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

Portobyte
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We are a consulting firm specializing in Business Process Automation and software development, dedicated to creating the most effective software solutions for you. With our expertise in life sciences, fintech, and government initiatives, we are assured that we can tackle any challenge that comes our
Highlights
$150+/hr
Avg Hourly Rate
Zagreb, Grad Zagreb, Hr
Services Provided+1 Services
14% Legacy System Modernization
20% Custom Web Application Development
23% Other IT Consulting and SI
10% IT Staff Augmentation
AI Summary
“Portobyte is a consulting firm specializing in business process automation and software development, delivering effective solutions across life sciences, fintech, and government sectors.”
Convverge, Inc.
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At Convverge, we bring together people and technology to foster growth and success. Our dual mission is to provide our clients with the specific technology required for their business development while ensuring our team is engaged with cutting-edge solutions that enhance their professional satisfact
Highlights
$1,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Calgary, Alberta, Ca
Services Provided+6 Services
10% BI & Big Data Consulting & SI
10% Cloud Consulting & SI
10% Software Development Services
10% ECM Consulting and SI
AI Summary
“Convverge, Inc. provides customized Microsoft cloud solutions and expert services, enabling clients to optimize IT investments, streamline operations, and enhance business growth through technology.”
Rosnium
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Rosnium is a company specializing in AI transformation and software engineering, providing digital transformation, modernization, and managed services to large and mid-sized organizations in sectors such as financial services, logistics, commercial real estate, and the social sector. We support orga
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided+1 Services
35% Custom Web Application Development
15% Legacy System Modernization
20% AI Strategy & Roadmap Consulting
25% Custom AI Chatbot Development
AI Summary
“Rosnium delivers AI transformation and software engineering solutions, supporting enterprises in financial services, logistics, real estate, and social sectors through modernization, platform development, and managed services.”
AKOS
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We focus on major projects aimed at delivering certainty at twice the speed. We embrace rapid failures and are not deterred by the challenges of evolving priorities, as long as we create value. With offices and management teams in Phoenix, San Diego, Seattle, and Toronto, AKOS stands out as a top da
Highlights
$50,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Scottsdale, Arizona, Us
Services Provided+4 Services
10% Legacy System Modernization
25% Custom Web Application Development
15% Mobile App Development (iOS & Android)
5% IT Staff Augmentation
AI Summary
“AKOS is a leading agency specializing in data analytics, eCommerce, and custom software development, delivering rapid, innovative AI-driven solutions across diverse sectors with reliability and expertise.”
Laplacian
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LAPLACIAN is a consulting and software development firm established in Split, Croatia. We focus on creating, optimizing, and improving your vision as it transforms into a reliable, efficient, agile, and stable product. If you already have an existing product, our team is adaptable and willing to int
Highlights
10-49
Employees
Services Provided
33% Custom Web Application Development
17% Legacy System Modernization
28% Other IT Consulting and SI
22% IT Staff Augmentation
AI Summary
“LAPLACIAN is a Croatia-based consulting and software development firm specializing in creating, optimizing, and integrating efficient, agile, and stable products with advanced technologies.”
A-CX
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A-CX collaborates with founders, product leaders, and large organizations to develop, create, and expand secure digital products. We merge product strategy, contemporary software engineering, and practical AI integration to accelerate the journey from concept to production. Our primary services incl
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
San Jose, California, Us
Services Provided+6 Services
13% Custom Web Application Development
2% Mobile App Development (iOS & Android)
10% Legacy System Modernization
9% AI Strategy & Roadmap Consulting
AI Summary
“A-CX is a technology partner delivering secure, AI-driven software development, cloud infrastructure, and UX design services, specializing in modernizing enterprises with practical AI workflow integration and cybersecurity.”
The Himalayan Company
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Main specifications: -
Highlights
$5,000+
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
20% Mobile App Development (iOS & Android)
10% Legacy System Modernization
50% Machine Learning Model Development
AI Summary
“The Himalayan Company specializes in diverse business activities, leveraging broad capabilities to serve multiple sectors with professionalism and a focus on quality and innovation.”
Paper Clouds
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We are a group of experienced web design and development experts who specialize in launching new software products. We take care of the technical aspects, allowing you to concentrate on your business.
Highlights
$25,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Portsmouth, New Hampshire, Us
Services Provided
55% Custom Web Application Development
35% Mobile App Development (iOS & Android)
10% Legacy System Modernization
AI Summary
“Paper Clouds is a skilled web design and development team specializing in launching software products by managing technical details, enabling clients to focus on their core business.”
QRLise Private Limited
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QRLise is an advanced AI-powered digital transformation firm that assists industries in rethinking their operations by implementing intelligent, interconnected, and automated solutions. We focus on QR technology, digital twins, process automation, and artificial intelligence, developing customized p
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided+3 Services
18% Legacy System Modernization
33% Custom Web Application Development
15% Workflow Automation (Zapier / Make / n8n)
12% AI Strategy & Roadmap Consulting
AI Summary
“QRLise leverages AI-powered digital transformation, QR technology, digital twins, and process automation to deliver customized solutions for hospitality, manufacturing, and enterprise operations.”
Van Tech Systems LLC
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We excel at integrating outstanding Graphic Design, software development, effective Search Engine Marketing, and strategic Sales planning to elevate any business. With our team of experts, we provide a variety of solutions that ensure a distinctive user experience and focused outcomes. Our global re
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Indianapolis, Indiana, Us
Services Provided+1 Services
15% E-Commerce Development
20% Mobile App Development (iOS & Android)
40% Custom Web Application Development
15% QA & Software Testing
AI Summary
“Van Tech Systems LLC delivers tailored digital solutions, integrating software development, graphic design, SEO, and sales strategies to enhance business performance and user experiences globally.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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