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

NCompas Technology Solutions Inc.
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At NCompas Technology Solutions, we have a clear mission: to empower organizations to fully harness Data and AI for significant business results. Based in Ohio with a rapidly expanding international team, we cater to mid-market and enterprise clients, particularly in the retail, finance, and healthc
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Cleveland, Ohio, Us
Services Provided+7 Services
25% Software Development Services
10% AI Agent & Multi-Agent System Development
10% Machine Learning Model Development
10% Cloud Consulting & SI
AI Summary
“NCompas Technology Solutions Inc. excels in custom web and mobile app development with a strong emphasis on cloud consulting, delivering scalable and secure enterprise solutions within Microsoft and other cloud ecosystems.”
DX Heroes
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You know your users, and we know developers. By collaborating, we simplify the adoption of your product and contribute to its success.
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Prague, Cz
Services Provided
40% Custom Web Application Development
10% Legacy System Modernization
30% Go-to-Market Strategy
20% Operational Process Consulting
AI Summary
“DX Heroes specializes in enhancing developer engagement by collaborating with companies to simplify product adoption, thereby contributing to user satisfaction and overall product success.”
Upverse Co.
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At Upverse, we assist startups and established businesses in turning their concepts into innovative, powerful products. As a comprehensive AI and software development partner, we focus on creating scalable digital solutions that foster innovation, automation, and business expansion. Our experienced
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Lahore, Pk Punjab, Pk
Services Provided+5 Services
10% Legacy System Modernization
10% Mobile App Development (iOS & Android)
14% Custom Web Application Development
3% Workflow Automation (Zapier / Make / n8n)
AI Summary
“Upverse partners with startups and enterprises to deliver AI-driven, scalable software solutions, encompassing product development, automation, and digital transformation for future-ready business growth.”
Chapter247 Infotech
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Chapter247 Infotech is a comprehensive software partner with over a decade of experience, focused on creating tech solutions by integrating Web, IoT, Analytics, AI, and Cloud technologies. Our clientele spans from large enterprises and mid-sized companies to startups. We excel in delivering forward-
Highlights
$10,000+
Min Project Size
< $25/hr
Avg Hourly Rate
50-249
Employees
Indore, Madhya Pradesh, In
Services Provided+3 Services
15% Custom Web Application Development
13% Mobile App Development (iOS & Android)
7% E-Commerce Development
10% API Development & Integration
AI Summary
“Chapter247 Infotech delivers innovative software solutions across sectors using Web, IoT, AI, and Cloud technologies, specializing in product engineering, enterprise applications, and digital transformation services.”
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Optimum Consultancy Services
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Optimum is a consulting firm specializing in Software and Cloud Solutions and Services, dedicated to transforming businesses through the integration of People, Innovative Technology, and Automated Processes. Leveraging our extensive expertise in strategic planning, process optimization, and cutting-
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Houston, Texas, Us
Services Provided+2 Services
13% API Development & Integration
20% Custom Web Application Development
7% Legacy System Modernization
10% ERP & CRM Development
AI Summary
“Optimum Consultancy Services delivers comprehensive software and cloud solutions, integrating innovative technology and automation to optimize business processes, enhance efficiency, and support digital transformation across industries.”
This Is Software
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We are a research and development, as well as a software development company powered by AI, characterized by a familial culture and extensive knowledge in creating custom digital solutions. We have a well-documented history of success in the E-commerce/Retail and Logistics/Transportation sectors. Cl
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Harpenden, England, Gb
Services Provided+2 Services
25% Custom Web Application Development
15% SaaS Product Development
10% Legacy System Modernization
20% AI Strategy & Roadmap Consulting
AI Summary
“This Is Software is an AI-powered R&D and software development firm delivering custom digital solutions, excelling in e-commerce and logistics, and enabling businesses to integrate AI for automation and analytics.”
Softray Solutions LLC
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Softray Solutions, located in Atlanta, has a development team situated in central Europe, providing top-notch development services at competitive prices that foster investment in technology and innovation. Our approach emphasizes partnership, making software development easier, smarter, more transpa
Highlights
50-249
Employees
Sarajevo, Federation Of Bosnia And Herzegovina, Ba
Services Provided+2 Services
25% Custom Web Application Development
15% Mobile App Development (iOS & Android)
10% Legacy System Modernization
15% Product UX Strategy
AI Summary
“Softray Solutions delivers high-quality, secure software development services from Atlanta and Central Europe, specializing in agile-driven web, mobile, cloud migration, and digital transformation solutions.”
FINGO Software House
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As a fintech-focused software company, we have been operating for 20 years. Since 2007, our banking reporting solutions have been utilized by commercial banks in Poland and across Europe, as well as over 550 cooperative banks, regulatory bodies, and two central banks in Central Europe. Our enduring
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Wroclaw, Pl
Services Provided+4 Services
20% Custom Web Application Development
5% E-Commerce Development
18% API Development & Integration
8% Legacy System Modernization
AI Summary
“FINGO Software House, a 20-year fintech software expert, specializes in custom solutions, enterprise modernization, and AI services, emphasizing reliability, innovation, and human-centric collaboration across financial sectors.”
BGTS
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BGTS is a company that offers software and technology services, supported by a team of over 1,800 professionals. With three decades of expertise in digital transformation, engineering, technology consulting, and enterprise service management, we help our clients succeed by blending engineering knowl
Highlights
$50,000+
Min Project Size
1000-9999
Employees
London, England, Gb
Services Provided+10 Services
13% Backend Development
8% Legacy System Modernization
12% Custom Web Application Development
7% DevOps Engineering
AI Summary
“BGTS is a global software and technology services firm with over 1,800 professionals, specializing in digital transformation, engineering, and consulting to deliver client-focused, award-winning solutions.”
launchOptions
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launchOptions is a reliable software development partner with more than 5 years of experience and deep expertise in various domains. Our team of talented software engineers develops outstanding products for industries such as Human Resources, Logistics and Transportation, Food and Beverage, and Urba
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Larnaka, Cy
Services Provided+5 Services
8% Mobile App Development (iOS & Android)
7% Custom Web Application Development
7% Backend Development
5% Frontend Development
AI Summary
“launchOptions delivers expert software development services across industries like HR and Logistics, specializing in mobile, web, cloud, UI/UX, and quality assurance with diverse technologies.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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