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

Optimusflow
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Optimusflow is a software development and outsourcing firm located at Teknopark Istanbul, dedicated to providing custom digital solutions for businesses across Europe. Since our establishment in 2010, we have collaborated with organizations in highly regulated sectors such as banking, capital market
Highlights
$25-49/hr
Avg Hourly Rate
2-9
Employees
Istanbul, Tr
Services Provided+2 Services
15% Custom Web Application Development
10% Mobile App Development (iOS & Android)
13% API Development & Integration
2% E-Commerce Development
AI Summary
“Optimusflow delivers tailored software development and outsourcing services, specializing in enterprise-grade solutions for regulated industries, enhancing business efficiency, scalability, and digital transformation across Europe.”
Cleartelligence
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We enable organizations to enhance their decision-making processes by adopting the latest data infrastructure. Our consultants provide comprehensive analytics services and accelerate digital transformation for your company. Our clients gain from our focus on delivering solutions that support complet
Highlights
50-249
Employees
Newton, Massachusetts, Us
Services Provided+5 Services
10% AI Strategy & Roadmap Consulting
10% BI & Big Data Consulting & SI
3% IT Staff Augmentation
3% Cloud Consulting & SI
AI Summary
“Cleartelligence delivers comprehensive analytics, AI, cloud infrastructure, software development, and consulting services, enabling organizations to optimize data-driven decision-making and accelerate digital transformation across industries.”
Now Compiler
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We are a consulting firm focused on IT services, specializing in implementation solutions based on the ServiceNow platform. Our strengths include offering in-depth technical consulting and solution architecture services specifically designed for the ServiceNow environment.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+7 Services
1% Generative AI
8% Other IT Consulting and SI
1% Machine Learning Model Development
1% LLM Integration & Prompt Engineering
AI Summary
“Now Compiler is an IT consulting firm specializing in ServiceNow platform solutions, providing expert technical consulting and solution architecture services to optimize implementations.”
Seaflux
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Seaflux Technologies enables innovative small and medium-sized businesses to leverage state-of-the-art technology with tailored, affordable solutions. We provide a wide range of digital transformation services, such as advanced AI, data analytics, blockchain, DevOps, cloud computing, and custom soft
Highlights
$25,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Austin, Texas, Us
Services Provided+4 Services
10% Generative AI
8% Custom AI Chatbot Development
10% Machine Learning Model Development
5% Conversational AI & Voice Assistant Development
AI Summary
“Seaflux Technologies delivers tailored digital transformation solutions for small and medium businesses, specializing in AI, blockchain, cloud computing, and custom software development to drive innovation and growth.”
Reporteq
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We create tailor-made applications. Reporteq has successfully provided over 600 comprehensive software solutions to pleased clients, ranging from small and medium-sized businesses to large enterprises.
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Carlsbad, California, Us
Services Provided+1 Services
25% Custom Web Application Development
10% Mobile App Development (iOS & Android)
8% E-Commerce Development
7% Legacy System Modernization
AI Summary
“Reporteq delivers over 600 customized software solutions, serving diverse clients from small businesses to large enterprises with professionally tailored applications and services.”
Morrow
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Morrow is an agency focused on app development, with a specialization in multi-platform development using React Native. While our headquarters are located in Bristol, UK, our talented team primarily operates remotely and consists of members from around the globe. React Native enables simultaneous ap
Highlights
$10,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Bristol, England, Gb
Services Provided+2 Services
30% Mobile App Development (iOS & Android)
5% E-Commerce Development
10% Frontend Development
5% Legacy System Modernization
AI Summary
“Morrow is a UK-based digital agency specializing in React Native multi-platform app development, combining strategic UX/UI design and enterprise modernization to deliver scalable, user-friendly digital solutions.”
Xenon Apps
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Xenon Apps, a skilled app development firm, takes pride in its proficient team that delivers solid app development solutions. Whether you're a startup aiming to create a strong online presence or a seasoned business, we offer customized solutions to meet your diverse needs. Our app development servi
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Services Provided
15% API Development & Integration
10% E-Commerce Development
65% Mobile App Development (iOS & Android)
10% Legacy System Modernization
AI Summary
“Xenon Apps is a Miami-based app development firm delivering customized, efficient, and responsive solutions across diverse platforms, serving startups and established businesses throughout Florida.”
FrontEndART Software Ltd.
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FrontEndART Ltd. carries out globally acknowledged research and creates cutting-edge products and professional services focused on source code quality assurance and testing for software development and operation companies. The company's founders are esteemed experts and faculty members at the Depart
Highlights
$25-49/hr
Avg Hourly Rate
50-249
Employees
Szeged, Csongrad Csanad, Hu
Services Provided
25% Custom Web Application Development
15% Mobile App Development (iOS & Android)
10% Legacy System Modernization
50% QA & Software Testing
AI Summary
“FrontEndART Software Ltd. specializes in advanced source code quality assurance and testing solutions, backed by expert research and academic leadership to support software development and operations globally.”
Ai2
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For more than thirty years, Ai2 has been the top provider of advanced mobile order management solutions for wholesale distributors of fast-moving products. No other company globally has matched our experience or quality. Ai2 handles a higher number of mobile sales orders annually, both in terms of r
Highlights
$10,000+
Min Project Size
$150+/hr
Avg Hourly Rate
10-49
Employees
Chicago, Illinois, Us
Services Provided
25% Custom Web Application Development
15% E-Commerce Development
50% Mobile App Development (iOS & Android)
10% Legacy System Modernization
AI Summary
“Ai2 has over 30 years' expertise delivering advanced mobile order management and custom software solutions, excelling in web, e-commerce, and mobile app development for wholesale distributors.”
Edgar Allan
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Edgar Allan is a recognized Webflow Enterprise Partner agency that operates at the crossroads of branding and performance. We assist mid-market and enterprise companies in transitioning from brand clarity to conversion. In the age of AI, a powerful brand is not only about effective positioning; it's
Highlights
$50,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
50-249
Employees
Atlanta, Georgia, Us
Services Provided+4 Services
13% Product UX Strategy
8% UX Research & Usability Testing
5% Wireframing & Prototyping
15% Brand Identity Design
AI Summary
“Edgar Allan is a Webflow Enterprise Partner agency specializing in branding and performance, helping mid-market and enterprise companies enhance brand clarity and drive conversions effectively.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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