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

Moonello
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Moonello is a systems engineering company focused on supporting expanding businesses. We enhance unstable internal processes, develop essential software products for revenue growth, and create effective growth strategies that yield real results. We implement AI in ways that provide tangible benefits
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Novi, Michigan, Us
Services Provided+4 Services
20% Custom Web Application Development
10% Mobile App Development (iOS & Android)
8% E-Commerce Development
13% Legacy System Modernization
AI Summary
“Moonello is a systems engineering firm delivering custom software development, UI/UX design, and AI-driven growth strategies to optimize processes and support sustainable business expansion.”
Autowass
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Autowass is a software development and consulting firm located in Baia Mare, Romania. 1. As we continue to evolve, we've decided to provide software development services to both existing and prospective clients across diverse industries. Our expertise in software enables us to assist clients in achi
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Baia Mare, Maramures, Ro
Services Provided
25% Custom Web Application Development
20% Mobile App Development (iOS & Android)
5% Legacy System Modernization
50% Managed IT Services
AI Summary
“Autowass is a Romanian software firm specializing in developing scalable, multi-platform solutions, notably a comprehensive B2B2C automotive platform integrating industry stakeholders and digital services.”
LGNDX | The Product Innovation Studio
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LGNDX is a product innovation studio that develops essential software for a range of clients, from the Pentagon to Silicon Valley. Our focus is on enhancing products for both public and private sectors in defense, national security, and the expanding industrial landscape. **Data Products:** We con
Highlights
$100,000+
Min Project Size
10-49
Employees
McLean, Virginia, Us
Services Provided+1 Services
40% Custom Web Application Development
10% Legacy System Modernization
25% Product UX Strategy
15% Wireframing & Prototyping
AI Summary
“LGNDX is a product innovation studio delivering customized software solutions across defense, government, and commercial sectors, enhancing data usability, product scalability, and strategic decision-making.”
Entrypoint
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Entrypoint provides innovative web applications and sophisticated native mobile apps for businesses and startups worldwide. While many typical team augmentation and outsourcing firms struggle with complex areas, integrated solutions, or UI/UX design, we excel by forming cross-functional teams that c
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Daugavpils, Daugavpils Municipality, Lv
Services Provided
30% Software Development Services
30% Mobile App Development (iOS & Android)
30% Custom Web Application Development
10% Legacy System Modernization
AI Summary
“Entrypoint delivers custom web and native mobile applications, specializing in enterprise modernization and integrated solutions through collaborative, cross-functional teams serving diverse global industries.”
SINAPTIA
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We are a Ruby on Rails development firm that collaborates with businesses of all sizes—small, medium, and large—on creating MVPs, complete applications, and enhancing teams. Our offerings include: * Comprehensive Development: We provide top-notch software that is ready to progress, whether it’s enha
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
La Plata, Buenos Aires, Ar
Services Provided+7 Services
25% Custom Web Application Development
5% E-Commerce Development
13% QA & Software Testing
8% Legacy System Modernization
AI Summary
“SINAPTIA is a Ruby on Rails-focused technology firm offering software development, AI-driven automation, and IT staff augmentation, delivering scalable solutions across various industries.”
RIGANTI software development
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We develop tailor-made software solutions and offer consulting services in software development and design. Our team creates information systems, as well as web, desktop, and mobile applications that facilitate your growth. We assist businesses with their digital transformation efforts.
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Prague, Cz
Services Provided+2 Services
20% Custom Web Application Development
13% Mobile App Development (iOS & Android)
10% API Development & Integration
7% Legacy System Modernization
AI Summary
“RIGANTI software development specializes in creating custom software solutions, including web, desktop, and mobile applications, while providing consulting services to support digital transformation and business growth.”
Pell Software
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• Entirely US-based— Our staff is full-time and never outsourced • Direct Collaboration between Clients and Engineers— No more miscommunications • Focused on Long-term Partnerships— Work directly with software engineers • Over 90 Perfect 5-Star Ratings— Exceptional service and support • Pre-
Highlights
$1,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Denver, Colorado, Us
Services Provided+2 Services
20% Custom Web Application Development
13% API Development & Integration
7% Legacy System Modernization
10% E-Commerce Development
AI Summary
“Pell Software delivers custom AI-driven business software with US-based engineers, emphasizing direct client collaboration, long-term partnerships, and cost-effective pre-built templates for optimized workflows.”
Grafixoft
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Grafixoft is a forward-thinking company certified by IT Mark, offering customized software services, business solutions, and IT consulting. Founded in Bulgaria in 1998, Grafixoft has developed enduring partnerships with firms in Norway, Belgium, the UK, and the USA by delivering dependable software
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Sofia, Sofia, Bg
Services Provided+2 Services
14% Legacy System Modernization
20% Custom Web Application Development
20% Managed IT Services
13% IT Compliance & Governance
AI Summary
“Grafixoft, founded in 1998 in Bulgaria, provides customized software services, business solutions, and IT consulting, fostering long-term client partnerships internationally with reliable, market-enhancing applications.”
Wigi Softwares
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We are a software company that employs cutting-edge tools to develop scalable, reliable, and distributed software, including web applications and enterprise solutions, guided by a strong belief in an agile approach. By integrating creativity, technology, and expertise, we assist our clients in makin
Highlights
$5,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided
25% Mobile App Development (iOS & Android)
45% Custom Web Application Development
15% E-Commerce Development
15% Legacy System Modernization
AI Summary
“Wigi Softwares develops scalable, reliable web and enterprise software using agile methodologies, combining creativity and technology to deliver impactful, distributed solutions for diverse business needs.”
JAVI solutions
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We provide digital solutions and innovations that enhance productivity and lower costs for our clients. The solutions we offer are consistently at the forefront of the industry. Our primary focus is on software development for customers in various market segments.
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Bratislava, Bratislava, Sk
Services Provided
40% Custom Web Application Development
10% Legacy System Modernization
25% Backend Development
25% Frontend Development
AI Summary
“JAVI solutions, based in Slovakia, delivers innovative custom software and enterprise app modernization services, enhancing productivity and reducing costs across diverse industries.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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