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

UnitedOver, LLC
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I have experience working on the widely-used plugins Digits and WPNotif for WordPress, which are utilized by over 200,000 websites worldwide. Additionally, I served as the lead engineer for Android applications that have achieved over 1 million downloads. My key strengths include: - Project Planni
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided+3 Services
15% Custom Web Application Development
30% Mobile App Development (iOS & Android)
5% E-Commerce Development
5% Legacy System Modernization
AI Summary
“UnitedOver, LLC specializes in web and app development, offering expertise in project planning, API integration, DevOps, and scalable solutions for high-performance applications worldwide.”
ATOM Systems Private Limited
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We are a skilled design and development company seeking new clients, with expertise in GO language, Python, MEAN/MERN, and LAMP stack. With 12 years of experience in the IT industry, we have successfully delivered web and mobile applications. Our specialization lies in native iOS and Android develop
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Coimbatore, Tamil Nadu, In
Services Provided+11 Services
8% Graphic Design
6% Logo Design
4% Packaging Design
2% Print Design
AI Summary
“ATOM Systems Private Limited delivers comprehensive IT solutions encompassing brand identity, UX/UI design, custom app development, data analytics, and AI-driven automation, leveraging diverse technologies with 12 years' industry experience.”
Decnic Systems
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*UP TO 50% DISCOUNTS AVAILABLE!* Reach out via Global Skype (call/message) at Decnicsystems@gmail.com, or contact us on WhatsApp at +918700851650. You can also email us at itservices@decnic.com or visit our website at https://decnic.com. At DECNIC, an experienced IT technology partner, we offer a wi
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided+15 Services
3% Legacy System Modernization
5% Backend Development
6% Custom Web Application Development
3% E-Commerce Development
AI Summary
“Decnic Systems is an experienced IT partner offering software development, cloud infrastructure, AI & automation, data analytics, cybersecurity, and digital marketing services to optimize client IT investments.”
Vaevi Technologies
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Established in 2020, Vaevi is made up of a skilled team specializing in customized software solutions designed to boost productivity and promote business development. We have assembled a diverse group of experts who consistently surpass client expectations by delivering exceptional results. Our main
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+19 Services
5% Legacy System Modernization
4% CMS Development & Customization
7% API Development & Integration
12% Custom Web Application Development
AI Summary
“Founded in 2020, Vaevi Technologies delivers customized, high-quality software solutions across multiple sectors, enhancing productivity and helping leaders address challenges while adapting to dynamic business needs.”
Siri9 Technology Company Limited
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Siri9 was established with a profound awareness of the technological demands of businesses and focuses on providing effective, straightforward technology solutions. Our goal is to assist businesses in optimizing their operations, achieving swift growth, and maintaining long-term success by leveragin
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided+8 Services
9% Custom Web Application Development
3% E-Commerce Development
5% Mobile App Development (iOS & Android)
6% API Development & Integration
AI Summary
“Siri9 Technology provides adaptable AI and cloud-based solutions to optimize business operations, foster growth, and ensure long-term success in competitive markets.”
ICIEOS
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ICIEOS assists startups and businesses in turning their ideas into scalable software solutions. Our clients rely on us for our dependability, creativity, and comprehensive engineering services from initial concept through to deployment. We serve various industries, including technology, retail, educ
Highlights
$5,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Services Provided+8 Services
10% Mobile App Development (iOS & Android)
7% E-Commerce Development
3% Legacy System Modernization
7% API Development & Integration
AI Summary
“ICIEOS partners with startups and businesses across multiple industries to develop scalable software solutions, offering reliable and creative engineering services from concept to deployment.”
Ahime
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Ahime est une société spécialisée dans la création de solutions digitales personnalisées, alliant savoir-faire technique, créativité et innovation. Que vous soyez une jeune entreprise ou une enseigne bien établie, nous vous accompagnons à chaque étape de votre transition numérique. Nos Services incl
Highlights
2-9
Employees
Abomey-Calavi, Bj
Services Provided+4 Services
8% API Development & Integration
20% Custom Web Application Development
15% Mobile App Development (iOS & Android)
5% E-Commerce Development
AI Summary
“Ahime designs tailored digital solutions, offering web and mobile development, no-code platforms, UX/UI design, and digital transformation consulting to support businesses' digital evolution.”
Woodsoft Solutions LLC
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Woodsoft Solutions is a technology partner that focuses on custom software development, IT consulting, and staff augmentation. We assist businesses in creating scalable web, mobile, and enterprise solutions that effortlessly fit into their digital environment. With our adaptable approach, skilled in
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided+7 Services
9% Custom Web Application Development
6% API Development & Integration
3% Legacy System Modernization
4% Frontend Development
AI Summary
“Woodsoft Solutions specializes in custom software development, IT consulting, and staff augmentation, delivering scalable digital solutions to support business innovation and growth globally.”
Prime Cryptronics
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**Prime Cryptronics | Secure. Scalable. Software Solutions.** Prime Cryptronics is a veteran-owned firm specializing in software development and technology consulting, dedicated to creating secure, scalable, and high-performance systems. Founded by engineer Erik Anderson, we assist startups, enter
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided+4 Services
18% Backend Development
15% Custom Web Application Development
12% Blockchain & Web3 Development
5% Legacy System Modernization
AI Summary
“Prime Cryptronics, a veteran-owned U.S. firm, delivers secure, scalable software solutions and technology consulting across fintech, healthcare, and logistics, emphasizing security and agile development.”
Halosys Technologies
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Halosys focuses on iOS, Android, Titanium, HTML5, BlackBerry, and Drupal CMS. The company converts real-life situations into online and mobile solutions through a distinctive combination of creativity, expertise, and technology. As the mobile web experiences extraordinary growth worldwide, Halosys i
Highlights
50-249
Employees
New Delhi, Delhi, In
Services Provided+5 Services
20% Mobile App Development (iOS & Android)
15% Custom Web Application Development
8% E-Commerce Development
5% QA & Software Testing
AI Summary
“Halosys Technologies delivers comprehensive mobile and web application development services across multiple platforms, combining creativity and technology to enhance client ROI and competitive edge.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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