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

Whale Song
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Whale Song serves as a strategic and engineering partner for organizations where reliability, compliance, and efficiency are essential. We operate at the convergence of IT and Operations Technology (OT), assisting regulated and critical sectors like Finance, Healthcare, and Heavy Industry in moderni
Highlights
$75,000+
Min Project Size
10-49
Employees
Houston, Texas, Us
Services Provided+3 Services
22% Custom Web Application Development
12% Legacy System Modernization
20% Product UX Strategy
13% UX Research & Usability Testing
AI Summary
“Whale Song partners with regulated industries to modernize workflows, automate tasks, and enhance reliability, combining strategy and engineering with a product-focused, compliant, and scalable approach.”
Solcre Software & Staff Augmentation
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We are Solcre, a nearshore technology consulting firm dedicated to helping organizations expedite their digital transformation through tailored software development and staff augmentation. We act as a genuine extension of our clients’ teams, embedding ourselves in their processes, tools, and culture
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Montevideo, Montevideo, Uy
Services Provided+6 Services
15% API Development & Integration
13% Legacy System Modernization
15% Custom Web Application Development
8% Mobile App Development (iOS & Android)
AI Summary
“Solcre Software & Staff Augmentation is a nearshore technology consulting firm offering tailored software development, staff augmentation, system integration, and digital transformation to enhance scalability and efficiency.”
TurnKey Lender
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TurnKey Lender is a leading provider of automation solutions, risk management, and loan decision-making services. Its main offering is a comprehensive platform that automates the complete lending process and features an AI-powered origination engine. Established in 2014, the startup has gained recog
Highlights
$1,000+
Min Project Size
50-249
Employees
Sg
Services Provided+4 Services
7% Cloud Consulting & SI
14% Machine Learning Model Development
3% Custom AI Chatbot Development
10% AI Strategy & Roadmap Consulting
AI Summary
“TurnKey Lender delivers AI-powered automation and risk management solutions for diverse lending sectors, enabling global lenders to streamline loan origination and decision-making processes effectively.”
Cygnet.One
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Cygnet.One is an international partner specializing in digital transformation and engineering, offering consulting in data analytics, enterprise AI solutions, and scalable cloud and engineering services for mid-sized and large organizations. Our expertise covers the entire digital lifecycle—includin
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
1000-9999
Employees
Princeton, New Jersey, Us
Services Provided+14 Services
8% Generative AI
3% IT Staff Augmentation
3% Workflow Automation (Zapier / Make / n8n)
6% Cloud Consulting & SI
AI Summary
“Cygnet.One delivers expert digital transformation services, including data analytics, enterprise AI, cloud engineering, and quality assurance, enabling scalable, AI-driven solutions for mid to large organizations globally.”
LDC SOFTWARE AND CONSULTANCY
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We create and implement customized software solutions that achieve meaningful outcomes. Our KAMELON software is a robust ERP system that provides comprehensive solutions for various sectors, including Airlines, Aviation, Retail, and Travel. Our established offerings include KAMELON Airlines, which a
Highlights
$100,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Istanbul, Tr
Services Provided
40% Custom Web Application Development
15% Mobile App Development (iOS & Android)
30% E-Commerce Development
15% Legacy System Modernization
AI Summary
“LDC SOFTWARE AND CONSULTANCY develops tailored software solutions, offering robust ERP systems like KAMELON for Airlines, Quality Management, and Ecommerce across diverse industries.”
RissaSoft
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RissaSoft is a recently founded IT service company offering a range of services including mobile app development, website design, CRM development, digital marketing, and Fintech solutions. Our team delivers a comprehensive software development lifecycle that begins with the discovery phase and concl
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Kayseri, Kayseri, Tr
Services Provided
15% E-Commerce Development
40% Mobile App Development (iOS & Android)
30% Custom Web Application Development
15% Legacy System Modernization
AI Summary
“RissaSoft is an IT services firm specializing in mobile apps, web design, CRM, digital marketing, and Fintech, providing end-to-end software development tailored to client needs.”
Phoenix Consultants Group
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Since 1995, PCG has been modernizing outdated systems and developing bespoke software solutions. They specialize in addressing issues such as error-prone Access databases, VB6 applications from absent developers, and Excel systems known only to a single user. Their projects include creating fleet fu
Highlights
2-9
Employees
Northfield, New Jersey, Us
Services Provided+4 Services
10% Custom Web Application Development
20% Legacy System Modernization
3% ERP & CRM Development
10% AI Strategy & Roadmap Consulting
AI Summary
“Phoenix Consultants Group modernizes legacy systems and crafts tailored software, specializing in compliance, operations, and AI-driven reporting to enhance critical industry workflows.”
Cyfrania
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Cyfrania is a custom software development and consulting firm located in the USA. We focus on delivering tailored technology solutions to businesses globally. Here are the key aspects that differentiate us: Vision-Driven Solutions: Your vision informs our approach. We thoroughly investigate your s
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
St. Petersburg, Florida, Us
Services Provided
40% Custom Web Application Development
35% Mobile App Development (iOS & Android)
15% E-Commerce Development
10% Legacy System Modernization
AI Summary
“Cyfrania is a USA-based software development and consulting firm delivering tailored, scalable technology solutions across diverse industries, offering end-to-end services from concept to ongoing support.”
E8 Labs
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At E8 Labs, we go beyond being just an agency. Our emphasis is on assisting founders and startups in uniquely navigating their product, market, and user interactions to achieve product-market fit more rapidly than others. In addition to creating a minimum viable product (MVP), we also take scalabili
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
San Jose, California, Us
Services Provided
35% Mobile App Development (iOS & Android)
40% Custom Web Application Development
15% E-Commerce Development
10% Legacy System Modernization
AI Summary
“E8 Labs is a comprehensive partner for startups, providing product development, design, marketing, and scalability solutions to accelerate product-market fit and growth.”
UAB ThinkBig LT
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UAB ThinkBig LT is a dynamic and socially responsible team with over five years of experience in both individual and team projects. The company's internal operations are organized in unconventional ways and operate under a flat organizational structure. Our services include providing IT solutions an
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Kaunas, Kaunas, Lt
Services Provided
40% Mobile App Development (iOS & Android)
35% Custom Web Application Development
15% E-Commerce Development
10% Legacy System Modernization
AI Summary
“UAB ThinkBig LT offers IT solutions and unique investment projects across North America and Europe, operating under a flat structure with a strong commitment to social responsibility.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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