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

Sparrow Forge Ltd.
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Sparrow Forge Ltd. (SFL) is a software development firm that creates enterprise solutions and mobile applications, providing specialized consulting services to assist businesses in thriving and achieving success in the digital age.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+5 Services
5% Frontend Development
13% Mobile App Development (iOS & Android)
5% Legacy System Modernization
7% API Development & Integration
AI Summary
“Sparrow Forge Ltd. develops enterprise software and mobile applications, offering expert consulting to help businesses thrive in the digital era.”
B
B Startups
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B2B contract collaborations with companies in the US. EU-based software consultancy, prepared to assist your business with various projects. Services include Front End Development, Fullstack Development, API Integrations, and E-commerce integration, backed by 20 years of experience.
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
Alicante (Alacant), Es
Services Provided+1 Services
25% API Development & Integration
30% Custom Web Application Development
10% Legacy System Modernization
10% QA & Software Testing
AI Summary
“B Startups is an EU-based software consultancy specializing in B2B collaborations with US companies, offering Front End, Fullstack Development, API, and E-commerce integration services with 20 years experience.”
Xonier technologies Inc.
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We are a comprehensive digital marketing and IT solutions provider, ranked among the top companies globally, serving over 250 clients. Our commitment is to deliver outstanding and tailored integrated IT services to enhance your brand. With nearly a decade of extensive experience, we cater to a varie
Highlights
$5,000+
Min Project Size
< $25/hr
Avg Hourly Rate
50-249
Employees
Pittsfield, Massachusetts, Us
Services Provided+2 Services
17% Mobile App Development (iOS & Android)
14% Custom Web Application Development
3% Legacy System Modernization
25% Digital Strategy
AI Summary
“Xonier Technologies Inc. delivers tailored IT and digital marketing solutions, including software development, mobile apps, UI/UX design, and digital strategy, serving diverse industries globally with nearly a decade of experience.”
Peaksoft
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Peaksoft offers access to skilled teams of seasoned software engineers and specialists who create customized solutions, helping clients save time and resources.
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Des Plaines, Illinois, Us
Services Provided+7 Services
10% Custom Web Application Development
7% Mobile App Development (iOS & Android)
4% Legacy System Modernization
9% Backend Development
AI Summary
“Peaksoft is a US-based technology company providing custom software development, UX/UI design, IT staff augmentation, and AI-driven solutions, delivering tailored products across diverse industries.”
KMS Technology
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Creating Products and Systems for Future Innovation KMS Technology is a strategic engineering firm dedicated to helping businesses quickly transform ambitious ideas into impactful solutions. Established in 2009 as a service provider in the U.S., we have expanded into a global entity with offices in
Highlights
1000-9999
Employees
Atlanta, Georgia, Us
Services Provided+4 Services
18% Custom Web Application Development
12% Mobile App Development (iOS & Android)
5% Legacy System Modernization
15% QA & Software Testing
AI Summary
“KMS Technology delivers expert software development and AI-driven solutions globally, enabling businesses to innovate, modernize systems, and achieve impactful, future-ready products with quality assurance.”
Azati Software
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Since 2002, Azati has been offering design and development services to support the growth of companies in insurance, life sciences, recruitment, media, and more. We have a legal entity in the USA and an R&D center in Poland, allowing us to provide both on-site and off-site support based on project n
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
250-999
Employees
Warszawa, Masovian, Pl
Services Provided+21 Services
9% Custom Web Application Development
6% Mobile App Development (iOS & Android)
3% E-Commerce Development
3% Legacy System Modernization
AI Summary
“Azati Software delivers design, development, and R&D services including AI, data science, and machine learning to various industries, supporting growth through flexible on-site and off-site solutions.”
East Coast Web Solutions
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At East Coast Web Solutions, we prioritize personal service. We handle all our work in-house and never outsource to other companies or overseas. Our projects are completed entirely in the United States by our team of highly trained and skilled professionals.
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Limestone, Maine, Us
Services Provided+16 Services
8% CMS Development & Customization
5% Legacy System Modernization
15% Custom Web Application Development
5% E-Commerce Development
AI Summary
“East Coast Web Solutions delivers personalized web services managed entirely in-house by skilled U.S.-based professionals, ensuring quality and direct client engagement.”
Mavroqit
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Marvoqit is a specialized technology partner that assists European engineering teams in delivering solutions more quickly, securely, and intelligently. We create, develop, and protect essential platforms using an outcome-oriented methodology and transparent processes. Our expertise lies in Enterpris
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+10 Services
7% Legacy System Modernization
3% API Development & Integration
1% Mobile App Development (iOS & Android)
6% Custom Web Application Development
AI Summary
“Mavroqit partners with European engineering teams to accelerate secure enterprise software development, cloud infrastructure, cybersecurity, AI, and digital transformation, ensuring GDPR compliance and optimized product delivery.”
InterConnecta
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InterConnecta is an international consulting firm that focuses on Zoho solutions for businesses around the globe. They utilize their expertise to help organizations leverage Zoho technology to foster growth, boost productivity, and increase profitability. The team at InterConnecta, comprising highly
Highlights
$1,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Commack, New York, Us
Services Provided+12 Services
3% Mobile App Development (iOS & Android)
3% Legacy System Modernization
5% E-Commerce Development
14% ERP & CRM Development
AI Summary
“InterConnecta is a global consulting firm specializing in Zoho solutions, offering tailored implementations, optimizations, and AI integrations to enhance business efficiency across diverse industries.”
rsAutomazione
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rsAutomazione is an Italian software firm that specializes in industrial digitalization and custom software development for the manufacturing sector. Established in 1993 in Turin, we leverage over 30 years of engineering expertise alongside contemporary, agile software practices to provide scalable
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided+4 Services
17% Custom Web Application Development
12% API Development & Integration
5% Legacy System Modernization
5% AI Strategy & Roadmap Consulting
AI Summary
“rsAutomazione is an Italian software firm specializing in tailored industrial digitalization solutions, offering MES/WMS platforms, CNC/CAM tools, AI applications, and CPQ systems to enhance manufacturing operations.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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