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

Stackfy Tecnologia
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A Stackfy Tecnologia cria soluções digitais contemporâneas para empresas que desejam se expandir por meio da inovação. Desenvolvemos aplicações web, sistemas e automações que tornam os processos mais simples e aumentam a produtividade. Nossa prioridade é transformar ideias em produtos digitais efica
Highlights
2-9
Employees
Services Provided
60% Custom Web Application Development
25% E-Commerce Development
15% Legacy System Modernization
AI Summary
“Stackfy Tecnologia develops innovative digital solutions, including web applications and automation systems, to simplify processes and enhance productivity, transforming ideas into scalable, impactful products.”
Versatile Techno
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Versatile Techno is a leading company in web and mobile app development as well as Unity 2D/3D game app creation. Our team consists of skilled experts in web, mobile, and game development who are dedicated to delivering top-notch IT solutions. With a talented workforce of 60 developers and advanced
Highlights
< $25/hr
Avg Hourly Rate
10-49
Employees
Ahmedabad, Gujarat, In
Services Provided
45% Mobile App Development (iOS & Android)
10% E-Commerce Development
30% Custom Web Application Development
15% Legacy System Modernization
AI Summary
“Versatile Techno specializes in web, mobile, and Unity 2D/3D game development, offering expert IT solutions with a skilled team and advanced infrastructure for global clients.”
Rōnin Amsterdam
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We develop impactful designs that resonate with contemporary culture for brands seeking to elevate their presence. Our studio, situated in the heart of Amsterdam, offers views of The Rokin and Central Station square, embodying our cultural ethos and workflow. It is a modern, open environment where 3
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Amsterdam, North Holland, Nl
Services Provided+4 Services
12% Mobile App Development (iOS & Android)
10% E-Commerce Development
12% Legacy System Modernization
13% Product UX Strategy
AI Summary
“Rōnin Amsterdam blends expertise in branding, UI/UX design, and software development to deliver culturally attuned, innovative digital solutions that enhance brand identity and user experience.”
Haulmont Technology
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Haulmont Technology specializes in automation, mobile workforce applications, and algorithm-driven decision-making. We assist businesses in utilizing technology to eliminate operational hindrances, expand, and innovate in their markets through scalable tech solutions. Our offerings are developed wit
Highlights
$25,000+
Min Project Size
250-999
Employees
Podgorica, Me
Services Provided+1 Services
17% Custom Web Application Development
7% Legacy System Modernization
10% Mobile App Development (iOS & Android)
33% Other IT Consulting and SI
AI Summary
“Haulmont Technology delivers scalable, algorithm-driven business automation and mobile solutions using its proprietary Jmix framework, enabling rapid, cost-effective application development to help businesses innovate and grow globally.”
EPixelSoft®
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At EPixelSoft, we are dedicated to providing top-tier software solutions tailored to the specific needs of your business. With a strong emphasis on innovation, security, and scalability, our offerings are crafted to help you thrive in a rapidly changing digital environment. **Proven Expertise:** W
Highlights
$25,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Noida, Uttar Pradesh, In
Services Provided+4 Services
30% Software Development Services
10% Machine Learning Model Development
10% Cloud Consulting & SI
10% E-Commerce Development
AI Summary
“EPixelSoft delivers tailored, secure, and scalable software solutions across industries, leveraging advanced technologies and agile processes to enable global digital transformation and rapid market deployment.”
Logical Commander Software Ltd
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1) Risk HR: A software solution designed to identify, track, and mitigate various internal risks. 2) EmoRisk: The first and only tool for identifying, monitoring, and preventing psychosocial risks such as stress, burnout, and depression. Both systems operate in real-time and can save your organizati
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Tel Aviv-Yafo, Tel Aviv, Il
Services Provided
43% Custom Web Application Development
7% Legacy System Modernization
50% Operational Process Consulting
AI Summary
“Logical Commander Software Ltd. offers innovative, real-time risk management solutions like Risk HR and EmoRisk, effectively identifying and mitigating internal and psychosocial organizational risks while reducing associated costs.”
Stackslim
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We focus on delivering all the essential tools your B2B business requires to sell, serve, track, and operate efficiently – especially in a market where accessible solutions can be limited by factors such as industry, company size, or high costs. Our offerings include everyday tools like scheduling s
Highlights
$1,000+
Min Project Size
2-9
Employees
Loose, England, Gb
Services Provided
43% E-Commerce Development
7% Legacy System Modernization
50% ERP Consulting and SI
AI Summary
“Stackslim delivers tailored B2B tools like scheduling, expense tracking, and custom e-commerce sites, streamlining operations and reducing costs through integrated, brand-aligned software solutions.”
Code Creatives
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Code Creatives is a forward-thinking agency that specializes in creating top-notch software solutions. Our focus is on designing and developing advanced web-based applications. We aim to deliver solutions that are secure, dependable, and efficient.
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Multan, Pk
Services Provided
43% Custom Web Application Development
7% Legacy System Modernization
50% Web App UI Design
AI Summary
“Code Creatives is a forward-thinking agency specializing in designing and developing advanced, secure, and efficient web-based software solutions with reliability and innovation.”
Databrew
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We support researchers in both academic and industrial settings by helping them analyze, interpret, and share their data through consulting and educational initiatives. Additionally, we focus on statistical analysis, machine learning, data visualization, and the development of R Shiny dashboards. We
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Gainesville, Florida, Us
Services Provided
50% BI & Big Data Consulting & SI
43% Custom Web Application Development
7% Legacy System Modernization
AI Summary
“Databrew provides consulting and educational services to support data analysis, statistical methods, machine learning, visualization, and clear reporting for academic and industrial researchers.”
littlecode
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We are a group of software engineers, technology lovers, and IT consultants focused on creating custom software solutions. Our team boasts solid engineering and business expertise, and Littlecode is dedicated to delivering dependable, high-quality business solutions aimed at helping our clients stre
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Split, Split Dalmatia, Hr
Services Provided+5 Services
25% Custom Web Application Development
15% Mobile App Development (iOS & Android)
10% Legacy System Modernization
13% AI Strategy & Roadmap Consulting
AI Summary
“Littlecode is a team of software engineers and IT consultants delivering custom, high-quality software solutions that streamline workflows, automate processes, and enhance business competitiveness.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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