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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We evaluate companies on verified profile data: services, pricing, locations, and portfolio. Client reviews are being collected. We may earn a fee for some placements. How we rank and verify

4,482 Companies

List of the Best Legacy System Modernization Agencies

IT-m
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Teams for Web and Mobile Development
Highlights
$25-49/hr
Avg Hourly Rate
10-49
Employees
Yerevan, Am
Services Provided
23% Mobile App Development (iOS & Android)
25% Custom Web Application Development
2% Legacy System Modernization
50% Machine Learning Model Development
AI Summary
“IT-m specializes in delivering expert teams for web and mobile development, providing tailored software solutions to meet diverse business needs across various industries.”
Ayata Inc.
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We are a leading emerging software company in Nepal, offering top-notch product design and software development services. With over 100 satisfied customers across various national and international sectors, we provide customized and enterprise solutions at a reasonable investment level and ensure qu
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Kathmandu, Bagmati, Np
Services Provided+5 Services
15% Mobile App Development (iOS & Android)
15% Custom Web Application Development
8% API Development & Integration
5% Legacy System Modernization
AI Summary
“Ayata Inc. is a Nepal-based software company delivering customized, scalable solutions—including apps, analytics, and SaaS—to diverse global clients across multiple industries, ensuring quality and tailored services.”
Gulf Coast Solutions
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We are your strategic ally in enhancing efficiency and driving growth throughout your organization. Our focus is on providing innovative solutions for ongoing improvement projects, smooth integration, customized application development, and strategic initiatives that advance your business. With a so
Highlights
$10,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Humble, Texas, Us
Services Provided+5 Services
10% Custom Web Application Development
8% API Development & Integration
4% Legacy System Modernization
4% ERP & CRM Development
AI Summary
“Gulf Coast Solutions delivers tailored technologies and strategic services enhancing efficiency, productivity, and communication for mid-sized industrial and construction firms, driving sustained operational growth.”
Just Java Technologies
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Just Java is a software engineering company with more than 24 years of experience in creating scalable, resilient, and high-performance digital platforms. We specialize in comprehensive custom software development for startups, small to medium-sized enterprises, and large organizations. Our solution
Highlights
$5,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Services Provided+4 Services
10% Custom Web Application Development
5% Mobile App Development (iOS & Android)
5% API Development & Integration
5% Legacy System Modernization
AI Summary
“Just Java Technologies delivers expert custom software solutions, including MVP development and legacy upgrades, leveraging 24+ years of Java expertise across fintech, logistics, healthcare, and more.”
KOOP & Company, LLC
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A consulting and IT service firm catering to businesses of all sizes, offering project management, IT professional services, advisory support, technology selection and implementation, mobile and online development, system integration, and strategic management consulting.
Highlights
$50-99/hr
Avg Hourly Rate
2-9
Employees
Cincinnati, Ohio, Us
Services Provided+5 Services
17% Mobile App Development (iOS & Android)
14% Custom Web Application Development
3% Legacy System Modernization
8% BI & Big Data Consulting & SI
AI Summary
“KOOP & Company, LLC. provides comprehensive consulting and IT services, including project management, system integration, technology implementation, and strategic advisory for diverse business needs.”
Xentrolance
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Xentrolance is a technology and software development company that caters primarily to enterprises, specializing in solutions based on Blockchain and Artificial Intelligence. We assist businesses in creating, deploying, and expanding secure and high-performing systems that facilitate essential operat
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided+1 Services
30% Blockchain & Web3 Development
15% Custom Web Application Development
5% Legacy System Modernization
20% AI Strategy & Roadmap Consulting
AI Summary
“Xentrolance specializes in blockchain and AI software solutions for enterprises, delivering secure, high-performance systems that enable essential operations and foster sustainable business growth.”
SMART&FUN
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A custom software development firm that emphasizes UI/UX design, boasts extensive experience with Agile methodologies, utilizes the latest development technologies, and possesses significant expertise in hardware integrations.
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+1 Services
30% Custom Web Application Development
15% Mobile App Development (iOS & Android)
5% Legacy System Modernization
30% Product UX Strategy
AI Summary
“SMART&FUN specializes in custom software development with strong UI/UX design focus, Agile methodology experience, advanced technologies, and proficiency in hardware integration solutions.”
Tomzach Inc.
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Regardless of your business requirements, we offer digital solutions such as machine learning, graph databases, APIs, automation, and microservices. Additionally, we provide software integrations and support through consulting services.
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided+3 Services
18% Custom Web Application Development
10% Mobile App Development (iOS & Android)
8% E-Commerce Development
7% Legacy System Modernization
AI Summary
“Tomzach Inc. delivers comprehensive digital solutions including custom software, AI-driven automation, e-commerce platforms, and consulting, enabling robust modernization and transformation for diverse business needs.”
DevX Consultancy
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"I hired the DevX team to create the News Line mobile app. They completed the project swiftly and provided excellent support both during and after the launch. Their technical expertise is impressive, and their communication is very clear. I highly recommend their services." "Hello! We are an IT se
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided+1 Services
25% Mobile App Development (iOS & Android)
5% Legacy System Modernization
15% Custom Web Application Development
5% E-Commerce Development
AI Summary
“DevX Consultancy is an Indian IT services firm specializing in full-stack web and mobile app development and AWS cloud solutions, known for swift delivery and strong client communication.”
One Month Apps
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One Month Apps focuses on developing native mobile applications for businesses of any size. With years of experience in crafting high-quality mobile apps, we employ the most up-to-date development practices to produce visually appealing apps in a short timeframe.
Highlights
$100-149/hr
Avg Hourly Rate
2-9
Employees
Services Provided+2 Services
8% Custom Web Application Development
38% Mobile App Development (iOS & Android)
5% Legacy System Modernization
12% Product UX Strategy
AI Summary
“One Month Apps specializes in creating high-quality native mobile applications for businesses, leveraging current development practices to deliver visually appealing apps efficiently across sectors.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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