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

Nada.ba
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Nada.ba is an IT firm located in Sarajevo. Our goal is to leverage the knowledge acquired from leading IT companies in Bosnia and Herzegovina to pursue ambitious aspirations. We focus on delivering the most effective IT solutions to our clients using a tailored and inventive approach. We continuousl
Highlights
$25-49/hr
Avg Hourly Rate
10-49
Employees
Sarajevo, Federation Of Bosnia And Herzegovina, Ba
Services Provided+11 Services
8% Mobile App Development (iOS & Android)
8% API Development & Integration
7% Legacy System Modernization
10% Custom Web Application Development
AI Summary
“Nada.ba is a Sarajevo-based IT firm delivering tailored, innovative solutions to diverse clients from startups to multinational companies, fostering professional growth and technological excellence.”
Dechsoft
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Dechsoft is a software development firm focused on creating intelligent and scalable digital solutions for businesses of any size. We provide a range of services, including custom web and mobile apps, system integrations, and automation tools, helping organizations enhance their operations and drive
Highlights
< $25/hr
Avg Hourly Rate
10-49
Employees
Services Provided+2 Services
18% Custom Web Application Development
15% Mobile App Development (iOS & Android)
10% API Development & Integration
5% E-Commerce Development
AI Summary
“Dechsoft delivers scalable, custom digital solutions including web and mobile applications, system integrations, and automation tools, empowering businesses to optimize operations and foster growth.”
OVSolutions
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We are an IT agency that offers valuable product solutions. Our services encompass everything from analyzing ideas and developing strategies to product development and launch.
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided+4 Services
20% Other IT Consulting and SI
15% API Development & Integration
15% Mobile App Development (iOS & Android)
15% Product UX Strategy
AI Summary
“OVSolutions is an IT agency providing comprehensive services from idea analysis and strategy development to product creation and launch, delivering valuable and effective product solutions.”
ReliSource
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ReliSource has been delivering high-quality specialized products and services to its clients for over 18 years. Based in Boston, MA, and with a research and development facility in Dhaka, Bangladesh, ReliSource operates as an extension of its clients' technology teams to enhance return on investment
Highlights
50-249
Employees
Bedford, Massachusetts, Us
Services Provided+13 Services
7% Custom Web Application Development
4% Frontend Development
4% Backend Development
2% Legacy System Modernization
AI Summary
“ReliSource is a Boston-based company offering specialized products and services, leveraging global expertise in sectors like pharmaceuticals and finance to enhance client ROI efficiently.”
YatiLabs Technologies LLP
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We are Yati Labs, dedicated to crafting personalized digital experiences tailored to your vision. As a genuine development partner, our goal is to design, create, and innovate for your business. We support the launch of startups, enhance enterprise software, and broaden perspectives. Our passion lie
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+3 Services
18% Custom Web Application Development
23% Mobile App Development (iOS & Android)
5% Blockchain & Web3 Development
5% Legacy System Modernization
AI Summary
“YatiLabs Technologies LLP delivers personalized digital solutions including mobile and web app development, blockchain, and UX/UI design, supporting startups and enterprises with innovative software products.”
Appsuy
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We strive every day to ensure that our clients think of us when they seek to expand their operations, modernize their systems, or require specialized services. Our emphasis is on developing web solutions, mobile applications, and technologies like AR (augmented reality), VR (virtual reality), and MR
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Montevideo, Montevideo, Uy
Services Provided+7 Services
10% Custom Web Application Development
10% Mobile App Development (iOS & Android)
3% QA & Software Testing
3% Legacy System Modernization
AI Summary
“Appsuy specializes in web and mobile applications, AR/VR/MR technologies, prioritizing ethical practices, quality services, strong client relationships, thorough documentation, and reliable support for diverse businesses.”
Viral Square
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At Viral Square, we provide comprehensive software solutions tailored to the specific needs of our clients. Established in November 2017, we have collaborated with over 100 clients across various sectors, positioning ourselves as a reliable technology partner. **Our Mission** To serve as a compre
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Lahore, Pk Punjab, Pk
Services Provided+32 Services
3% Frontend Development
2% SaaS Product Development
2% API Development & Integration
4% Custom Web Application Development
AI Summary
“Viral Square delivers tailored software solutions across industries, emphasizing innovation, compliance, and client collaboration since 2017, ensuring robust, secure, and high-quality technology partnerships.”
Vishwabharti Project Services
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Vishwabharti Project Services: Innovating Technology Solutions Vishwabharti Project Services is a leader in software innovation, providing advanced solutions aimed at empowering businesses and transforming various industries. With a strong focus on customer satisfaction, we customize our services
Highlights
< $25/hr
Avg Hourly Rate
10-49
Employees
Faridabad, Haryana, In
Services Provided+7 Services
15% Custom Web Application Development
19% Mobile App Development (iOS & Android)
10% E-Commerce Development
15% Backend Development
AI Summary
“Vishwabharti Project Services delivers customized software, web, mobile, and game development solutions along with digital transformation services to enhance business efficiency and innovation.”
Fortified Systems, Inc.
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Whether you’re beginning anew or aiming to enhance your product, our cutting-edge software and design strategies enable us to provide top-notch solutions to our clients.
Highlights
$10,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Services Provided+4 Services
14% Custom Web Application Development
10% Mobile App Development (iOS & Android)
7% E-Commerce Development
3% Legacy System Modernization
AI Summary
“Fortified Systems, Inc. delivers advanced software and design solutions, supporting clients with innovative strategies to develop or enhance products across diverse industries.”
Stallion Infosys Pvt. Ltd.
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Stallion Infosys is a reliable partner dedicated to enhancing your business through a comprehensive range of valuable IT products and services. Our goal is to achieve this through advanced, engaging, and personalized digital solutions for both web and mobile platforms. For more than eight years, we
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Services Provided+3 Services
15% Mobile App Development (iOS & Android)
15% Custom Web Application Development
8% E-Commerce Development
7% Legacy System Modernization
AI Summary
“Stallion Infosys Pvt. Ltd. delivers advanced, personalized IT solutions across web and mobile platforms, consistently exceeding client expectations globally for over eight years.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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