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

Rishabh Software
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We are a worldwide partner in Digital Engineering and Enterprise Transformation, assisting businesses in scaling, innovating, and excelling in today's digital-centric environment. With over 25 years of experience and more than 1,400 digital solutions implemented in over 25 countries, we empower our
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
250-999
Employees
Vadodara, Gujarat, In
Services Provided+6 Services
23% Custom Web Application Development
15% Mobile App Development (iOS & Android)
8% Legacy System Modernization
5% QA & Software Testing
AI Summary
“Rishabh Software is a global digital engineering and enterprise transformation partner, leveraging cloud, AI, and analytics to deliver innovative solutions that drive scalable business growth across multiple industries.”
ThoughtMinds
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ThoughtMinds is a technology solution provider that focuses on AI and digital engineering for AI-driven digital enterprises, ranging from rapidly growing startups to large Fortune companies, across various sectors including manufacturing, healthcare, technology, banking, and finance. We offer AI bus
Highlights
50-249
Employees
San Francisco, California, Us
Services Provided+2 Services
30% Generative AI
20% AI Model Fine-Tuning & Training
20% Custom Web Application Development
13% Legacy System Modernization
AI Summary
“ThoughtMinds provides AI and digital engineering solutions to diverse sectors, leveraging its Half Human + Half AI approach to drive innovation, efficiency, and scalable AI business transformation.”
WhiteBox Group
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WhiteBox Group was established in 2016 and serves as the leading entity among our software development companies, overseeing all customer relations. We handle solution development, team building, delivery support, due diligence, and efficiency management. On the other hand, our software development
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Kharkiv, Kharkiv, Ua
Services Provided+1 Services
20% ERP & CRM Development
10% Legacy System Modernization
13% Custom Web Application Development
7% E-Commerce Development
AI Summary
“Founded in 2016, WhiteBox Group leads software development companies, offering comprehensive services including project development, team building, solution architecture, and outsourcing for CRM and ERP systems.”
Tacpoint
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Tacpoint is a comprehensive digital product agency boasting over 20 years of expertise in creating user-centered, accessible, and flexible digital experiences and products. Our diverse team is dedicated to developing engaging and enjoyable solutions that enhance our clients' success. By providing ex
Highlights
$25,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
San Francisco, California, Us
Services Provided+4 Services
27% Custom Web Application Development
7% Legacy System Modernization
13% Product UX Strategy
10% UX Research & Usability Testing
AI Summary
“Tacpoint is a digital product agency with 20+ years of experience delivering user-centered, accessible, and scalable solutions, blending large agency expertise with personalized service to drive client success.”
MoldoWEB
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We are a company specializing in web and mobile app development, dedicated to creating fast, scalable, and efficient applications that facilitate the digital transformation of your products and processes. Our IT expertise aligns with your business ideas, leading to a collaborative team focused on ex
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Cluj-Napoca, Cluj, Ro
Services Provided+5 Services
10% Backend Development
4% Code Review & Technical Audits
4% Legacy System Modernization
8% Custom Web Application Development
AI Summary
“MoldoWEB, founded in 2015 in Romania, delivers scalable web and mobile app development, IT outsourcing, and custom software solutions, emphasizing quality, innovation, and client collaboration globally.”
Syngis Software Development
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We are a seasoned software development firm that focuses on Microsoft technologies for applications, web, and desktop software development. Our smaller team emphasizes a personal approach to collaborating with your business. Let us offer you support and development services, allowing you to concentr
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided
25% Custom Web Application Development
10% Legacy System Modernization
15% Mobile App Development (iOS & Android)
50% Cloud Consulting & SI
AI Summary
“Syngis Software Development delivers personalized Microsoft-based software solutions, integrating AI, cloud consulting, and system modernization to enhance business efficiency and digital transformation.”
Reactron Technologies
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When you encounter a technical issue, you won't search on Google; instead, you turn to Reactron Technologies. We're your trusted Tech Consultant.
Highlights
$5,000+
Min Project Size
2-9
Employees
Espoo, Uusimaa, Fi
Services Provided
15% Mobile App Development (iOS & Android)
25% Custom Web Application Development
10% Legacy System Modernization
50% IT Staff Augmentation
AI Summary
“Reactron Technologies serves as a trusted tech consultancy, providing expert solutions and guidance to resolve technical issues efficiently across various technology domains.”
The Jonah Group
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We create exceptional software and foster strong relationships. The right software can significantly influence your business's capacity to innovate and expand. However, what's the best way to achieve this? We assist our clients in addressing vital business challenges, while also recognizing that bui
Highlights
$10,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
50-249
Employees
Toronto, Ontario, Ca
Services Provided+1 Services
5% Blockchain & Web3 Development
10% Mobile App Development (iOS & Android)
7% Legacy System Modernization
28% Custom Web Application Development
AI Summary
“The Jonah Group develops exceptional software solutions, helping businesses overcome key challenges through innovation and fostering long-term trust for sustained growth and success.”
Agile Soft Systems, Inc
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At @agilesoft, we empower enterprises to enhance and revolutionize their businesses by offering cutting-edge software development services. We adopt an agile and collaborative approach to create top-tier solutions for companies worldwide. Our extensive experience in comprehensive product development
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Fremont, California, Us
Services Provided+2 Services
10% Mobile App Development (iOS & Android)
8% Legacy System Modernization
5% E-Commerce Development
12% QA & Software Testing
AI Summary
“Agile Soft Systems, Inc. delivers agile, collaborative software development and IT services globally, specializing in product development, application development, and quality assurance to drive business innovation.”
Coderio
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We are the leading Nearshore Software Outsourcing firm in the Americas. We operate at the intersection of engineering and strategy, merging technology expertise, high-quality standards, and diverse industry experience to create top-notch technology solutions. Our software development teams, aligned
Highlights
$100,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
250-999
Employees
New York, New York, Us
Services Provided+7 Services
7% Legacy System Modernization
7% E-Commerce Development
13% Custom Web Application Development
7% Mobile App Development (iOS & Android)
AI Summary
“Coderio is a leading Nearshore Software Outsourcing firm in the Americas, delivering tailored, high-quality software development teams and solutions to support businesses' digital transformation needs.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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