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

Appbay Technologies Private Limited
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Appbay Technologies is a worldwide digital transformation firm focused on low-code development, enterprise automation, and AI-driven innovation. As an authorized partner of Appian and with proficiency in Salesforce, PowerApps, ServiceNow, Databricks, and AI, we assist organizations in modernizing th
Highlights
$5,000+
Min Project Size
50-249
Employees
Jaipur, Rajasthan, In
Services Provided+4 Services
13% Legacy System Modernization
18% ERP & CRM Development
7% QA & Software Testing
12% Custom Web Application Development
AI Summary
“Appbay Technologies delivers global digital transformation through low-code development, AI, and enterprise automation, serving sectors like Banking and Healthcare with scalable, data-driven solutions and expert partnerships.”
Vietlink
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We are among the leading software development firms in Vietnam, renowned for our high-quality standards that satisfy the stringent requirements of premier communication companies in Japan.
Highlights
$5,000+
Min Project Size
10-49
Employees
Ho Chi Minh City, Vn
Services Provided
25% Mobile App Development (iOS & Android)
40% Custom Web Application Development
25% QA & Software Testing
10% Legacy System Modernization
AI Summary
“Vietlink is a leading Vietnamese software development firm known for delivering high-quality solutions that meet the rigorous standards of top Japanese communication companies.”
Appbiquity
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Appbiquity is a fast-growing IT consulting company dedicated to providing high-quality services and products in the mobile industry. We assist clients in recognizing opportunities and risks that address both short-term challenges and long-term value creation. By choosing us, you'll gain access to an
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
250-999
Employees
Services Provided
10% Blockchain & Web3 Development
60% Mobile App Development (iOS & Android)
25% Custom Web Application Development
5% Legacy System Modernization
AI Summary
“Appbiquity is a global IT consulting firm offering comprehensive mobile, web, game, and enterprise app development services along with Salesforce solutions and marketing expertise.”
Iterative Engineering
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Iterative Engineering offers software solutions and cutting-edge IT engineering services. Our clientele and projects focus on digital transformation, utilizing a primary technology stack. If you seek skilled professionals for your project and prioritize quality, we are here to assist you. Reach out
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Zabrze, Pl
Services Provided+2 Services
23% Custom Web Application Development
10% Legacy System Modernization
33% IT Staff Augmentation
12% Business Plan Development
AI Summary
“Iterative Engineering delivers advanced software solutions and IT engineering services specializing in digital transformation with a skilled team committed to quality and client-focused project execution.”
pep.digital GmbH
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pep.digital is your strategic ally for bespoke digitalization initiatives that enhance efficiency and innovation in medium and large organizations. We recognize that standard software often fails to meet complex needs. Thus, we create customized web and mobile applications, robust backend systems, a
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Esslingen am Neckar, Baden Wurttemberg, De
Services Provided
40% Custom Web Application Development
25% Mobile App Development (iOS & Android)
25% API Development & Integration
10% Legacy System Modernization
AI Summary
“pep.digital GmbH specializes in custom digital solutions—web, mobile, backend, AI, and integrations—to modernize processes, enhance products, and deliver measurable business value for medium and large enterprises.”
Salamander Prime Solutions.
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You're likely not looking for "just another agency." We don't offer junior support while senior staff handle decision-making; the same individual remains responsible for both strategy and execution. Many teams turn to us when their delivery is becoming costly or when failure is not an option. This i
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+2 Services
12% Legacy System Modernization
10% API Development & Integration
5% E-Commerce Development
7% Custom Web Application Development
AI Summary
“Salamander Prime Solutions is a senior European engineering team specializing in high-stakes software delivery, offering accountable, transparent, and proactive leadership for critical, complex projects.”
Tandemloop Technologies Private Limited
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Tandemloop is dedicated to addressing the vital challenges encountered by our clients, regardless of their size. Our distinctive method sets us apart and contributes to our success. We offer an extensive array of services and solutions aimed at assisting organizations in driving change, realizing th
Highlights
$5,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Bengaluru, Karnataka, In
Services Provided+2 Services
30% Mobile App Development (iOS & Android)
25% Custom Web Application Development
15% Software Development Services
10% Legacy System Modernization
AI Summary
“Tandemloop Technologies specializes in delivering comprehensive web application solutions, combining innovative design and robust implementation to enhance organizational performance and productivity across diverse client needs.”
Sensiple
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Sensiple is a brand owned by E Pro Inc., a corporation based in New Jersey that was founded in 1999. Our global presence enables us to uphold our delivery standards consistently. We offer IT products and services across various sectors including Customer Experience, Capital Markets, Digital & Enterp
Highlights
$10,000+
Min Project Size
< $25/hr
Avg Hourly Rate
250-999
Employees
Chennai, Tamil Nadu, In
Services Provided+4 Services
13% Legacy System Modernization
20% Custom Web Application Development
17% Managed IT Services
10% IT Helpdesk & Support Services
AI Summary
“Sensiple, a New Jersey-based IT firm, delivers scalable digital transformation, consulting, and staffing services across industries, integrating technology, processes, and people to drive competitive advantage.”
FINEST AS
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FINEST AS is a software development and IT consulting firm based in Estonia, boasting over 20 years of experience in providing tailored digital solutions for enterprise, government, and commercial sectors across Estonia, Poland, and Europe. Our operations are divided into three specialized divisions
Highlights
$50,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Tallinn, Harju, Ee
Services Provided+1 Services
14% Custom Web Application Development
10% Legacy System Modernization
10% E-Commerce Development
33% IT Staff Augmentation
AI Summary
“FINEST AS is an Estonian IT firm delivering tailored software, e-commerce platforms, and consulting services across public and commercial sectors in Europe with over 20 years' expertise.”
Coherent Solutions
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Coherent Solutions is a premier global digital engineering firm operating in 10 countries, supported by a workforce of more than 2,000 adept engineers. We leverage cutting-edge technologies, exceptional talent, and efficient processes to assist our clients in reaching their business objectives and m
Highlights
$50,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
1000-9999
Employees
Minneapolis, Minnesota, Us
Services Provided+13 Services
12% API Development & Integration
8% Legacy System Modernization
14% Custom Web Application Development
3% Conversational AI & Voice Assistant Development
AI Summary
“Coherent Solutions is a global digital engineering firm with 2,000+ engineers across 10 countries, delivering advanced technology solutions to help clients achieve business success and competitive advantage.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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