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

Qbitech
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Qbitech Solutions is a software development and consulting firm located in Novi Sad, Serbia. We focus on cutting-edge technologies to create innovative solutions for clients globally. Situated in a vibrant tech hub known for its creative thinkers, we founded Qbitech in 2021 with a distinct vision fo
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Novi Sad, Rs
Services Provided+9 Services
15% Custom Web Application Development
8% API Development & Integration
3% Legacy System Modernization
25% DevOps Engineering
AI Summary
“Qbitech Solutions, founded in 2021 in Serbia, delivers innovative software development, data analytics, AI automation, and cloud infrastructure services, specializing in FinTech and eCommerce sectors globally.”
Intelliants
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We are an agile team with the strength of a dozen professionals working on board. Our major force is our people and the efforts we put into designing effective solutions for our clients. At Intelliants, our job is to understand the requirements of your business and provide a cost-effective, solid, r
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Bishkek, Chuy, Kg
Services Provided+8 Services
8% Backend Development
3% Legacy System Modernization
6% API Development & Integration
4% Frontend Development
AI Summary
“Intelliants is a professional IT company specializing in PHP-based solutions, offering scalable website design and enterprise applications with Agile methodologies for long-term client partnerships.”
VST
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VST is a worldwide IT firm that offers strategic business solutions and services aimed at addressing issues of varying sizes across numerous industries, such as retail and e-commerce, healthcare, pharmaceuticals, insurance, banking and finance, oil and gas, and automotive sectors. Our extensive expe
Highlights
$25,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
50-249
Employees
New York, New York, Us
Services Provided+9 Services
8% Mobile App Development (iOS & Android)
4% Legacy System Modernization
8% Custom Web Application Development
6% Cloud Consulting & SI
AI Summary
“VST is a global IT firm delivering strategic, scalable, and secure web solutions across diverse industries, enhancing operational efficiency and driving business success through innovative technology and quality-focused services.”
Edvenswa Enterprises
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At Edvenswa, we focus on offering IT consulting services that assist our clients in improving their business processes. With a wide range of highly skilled in-house professionals and freelancers, we are able to provide exceptional services in numerous sectors such as 3PL, Finance, Healthcare, Transp
Highlights
50-249
Employees
San Jose, California, Us
Services Provided+11 Services
10% Mobile App Development (iOS & Android)
11% QA & Software Testing
4% Legacy System Modernization
8% UX Research & Usability Testing
AI Summary
“Edvenswa Enterprises offers comprehensive IT consulting, specializing in application design, development, testing, and infrastructure management across diverse sectors including finance and healthcare.”
Splice Digital Inc.
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Splice is an award-winning technology company located in Ontario, specializing in digital transformation and solutions across North America and beyond. With over 17 years of experience, we adopt a consultative and collaborative approach to partner with enterprises and mid-sized businesses, creating
Highlights
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided+1 Services
23% Custom Web Application Development
15% E-Commerce Development
5% Legacy System Modernization
7% Mobile App Development (iOS & Android)
AI Summary
“Splice Digital Inc. provides comprehensive digital transformation services including custom software development, AI-driven automation, CRM consulting, and system integration to enhance business operations and customer engagement across industries.”
Mango Stack
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At MangoStack, we create high-quality and dependable technology products using agile methodology.
Highlights
$5,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided+2 Services
20% Mobile App Development (iOS & Android)
18% E-Commerce Development
12% Legacy System Modernization
20% Product UX Strategy
AI Summary
“MangoStack develops reliable, high-quality technology products by leveraging agile methodologies, delivering innovative software solutions tailored to diverse client needs across various industries.”
Untold Studio
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Untold was founded to assist the companies we admire in developing the outstanding apps and websites they deserve. As seasoned professionals, we are committed to the unwavering pursuit of excellence. For us, this entails: Superior products. We never accept mediocrity and won’t release a product unti
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided+5 Services
30% Mobile App Development (iOS & Android)
30% Custom Web Application Development
10% Other IT Consulting and SI
5% Machine Learning Model Development
AI Summary
“Untold Studio excels in Software Development, delivering superior mobile and web applications with strong backend capabilities. Their expertise in enterprise modernization and support ensures robust, scalable solutions for diverse client needs.”
Check My Universe, LLC
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About Us Check My Universe is a company that specializes in software systems and design. We create software and applications tailored to your needs, allowing you to concentrate on other aspects of your business. We are proud to be a 100% woman-owned business in the technology sector. Mission Ou
Highlights
$250,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Frisco, Texas, Us
Services Provided+11 Services
7% QA & Software Testing
14% Custom Web Application Development
10% Mobile App Development (iOS & Android)
4% Legacy System Modernization
AI Summary
“Check My Universe, a 100% woman-owned tech company, delivers custom software, digital transformation, AI, and cloud services with a focus on purposeful impact and innovation.”
PSJ StrategyWerks LLP
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Strategywerks is a rapidly expanding IT agency focused on delivering results, specializing in web and mobile app development as well as software solutions. We assist startups and mid to large-sized companies, including both B2B and B2C businesses, in achieving their objectives through our effective
Highlights
$25-49/hr
Avg Hourly Rate
10-49
Employees
Gurugram, Haryana, In
Services Provided+8 Services
10% Custom Web Application Development
10% Mobile App Development (iOS & Android)
4% E-Commerce Development
3% Backend Development
AI Summary
“PSJ StrategyWerks LLP is a global IT agency delivering custom web and mobile app development, UI/UX, and graphic design services to enhance business growth and user engagement across diverse industries.”
SynergyLabs
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SYNERGYLABS is proud to be a tech partner for those who challenge the status quo and strive for excellence. When you collaborate with us, you'll have access to some of the top 1% of software engineers. We have partnered with over 50 businesses, many of which have become unicorns by addressing signif
Highlights
$25,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Gurugram, Haryana, In
Services Provided+7 Services
15% Custom Web Application Development
8% Mobile App Development (iOS & Android)
10% Backend Development
8% Frontend Development
AI Summary
“SynergyLabs delivers advanced AI-driven software development, blockchain, and enterprise modernization solutions, collaborating with diverse industries to implement innovative technologies through expert engineering and agile partnership.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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