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

B00st
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We gather experienced, committed teams of developers to assist rapidly expanding startups and forward-thinking companies in making an impact and reaching their objectives.
Highlights
$100,000+
Min Project Size
50-249
Employees
Jackson, Wyoming, Us
Services Provided+4 Services
15% Custom Web Application Development
12% Mobile App Development (iOS & Android)
3% Blockchain & Web3 Development
3% Legacy System Modernization
AI Summary
“B00st assembles skilled development teams to support innovative startups and companies, accelerating growth and achieving strategic goals through experienced technology expertise.”
AppWell.Health
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AppWell Health specializes in targeted healthcare technology. With over 20 years of experience in the industry, including software development, cybersecurity, and design, we assist healthcare product development companies in making design choices, accelerating time to market, creating excellent user
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+5 Services
15% Mobile App Development (iOS & Android)
13% Custom Web Application Development
10% Backend Development
7% Frontend Development
AI Summary
“AppWell Health delivers expert healthcare technology solutions, combining 20 years of software, cybersecurity, and design expertise to accelerate product development with high security and user experience.”
Nexes
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Nexes is an energetic software firm focused on providing all-encompassing IT solutions, as well as digital software, and web and app development services.
Highlights
$5,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided+5 Services
10% Custom Web Application Development
8% Mobile App Development (iOS & Android)
4% Legacy System Modernization
5% Frontend Development
AI Summary
“Nexes is a dynamic software company delivering comprehensive IT solutions, including digital software, web, and app development services to diverse clients.”
Codbel
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Codbel is experiencing significant growth in the technology development cycle, enabling the rapid release of innovative solutions. We are eager to transform the traditional idea of replacing conventional software with automated, cutting-edge solutions that prioritize security, integrity, and efficie
Highlights
$100,000+
Min Project Size
$150+/hr
Avg Hourly Rate
1000-9999
Employees
Palo Alto, California, Us
Services Provided+29 Services
4% Custom Web Application Development
3% Mobile App Development (iOS & Android)
2% E-Commerce Development
3% ERP & CRM Development
AI Summary
“Codbel delivers innovative, secure software solutions leveraging AI and data mining to enhance business profitability, streamline operations, and protect consumer data with cutting-edge technology.”
Thrillworks
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In essence, if it exists on a screen in the digital realm, we create it. We develop everything from websites and mobile applications to media campaigns and beyond, all designed with a human touch to engage your customers and quickly deliver a return on your digital investment.
Highlights
$250,000+
Min Project Size
50-249
Employees
Burlington, Ontario, Ca
Services Provided+11 Services
6% Mobile App Development (iOS & Android)
2% Legacy System Modernization
2% QA & Software Testing
4% Backend Development
AI Summary
“Thrillworks specializes in creating diverse digital solutions—from websites and mobile apps to media campaigns—focused on engaging users and delivering rapid digital investment returns.”
eWeaver Technologies Pvt Ltd
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**Shaping the Future of AI-Driven Full-Stack Development** At eWeaver, we go beyond simply creating websites; we design powerful digital solutions. Established by a CTO with more than 22 years of IT experience, eWeaver addresses the dilemma between speed and architectural robustness. While convent
Highlights
$1,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Services Provided+4 Services
10% AI Strategy & Roadmap Consulting
13% LLM Integration & Prompt Engineering
8% Custom AI Chatbot Development
20% Machine Learning Model Development
AI Summary
“eWeaver Technologies specializes in AI-driven full-stack development, delivering secure, scalable, and high-performance digital solutions rapidly with framework-agnostic flexibility and robust architecture.”
kmlcreative
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Kreatywne studio ma na celu wyróżnienie twojej firmy w sieci poprzez unikalną grafikę, nowoczesne strategie marketingowe oraz spersonalizowane podejście do każdego klienta.
Highlights
$25-49/hr
Avg Hourly Rate
Services Provided+2 Services
33% Social Media Marketing
14% Custom Web Application Development
13% Frontend Development
7% Legacy System Modernization
AI Summary
“KMLCreative is a creative studio specializing in unique graphic design, modern marketing strategies, and personalized client approaches to distinguish businesses online.”
Fortech Software Technology Inc.
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Fortech Software Technology is a premier engineering firm focused on creating intricate, scalable, and secure digital ecosystems. We connect hardware and software by offering comprehensive solutions that range from Embedded Systems (IoT) to Cloud-Native Software Development. Our primary areas of exp
Highlights
$50,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Istanbul, Tr
Services Provided+4 Services
23% Custom Web Application Development
18% API Development & Integration
8% Backend Development
2% Legacy System Modernization
AI Summary
“Fortech Software Technology Inc. delivers comprehensive engineering solutions, integrating embedded systems, cloud-native development, DevOps, and cybersecurity to drive secure, scalable digital transformation and operational excellence.”
SMR IT Solutions
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SMR IT Solutions is a digital agency dedicated to offering exceptional services tailored to your business requirements. Our experienced team of professionals delivers high-quality services in various domains. Our mission is to bring client concepts to life and achieve outstanding outcomes. We operat
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Mumbai, Maharashtra, In
Services Provided+10 Services
7% Custom Web Application Development
7% Mobile App Development (iOS & Android)
2% E-Commerce Development
1% Legacy System Modernization
AI Summary
“SMR IT Solutions is a digital agency providing tailored, high-quality IT services across various domains with a dedicated team focused on delivering client-driven outcomes around the clock.”
Rhino Partners
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Comprehensive Provider of Tailored Software Development and Data Analysis for Financial Technology
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Singapore, Singapore, Sg
Services Provided+2 Services
17% Mobile App Development (iOS & Android)
3% Legacy System Modernization
13% Custom Web Application Development
27% Other IT Consulting and SI
AI Summary
“Rhino Partners delivers customized software development and data analysis services specializing in financial technology, supporting diverse client needs with expert technological solutions.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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