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

FlutterDesk
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We founded FlutterDesk with the goal of infusing the software services sector with innovation, integrity, and agility—the essential qualities of Silicon Valley startups. We aimed to create a software services company that we, as entrepreneurs and executives, would be eager to collaborate with. When
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided
40% Mobile App Development (iOS & Android)
5% Legacy System Modernization
5% QA & Software Testing
50% Mobile & App Marketing
AI Summary
“FlutterDesk is a software services company founded to embody Silicon Valley's innovation, integrity, and agility, delivering high-quality solutions aligned with entrepreneurial standards.”
Virtualspirit
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VirtualSpirit is a software development and AI solutions company located in Malaysia, focusing on creating custom web, mobile, SaaS, and operational systems tailored for growing businesses and enterprises. Since 2014, we have assisted startups, SMEs, and established organizations in turning concepts
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Petaling Jaya, Selangor, My
Services Provided+6 Services
5% Mobile App Development (iOS & Android)
5% Frontend Development
3% Progressive Web App (PWA) Development
5% API Development & Integration
AI Summary
“VirtualSpirit, a Malaysian tech company since 2014, delivers custom web, mobile, SaaS, and AI solutions, enabling businesses to scale with modern development, automation, and cross-industry expertise.”
Internative
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Internative is an AI and custom software development firm located in Istanbul, dedicated to assisting businesses in transforming intricate operations into scalable digital frameworks. Since our inception in 2015, we have created web, mobile, and enterprise software solutions for startups, SMEs, and
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Kadikoy, Istanbul, Tr
Services Provided+3 Services
13% Custom Web Application Development
15% Mobile App Development (iOS & Android)
15% SaaS Product Development
8% Legacy System Modernization
AI Summary
“Internative is an Istanbul-based AI and custom software firm offering scalable web, mobile, and enterprise solutions across diverse sectors, integrating technical execution with business growth strategies since 2015.”
ThinkPalm Technologies
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ThinkPalm Technologies Pvt. Ltd. is an innovative, AI-driven Product Engineering and Software Development firm founded in 2010 and headquartered in Kochi, India. Since its launch, ThinkPalm has been dedicated to transforming the changing needs of customers into creative business solutions for intern
Highlights
$25,000+
Min Project Size
< $25/hr
Avg Hourly Rate
250-999
Employees
Kochi, Kerala, In
Services Provided+2 Services
30% Custom Web Application Development
15% Mobile App Development (iOS & Android)
5% Legacy System Modernization
20% AI Agent & Multi-Agent System Development
AI Summary
“ThinkPalm Technologies is a global AI-driven software and product engineering firm offering innovative digital solutions and platforms across diverse industries including telecom, maritime, and fintech.”
Freshosoft
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Freshosoft's business philosophy focuses on delivering top-quality products, achieving complete client satisfaction, providing timely solutions, and offering the best quality-to-price ratio available in the industry.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+2 Services
15% Mobile App Development (iOS & Android)
20% Custom Web Application Development
8% Legacy System Modernization
7% ERP & CRM Development
AI Summary
“Freshosoft specializes in delivering high-quality products with a strong commitment to client satisfaction, timely solutions, and competitive quality-to-price ratios across industries.”
Soft Valley
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A Leading Software Company Specializing in Rapid and Effective Project Delivery Using Industry-Standard Technologies. Soft Valley, established in 2020 by seasoned software developers, has built a solid reputation for delivering projects quickly and efficiently. Our commitment to industry-standard te
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Dhaka, Dhaka, Bd
Services Provided+1 Services
30% Custom Web Application Development
25% Mobile App Development (iOS & Android)
20% API Development & Integration
20% E-Commerce Development
AI Summary
“Soft Valley, founded in 2020, delivers high-quality, rapid software solutions across web, mobile, UI/UX, CRM, e-commerce, and cloud services, fostering strong client partnerships and industry growth.”
Interone Technologies
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We are a digital product engineering firm that combines experience design with advanced engineering to assist our clients in envisioning new possibilities and speeding up their shift towards future digital enterprises.
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Bengaluru, Karnataka, In
Services Provided
10% Legacy System Modernization
25% Custom Web Application Development
15% E-Commerce Development
50% IT Staff Augmentation
AI Summary
“Interone Technologies is a digital product engineering firm specializing in custom software development, AI-driven automation, and IT staff augmentation to accelerate digital transformation.”
Bold Tech
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Based in Orlando, Florida, we focus on designing and managing your business website, enhancing your online visibility, and providing SEO and digital marketing services. We ensure you can concentrate on expanding your business, whether it's large or small. Our services include custom software develop
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Winter Park, Florida, Us
Services Provided+1 Services
23% Custom Web Application Development
10% Legacy System Modernization
27% Search Engine Optimization (SEO)
7% Other Digital Marketing
AI Summary
“Bold Tech delivers custom software development, web design, digital marketing, SEO, and cybersecurity services, helping businesses enhance online presence, secure systems, and modernize IT infrastructure.”
EightDevs
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Bezos once stated that an ideal team size is one that can be fed with two large pizzas. Through experience, we have come to realize that the best size for any project is eight people: two front-end developers, two back-end developers, a designer, a tech team lead, a project manager, and a QA special
Highlights
$25,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Kyiv, Kv, Ua
Services Provided+4 Services
8% Mobile App Development (iOS & Android)
12% Custom Web Application Development
5% E-Commerce Development
5% Legacy System Modernization
AI Summary
“EightDevs delivers end-to-end technology solutions including software development, digital marketing, and cybersecurity, utilizing dedicated teams to ensure quality, client focus, and seamless project execution.”
Out of Business -Vasterra
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Vasterra is a software development company focused on delivering client-oriented digital solutions that yield measurable results. We operate in sectors such as e-commerce, retail, and real estate, assisting businesses in engaging with valuable users and customers through dependable software. Additio
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
London, England, Gb
Services Provided+2 Services
15% E-Commerce Development
18% Custom Web Application Development
12% Mobile App Development (iOS & Android)
5% Legacy System Modernization
AI Summary
“Vasterra develops tailored digital software solutions across e-commerce, retail, and real estate, focusing on client goals, digital transformation, automation, and scalable technologies for business growth.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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