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

Handmade Software
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AWS, server-side development, Python, Django framework, Go programming language, middleware solutions, application programming interfaces, cloud computing, and RESTful services.
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided+2 Services
10% Custom Web Application Development
15% Backend Development
13% API Development & Integration
5% Legacy System Modernization
AI Summary
“Handmade Software delivers custom software development, backend and cloud solutions, AI-driven applications, and comprehensive testing using Python, Go, Django, RESTful APIs, and modern cloud platforms.”
Success Software Services
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Established in 2012, Success Software Services has rapidly emerged as a top global provider of digital consulting and software development services. Our delighted clients are located across four continents and represent a variety of industries. With premier delivery centers in metropolitan Ho Chi Mi
Highlights
$25,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Services Provided+6 Services
8% Legacy System Modernization
10% Mobile App Development (iOS & Android)
13% API Development & Integration
3% Blockchain & Web3 Development
AI Summary
“Success Software Services, established in 2012 in Vietnam, offers global digital consulting and software development with certified, Agile teams serving diverse industries across four continents.”
COPODS DESIGN TECHNOLOGY SOLUTIONS LLP
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Crafting Exceptional Experiences, Developing Strong Brands. — Copods is a digital services and consulting firm that values collaboration with brands focused on delivering outstanding product or service experiences, which are essential for standing out and achieving success. We have empowered numerou
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+1 Services
30% Mobile App UI Design
20% Web App UI Design
25% Mobile App Development (iOS & Android)
20% Custom Web Application Development
AI Summary
“Copods Design Technology Solutions LLP is a digital services and consulting firm specializing in experience design and front-end engineering to enhance brand engagement and digital product success.”
PraestansSolutions
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PraestansSolutions is an innovative software outsourcing and consulting firm that boasts top talents from around the globe. We assist businesses in enhancing their services and systems using the latest technologies. Rather than merely performing data entry, we are a team focused on solving problems.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Iasi, Iasi, Ro
Services Provided+6 Services
10% Custom Web Application Development
7% Mobile App Development (iOS & Android)
5% API Development & Integration
5% Backend Development
AI Summary
“PraestansSolutions is a global software outsourcing and consulting firm delivering innovative, high-quality solutions by leveraging diverse talents to enhance business services and systems efficiently.”
Renderbit Technologies
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Renderbit Technologies is a startup focused on providing software services that address real-world challenges in various industries by implementing advanced technologies like Blockchain, AI & ML, IoT, and RPA. We have partnered with numerous IT companies and startups to deliver solutions within tigh
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Rajpur Sonarpur, West Bengal, In
Services Provided+10 Services
18% Custom Web Application Development
5% Mobile App Development (iOS & Android)
10% API Development & Integration
3% Legacy System Modernization
AI Summary
“Renderbit Technologies delivers scalable, cloud-based software solutions leveraging Blockchain, AI, IoT, and RPA, partnering with startups to efficiently address diverse industry challenges using agile development.”
OTAKOYI
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At OTAKOYI, we are committed to improving the technology industry, starting with our own practices. When you choose to work with us, you gain a reliable partner to help you navigate the challenges and opportunities presented by the constantly changing tech environment. Our collaboration goes beyond
Highlights
$50,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Lviv, Lviv, Ua
Services Provided+15 Services
8% Custom Web Application Development
5% Mobile App Development (iOS & Android)
4% Backend Development
3% Frontend Development
AI Summary
“OTAKOYI is a technology partner committed to transparency and collaboration, delivering comprehensive services and fostering lasting relationships with global industry leaders to drive project success.”
P
Pragmatic AI
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Consulting and software development services focused on incorporating AI into your business. We prioritize practical engineering solutions over exaggerated claims about AI.
Highlights
$50-99/hr
Avg Hourly Rate
Kyiv, Ua
Services Provided+4 Services
13% AI Strategy & Roadmap Consulting
10% LLM Integration & Prompt Engineering
7% Custom AI Chatbot Development
10% Machine Learning Model Development
AI Summary
“Pragmatic AI offers consulting and software development services specializing in practical AI integration, delivering effective engineering solutions tailored to enhance business operations without hype.”
Tecknoworks
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Tecknoworks is committed to supporting a new generation of CEOs and CTOs who recognize that technology plays a crucial role in gaining a competitive edge. Our established methodology identifies the precise digital solution necessary to achieve your organizational and strategic goals, featuring tailo
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Cluj-Napoca, Cluj, Ro
Services Provided+20 Services
4% Backend Development
3% Code Review & Technical Audits
3% ERP & CRM Development
3% Mobile App Development (iOS & Android)
AI Summary
“Tecknoworks specializes in delivering tailored digital solutions and innovations that empower CEOs and CTOs to enhance organizational efficiency and maintain competitive advantage.”
Proximate.dev
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We are pleased to offer our comprehensive services through senior professionals who possess extensive expertise in custom software and product development for enterprises. Our front-end development primarily utilizes Angular and React, while the back-end is built on Java and Node.js, running in the
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Budapest, Budapest, Hu
Services Provided+4 Services
10% Frontend Development
3% Legacy System Modernization
10% Backend Development
7% Custom Web Application Development
AI Summary
“Proximate.dev delivers high-quality custom software, UI/UX design, AI, and cloud automation solutions using modern technologies like Java, Angular, and AWS for diverse enterprise sectors.”
The Devs
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The Devs is a software development consultancy located in São José dos Campos, Brazil, catering to startups and small to medium-sized enterprises throughout Vale do Paraíba. We focus on creating custom software, AI-driven automation, landing pages, and corporate websites utilizing Next.js, React, No
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Sao Jose dos Campos, Sao Paulo, Br
Services Provided+4 Services
20% Custom Web Application Development
10% API Development & Integration
3% Legacy System Modernization
10% AI Strategy & Roadmap Consulting
AI Summary
“The Devs is a Brazilian software consultancy specializing in custom software, AI automation, and web development, delivering scalable digital solutions to startups and SMEs in Vale do Paraíba.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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