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

Nuval Solutions
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Nuval Solutions focuses on providing tailored software solutions and consulting services designed to help businesses succeed in the rapidly changing digital world. We collaborate with our clients to foster innovation and deliver significant, impactful outcomes by directly addressing complex challeng
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Montevideo, Montevideo, Uy
Services Provided+3 Services
25% Custom Web Application Development
20% Backend Development
15% Frontend Development
15% Legacy System Modernization
AI Summary
“Nuval Solutions delivers tailored software and consulting services, leveraging agile methods and expertise to solve complex challenges and foster long-term client partnerships for business success.”
API DOTS PVT LTD
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API DOTS is among the leading software development firms, fostering a culture of creativity that excels in imagining and creating future mobile apps and custom software. We offer innovative and strategic IT business solutions and services designed to address our clients' toughest challenges, giving
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Sahibzada Ajit Singh Nagar, Punjab, In
Services Provided
20% Custom Web Application Development
10% Legacy System Modernization
20% Mobile App Development (iOS & Android)
50% IT Compliance & Governance
AI Summary
“API DOTS Pvt Ltd is a leading software firm specializing in innovative, customized IT solutions across sectors like healthcare, retail, fintech, education, and blockchain, delivering strategic competitive advantages.”
Aionys
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We assist businesses in addressing skill shortages, speeding up development, optimizing workflows, and scaling efficiently. Our flexible IT solutions, backed by experts, help minimize risks, lower expenses, and achieve quicker outcomes. Here's how we can help: ✅ Support startups – We transform ideas
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Sofia, Sofia, Bg
Services Provided+5 Services
8% Legacy System Modernization
13% API Development & Integration
5% Mobile App Development (iOS & Android)
25% Custom Web Application Development
AI Summary
“Aionys delivers expert IT solutions across healthcare, fintech, real estate, and more, accelerating development, optimizing workflows, and scaling businesses with innovative technologies and 24/7 support.”
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Al-Tina Software Solutions
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Al Tinais is a company with a history and expertise in the electronics sector since 1999, which has also broadened its scope to include solar panel solutions and software development. We offer services to businesses aiming to digitize their operations both within and beyond the Iraqi market, encompa
Highlights
50-249
Employees
Services Provided+1 Services
20% Legacy System Modernization
14% Mobile App Development (iOS & Android)
20% Other IT Consulting and SI
13% ERP Consulting and SI
AI Summary
“Al-Tina Software Solutions, established in 1999, specializes in electronics, solar panel solutions, and software development, supporting businesses in digital transformation across and beyond Iraq.”
Fide-Soft P.S.A.
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Fide-Soft assists manufacturers and distributors in streamlining B2B data exchanges among ERP systems, warehouses, e-commerce platforms, and trading partners. While many companies have ERP and WMS systems in place, their partners often rely on Excel files, manual product entries, and outdated invent
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Warszawa, Masovian, Pl
Services Provided+1 Services
15% Custom Web Application Development
20% E-Commerce Development
8% Legacy System Modernization
7% Mobile App Development (iOS & Android)
AI Summary
“Fide-Soft P.S.A. delivers tailored software and AI-driven integration solutions, streamlining ERP, e-commerce, and partner data synchronization to enhance operational efficiency across diverse industries.”
ATMEZ AI Solutions Pvt. Ltd.
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At ATMEZ AI, we are dedicated to providing inventive technological solutions that facilitate business transformation. By focusing on advanced technologies, we enable organizations to improve their operations, automate processes, and attain sustainable growth. Our knowledge encompasses a wide range o
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+2 Services
23% AI Strategy & Roadmap Consulting
10% Cloud Consulting & SI
17% Mobile App Development (iOS & Android)
17% Legacy System Modernization
AI Summary
“ATMEZ AI Solutions Pvt. Ltd. delivers innovative, customized technological solutions across industries to automate processes, enhance operations, and support sustainable business growth and digital transformation.”
Applifting
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Based in Prague and London, we have been operating for 12 years and have developed over 300 products, with more than 100 satisfied clients. Since 2014, we've collaborated with ambitious startups and established companies such as Erste Group, FTMO, Telus Health, Lumos, and FactSet to create innovativ
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
London, England, Gb
Services Provided+4 Services
7% Legacy System Modernization
18% Custom Web Application Development
8% Mobile App Development (iOS & Android)
33% DevOps Engineering
AI Summary
“Applifting, with 12 years' experience across Prague and London, delivers innovative digital solutions from concept to completion, emphasizing AI, transparency, autonomy, and client-focused collaboration.”
Sky Systems, Inc.
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SkySys assists growing businesses in designing, constructing, modernizing, and maintaining websites, web applications, and digital platforms. We collaborate with founders, nonprofits, educational institutions, healthcare organizations, marketing agencies, and service providers seeking a dependable t
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Raleigh, North Carolina, Us
Services Provided+7 Services
10% E-Commerce Development
8% Legacy System Modernization
8% CMS Development & Customization
13% Custom Web Application Development
AI Summary
“Sky Systems, Inc. designs, develops, and maintains websites and web applications for diverse clients, offering end-to-end technical support, project management, and tailored digital solutions.”
Diffco
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Diffco is a company located in San Francisco that focuses on AI, custom software development, and staffing solutions. With over 17 years of experience in delivering reliable solutions for mobile, web, and AI applications, it aims to foster and enhance your business growth. The products we create are
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
San Jose, California, Us
Services Provided+9 Services
15% Custom Web Application Development
13% Mobile App Development (iOS & Android)
8% Backend Development
8% Frontend Development
AI Summary
“Diffco, based in San Francisco with 17+ years' experience, delivers AI-driven custom software and staffing solutions, serving notable clients with transparent, client-focused project development and team augmentation.”
Decodifi Limited
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At Decodifi, we see ourselves as more than just developers; we are your strategic collaborators in digital transformation. With over 25 years of combined expertise, our team of engineers, designers, and product specialists creates customized, impactful digital solutions that foster genuine business
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Leeds, England, Gb
Services Provided
30% Custom Web Application Development
13% Mobile App Development (iOS & Android)
7% Legacy System Modernization
50% Digital Strategy
AI Summary
“Decodifi Limited is a Leeds-based digital transformation partner delivering tailored, secure web applications, MVPs, CRMs, and dashboards using React, Node.js, and AWS to drive business growth.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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