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

Intechnity Sp. z o.o.
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We are a software development company dedicated to creating bespoke software solutions from scratch. Our streamlined team produces excellent results swiftly—minimizing excess costs—providing exceptional value in the market. We develop mobile, web, and desktop applications, managing the entire develo
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided+5 Services
13% Mobile App Development (iOS & Android)
13% Custom Web Application Development
5% API Development & Integration
2% Legacy System Modernization
AI Summary
“Intechnity Sp. z o.o. specializes in bespoke mobile, web, and desktop software development, delivering scalable, reliable solutions through streamlined processes with a focus on value and client collaboration.”
Abdalla Zukralla
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With over 10 years of experience in the technology sector, my primary aim is to provide high-quality services that ensure customer satisfaction and foster strong business relationships both in Jordan and globally. As a skilled Web Developer, I specialize in professional website design, desktop appli
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
Amman, Amman, Jo
Services Provided+4 Services
14% Custom Web Application Development
8% Frontend Development
7% Backend Development
3% CMS Development & Customization
AI Summary
“Abdalla Zukralla is an experienced technology professional specializing in web development, desktop applications, network administration, maintenance, and cybersecurity, delivering high-quality services globally.”
Techtinium
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We offer customized software solutions tailored to your specific needs, regardless of the project size. Our approach focuses on understanding your unique requirements to establish a lasting, trust-based partnership. Founded in 2008, Techtinium Technologies boasts a talented team of experienced profe
Highlights
$5,000+
Min Project Size
< $25/hr
Avg Hourly Rate
50-249
Employees
Chennai, Tamil Nadu, In
Services Provided+6 Services
9% Custom Web Application Development
5% Mobile App Development (iOS & Android)
6% API Development & Integration
3% E-Commerce Development
AI Summary
“Techtinium provides customized software development solutions worldwide, partnering with diverse clients to enhance operations, communication, and revenue through expert technology services since 2008.”
20tab
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We are a product team composed of IT professionals, developers, product managers, designers, and marketing and digital communication experts. Our focus is on creating top-tier digital products that are poised for market growth. By employing Lean, Agile, and Design Thinking methodologies, we enhance
Highlights
$50,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Rome, Lazio, It
Services Provided+17 Services
3% E-Commerce Development
10% Custom Web Application Development
6% Mobile App Development (iOS & Android)
1% Legacy System Modernization
AI Summary
“20tab is a multidisciplinary product team specializing in custom software, mobile, and web applications, combining Agile, Lean, and Design Thinking to accelerate digital product development for diverse clients.”
HawkenIO
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We create transformative products for top-tier companies. Are you in the process of developing a new product or aiming to accelerate your growth? Many developers lack the knowledge required to create and launch new products from the ground up, leading to escalating costs and wasted time. However, we
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Irvine, California, Us
Services Provided+10 Services
20% Custom Web Application Development
5% Blockchain & Web3 Development
5% Legacy System Modernization
20% Mobile App Development (iOS & Android)
AI Summary
“HawkenIO delivers expert software development and AI solutions, crafting custom web, mobile, blockchain, and AI-driven products for startups and Fortune 500 clients to accelerate growth.”
Olive Mid East
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Olive is a prominent provider of enterprise and digital solutions, specializing in website development, portal creation, enterprise solutions such as SAP and SharePoint, application development, mobility services, hosting, and IT consulting. The company holds certifications as a Microsoft and SAP EB
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
New Delhi, Delhi, In
Services Provided+5 Services
8% ERP & CRM Development
4% QA & Software Testing
5% Frontend Development
5% Backend Development
AI Summary
“Olive Mid East is a certified provider of enterprise and digital solutions across UAE, Oman, and India, offering development, consulting, and integration services to diverse sectors.”
Fathom Software LLC
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At Fathom Software LLC, we leverage our extensive business expertise and technical skills to develop high-quality, scalable applications and platforms that endure over time.
Highlights
$50,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+4 Services
5% Frontend Development
4% Mobile App Development (iOS & Android)
4% Legacy System Modernization
7% Custom Web Application Development
AI Summary
“Fathom Software LLC combines deep business insight and technical expertise to develop high-quality, scalable software applications and platforms designed for long-term reliability and performance.”
IDEATI
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Our emphasis is on meeting our clients' goals and enhancing value by delivering innovative and effective solutions. With the support of a highly skilled and experienced international team, along with advanced techniques and tools, we offer exceptional quality in our products and services.
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Panama City, Pa
Services Provided+4 Services
6% Frontend Development
9% Backend Development
9% Custom Web Application Development
1% Legacy System Modernization
AI Summary
“IDEATI delivers innovative, high-quality solutions through an experienced international team, leveraging advanced tools to meet client goals and enhance value across diverse projects.”
IKBO
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Contamos con más de 9 años de experiencia en el mercado colombiano y europeo, y nos especializamos en ofrecer servicios contables, fiscales, laborales, legales y tecnológicos. Nos hemos establecido como un socio estratégico que comprende los retos que enfrentan las empresas y proporciona soluciones
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Bogota, Co
Services Provided+7 Services
20% Custom Web Application Development
5% Legacy System Modernization
13% ERP & CRM Development
8% Mobile App Development (iOS & Android)
AI Summary
“IKBO offers integrated accounting, legal, fiscal, labor, and technological services, leveraging 9+ years' expertise and innovative digital tools to support strategic business growth.”
ITUniversum
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ITUniversum is a company specializing in custom software development and quality assurance. We design tailored websites and mobile applications to help businesses transition into effective digital entities. Our services cover the entire product development lifecycle. You can engage a team of expert
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Jericho, New York, Us
Services Provided+8 Services
8% Custom Web Application Development
7% Mobile App Development (iOS & Android)
3% Legacy System Modernization
5% Backend Development
AI Summary
“ITUniversum specializes in custom software development and quality assurance, offering tailored digital solutions and expert teams to drive business transformation through strategic, innovative technology.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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