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

qoliber
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Qoliber, previously known as Q-Solutions Studio, is a certified software development company and one of only two GOLD Partners for Hyvä in Poland (Europe). We specialize in eCommerce technologies, including Magento 1, Magento 2, Shopware, and Hyvä implementations, and work with international clients
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Poznan, Greater Poland, Pl
Services Provided+1 Services
50% E-Commerce Development
20% Backend Development
15% Frontend Development
10% Custom Web Application Development
AI Summary
“Qoliber is a certified software development company and Hyvä GOLD Partner in Poland, delivering high-quality eCommerce solutions including Magento, Shopware, and Hyvä for global clients.”
Vector
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Vector is a team that specializes in backend and Liferay development. In addition to Liferay, we provide comprehensive web and mobile software development services. Established in Estonia and Ukraine, with a new office set to open in Bulgaria, Vector has been delivering web and portal solutions that
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided
65% Backend Development
25% API Development & Integration
10% Legacy System Modernization
AI Summary
“Vector is a software development company specializing in backend and Liferay solutions, delivering corporate web and mobile portals primarily for Norwegian and German markets since 2018.”
DevPlant
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We are a group of software architects, developers, testers, and designers with a wealth of experience in producing high-quality software products. Our key advantage lies in our deep understanding of our clients' unique business objectives, which allows us to choose the most suitable technology to im
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Timisoara, Timis, Ro
Services Provided
12% Legacy System Modernization
28% Custom Web Application Development
10% Mobile App Development (iOS & Android)
50% AI Model Fine-Tuning & Training
AI Summary
“DevPlant delivers customized software solutions across sectors including Finance, IoT, and Food, leveraging expert development and deep client understanding to meet varied project scales and complexities.”
SystemSeed
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We are a digital agency that focuses on web development, strategy, training, and support in Drupal and React, with an emphasis on social impact. At SystemSeed, we assist high-impact organizations in achieving their goals through web technology. Handling complex projects is our everyday specialty. Wh
Highlights
$25,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Barcelona, Catalonia, Es
Services Provided+3 Services
23% Custom Web Application Development
3% E-Commerce Development
7% Legacy System Modernization
14% Product UX Strategy
AI Summary
“SystemSeed is a digital agency specializing in Drupal and React web development, UX/UI design, and Agile training, serving diverse organizations to deliver high-quality, socially impactful technology solutions.”
Codanorm Solutions
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At Codanorm Solutions, we create software that streamlines operations and grows alongside your business. We provide secure, high-performance platforms that transform manual processes into automated, auditable systems. Our offerings include enterprise-level CRM systems, smart automation, and multi-te
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Kolkata, West Bengal, In
Services Provided+4 Services
12% Legacy System Modernization
17% Custom Web Application Development
5% API Development & Integration
13% CRM Consulting and SI
AI Summary
“Codanorm Solutions delivers secure, high-performance software platforms that automate operations and enhance growth for Real Estate, Financial Services, and Healthcare sectors with reliable cloud-native solutions.”
WAM DevTech, Inc.
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WAM DevTech is a consulting firm that focuses on technology solutions, particularly in enterprise architecture, cloud modernization, and custom software development for mid-sized and large clients. With over 25 years of experience in designing systems for sectors such as automotive, healthcare, gove
Highlights
$10,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Chantilly, Virginia, Us
Services Provided
22% API Development & Integration
12% Legacy System Modernization
33% Product UX Strategy
33% Cloud Consulting & SI
AI Summary
“WAM DevTech specializes in enterprise architecture, cloud modernization, and custom software development, delivering scalable, efficient technology solutions for mid-sized to large clients across diverse industries.”
Gyan Solutions
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Gyan Solutions collaborates with organizations focused on operations to enhance execution across planning, supply chain, and operational systems. We prioritize identifying operational bottlenecks before suggesting any technological solutions. Many businesses invest in software with the hope of impro
Highlights
$10,000+
Min Project Size
10-49
Employees
Mississauga, Ontario, Ca
Services Provided+5 Services
15% Custom Web Application Development
3% Mobile App Development (iOS & Android)
2% Blockchain & Web3 Development
13% Legacy System Modernization
AI Summary
“Gyan Solutions enhances organizational operations by analyzing workflows and aligning people, processes, and systems to improve execution through tailored integration, automation, and AI-driven support.”
Tuplescale Inc
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Our enthusiasm for creating effective products and solutions for our clients motivates us to innovate. We serve as a reliable partner for our clients and adopt a unified company approach. We prioritize what benefits both the client and the users.
Highlights
$5,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Services Provided
50% Custom Web Application Development
40% Mobile App Development (iOS & Android)
10% Legacy System Modernization
AI Summary
“Tuplescale Inc. is a client-focused company dedicated to delivering innovative, effective products and solutions through a unified approach, prioritizing benefits for both clients and users.”
Tech Simians
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Our team consists of experienced professionals who carefully tailor each project to meet the unique needs of our clients, guaranteeing prompt delivery, high quality, consistency, and flexibility. Additionally, our wide range of skilled resources enhances our capability to not only meet but exceed cl
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided+2 Services
14% Mobile App Development (iOS & Android)
10% Legacy System Modernization
10% API Development & Integration
20% Cloud Consulting & SI
AI Summary
“Tech Simians offers tailored solutions through skilled professionals, ensuring timely delivery, quality, and flexibility to exceed diverse client requirements efficiently.”
The Crafters Lab
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The Crafters Lab is a Barcelona-based software development studio that prioritizes high performance. They focus on Cloud and JavaScript technologies.
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Barcelona, Catalonia, Es
Services Provided
50% Custom Web Application Development
40% Backend Development
10% Legacy System Modernization
AI Summary
“The Crafters Lab is a Barcelona-based software studio specializing in high-performance solutions with expertise in Cloud and JavaScript technologies across diverse applications.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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