentralized finance
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+2 Services
4% AI Strategy & Roadmap Consulting
3% LLM Integration & Prompt Engineering
27% Generative AI
33% Graphic Design
AI Summary
“Bitviraj Technology develops scalable blockchain solutions including Layer 1 and 2 networks, tokenization, DeFi protocols, and compliance systems, enabling secure, efficient adoption across industries and governments.”
Petruskevich.com
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Empowering Businesses with Tailored WordPress Solutions, AI Automation, and Open Ownership At Petruskevich®, we focus on creating scalable digital assets that businesses genuinely own, not just websites. With over 19 years of experience and more than 200 successful projects under our belt, we have
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
Services Provided+2 Services
28% Custom Web Application Development
20% E-Commerce Development
3% Legacy System Modernization
17% AI Strategy & Roadmap Consulting
AI Summary
“Petruskevich.com delivers custom WordPress development, AI automation, and open-source integrations, empowering businesses with scalable, owner-controlled digital solutions and transparent, strategic partnerships.”
Hunan Piizu Network Technology Co., Ltd
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Hunan Piizu Network Technology Co., Ltd specializes in providing software solutions customized for your business. Our development team consists of a dozen experienced developers, five designers, and three product managers. We offer top-notch software development services to clients worldwide. In add
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Changsha, Hunan, Cn
Services Provided+7 Services
6% Custom Web Application Development
4% Frontend Development
5% Backend Development
1% Legacy System Modernization
AI Summary
“Hunan Piizu Network Technology Co., Ltd offers customized, high-quality software development services worldwide, specializing in web, mobile, backend, and embedded systems with experienced, versatile teams.”
Worldwide TechServices Software Solutions
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Worldwide TechServices (WWTS) has its roots in the establishment of Wang Laboratories in 1951. Originally starting as a service branch of Wang, the company has evolved by prioritizing top-notch IT services and expanding its workforce and systems for a global reach. We embed design-thinking principle
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
250-999
Employees
New York, New York, Us
Services Provided+13 Services
10% Custom Web Application Development
5% Mobile App Development (iOS & Android)
7% Backend Development
5% Frontend Development
AI Summary
“Worldwide TechServices provides tailored software solutions integrating AI, open source, and design-thinking principles, delivering global IT services with a user-focused, iterative development approach.”
Northdoor plc
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Our primary offerings in business and IT management consulting encompass the complete data lifecycle. Exceeding Expectations, our acclaimed methodology is rooted in more than 25 years of IT expertise. By utilizing our strategy, we guarantee that projects are delivered successfully and punctually, ev
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Services Provided+17 Services
3% AI Strategy & Roadmap Consulting
2% Custom AI Chatbot Development
3% Machine Learning Model Development
2% Workflow Automation (Zapier / Make / n8n)
AI Summary
“Northdoor plc specializes in comprehensive business and IT management consulting, delivering successful data lifecycle projects with over 25 years of expertise through its proven methodology.”
Eera Technology
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We are a forward-thinking and creative company focused on advanced data analytics services and the creation of cloud and IoT solutions. Our enthusiasm for technology and dedication to providing outstanding results position us as the perfect partner for all your digital requirements.
Highlights
$25,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Services Provided+9 Services
6% Mobile App Development (iOS & Android)
3% E-Commerce Development
5% Legacy System Modernization
8% Custom Web Application Development
AI Summary
“Eera Technology specializes in advanced data analytics, cloud, and IoT solutions, delivering innovative and reliable digital services tailored to diverse industry needs.”
Omeecron Solutions
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We are Omeecron Solutions, ushering in the age of cutting-edge software technology. Experience outstanding solutions with us at Omeecron. Our goal is to deliver exceptional IT solutions that cater to our customers' current and future business requirements in the most efficient and effective manner.
Highlights
$5,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Surat, Gujarat, In
Services Provided+8 Services
9% Custom Web Application Development
5% Mobile App Development (iOS & Android)
4% E-Commerce Development
2% Legacy System Modernization
AI Summary
“Omeecron Solutions delivers innovative and efficient IT software solutions, addressing both current and future business needs with advanced technology and customer-focused service.”
Avectree
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AvecTree has entered the market with the goal of connecting advanced technology capabilities with everyday businesses. Prioritizing the needs of end-users, we provide web and mobile application development services to help standardize and automate business processes. Our team consists of highly skil
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Milwaukee, Wisconsin, Us
Services Provided+5 Services
23% Mobile App Development (iOS & Android)
7% E-Commerce Development
3% Legacy System Modernization
2% Other IT Consulting and SI
AI Summary
“AvecTree specializes in custom web and mobile application development, leveraging advanced technologies like blockchain, AI/ML, and business intelligence to automate and enhance business processes for diverse clients.”
Web7
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At Web7, we go beyond being a typical digital agency. We consist of a passionate group of developers, designers, and strategists focused on revolutionizing businesses with innovative digital solutions.
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided+13 Services
15% Custom Web Application Development
10% Machine Learning Model Development
5% AI Strategy & Roadmap Consulting
5% API Development & Integration
AI Summary
“Web7 is a digital agency comprising developers, designers, and strategists dedicated to delivering innovative digital solutions that transform and advance businesses across diverse industries.”
Fradys Technologies
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Fradys Technologies is a global company specializing in digital systems that develop AI-driven revenue and operations frameworks with integrated governance. We cater to founders, growth-stage businesses, and large enterprises across the United States, East Africa, and other international markets, pr
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided+13 Services
15% AI Agent & Multi-Agent System Development
10% AI Strategy & Roadmap Consulting
5% Machine Learning Model Development
5% BI & Big Data Consulting & SI
AI Summary
“Fradys Technologies delivers AI-driven digital systems and governance solutions globally, focusing on revenue growth, operational excellence, compliance, and capability building for diverse enterprises.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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