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

Evolved Ideas
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Collaborating closely with your team, we develop technological solutions that propel your business ahead. With a team of over 100 designers, developers, and analysts, we not only create exceptional software but also foster thriving businesses and successful products. We assist companies of all sizes
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Ratby, England, Gb
Services Provided+1 Services
25% Custom Web Application Development
15% Mobile App Development (iOS & Android)
10% Legacy System Modernization
40% IT Staff Augmentation
AI Summary
“Evolved Ideas partners with businesses to deliver flexible, on-demand technology services, including software development, team augmentation, and support, driving innovation and growth across diverse industries.”
Paynalli Systems
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Minimizing risk, enhancing cybersecurity frameworks, and reducing IT expenses through our Digital Identity-focused strategy. We assist clients in strengthening their cybersecurity posture by leveraging our extensive expertise in Identity and Access Management and the Zero Trust Security model. We ex
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Merida, Yucatan, Mx
Services Provided+4 Services
7% AI Strategy & Roadmap Consulting
7% Machine Learning Model Development
3% IT Staff Augmentation
3% Generative AI
AI Summary
“Paynalli Systems delivers AI-driven automation, custom software development, and robust IT infrastructure services, specializing in cybersecurity, digital transformation, and cloud-native solutions to enhance client operations.”
Inwedo
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Inwedo partners with mid-sized and large organizations to enhance their business processes. We leverage customized software and practical AI to assist teams in automating repetitive tasks, updating outdated systems, and creating tools that streamline daily operations, making them more efficient and
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Lodz, Lodz, Pl
Services Provided+9 Services
8% Backend Development
14% Legacy System Modernization
8% Custom Web Application Development
3% Frontend Development
AI Summary
“Inwedo specializes in customized software, AI integration, and legacy modernization to optimize business processes across diverse industries, ensuring secure, efficient, and scalable technology solutions.”
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MyGeo LLC
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MyGeo LLC provides software solutions focused on IT internal automation, integration, and comprehensive software development throughout its lifecycle. They offer consulting services, project management, and work on prototypes as well as medium to large-scale software projects using Python, JavaScrip
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Miami, Florida, Us
Services Provided
18% Legacy System Modernization
32% API Development & Integration
50% Digital Strategy
AI Summary
“MyGeo LLC delivers IT automation, software development, AI/ML integration, and DevOps services, leveraging technologies like Python and AWS for enterprises including JP Morgan and Amazon.”
Xside
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We are a company founded by experienced developers who specialize in creating cutting-edge software while eliminating the usual overhead associated with conventional IT services.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Buenos Aires, Ar
Services Provided
30% Mobile App Development (iOS & Android)
40% Custom Web Application Development
10% Legacy System Modernization
20% API Development & Integration
AI Summary
“Xside is a developer-founded company specializing in innovative software development, delivering advanced solutions efficiently while minimizing traditional IT service overhead.”
Smartech EAM Experts
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Founded in 2009, Smartech focuses on asset management and maintenance, with a strong emphasis on Enterprise Asset Management (EAM) services using IBM Maximo—the leading platform in the EAM sector—and CARL Software. Throughout the years, the company has grown its team and expertise, opening offices i
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided
18% Legacy System Modernization
12% Mobile App Development (iOS & Android)
20% Custom Web Application Development
50% Other IT Consulting and SI
AI Summary
“Smartech EAM Experts specializes in Enterprise Asset Management solutions using IBM Maximo and CARL Software, offering innovative tools and tailored services across diverse industries worldwide.”
K1 CORE
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K1 CORE is a developer of blockchain financial software that offers comprehensive IT services to B2B clients and markets white-label cryptocurrency exchanges, payment solutions, wallets, and more—all of which receive ongoing support from K1 CORE. The company is part of Kauri One Inc., a group founde
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Cy
Services Provided
75% Blockchain & Web3 Development
10% Software Development Services
10% Legacy System Modernization
5% Custom Web Application Development
AI Summary
“K1 CORE specializes in blockchain financial software, offering scalable custom SaaS applications, white-label crypto exchanges, payment solutions, and cloud-based AI integration for secure enterprise automation.”
3 Labs Development
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3 Labs Development is a software development agency based in Fort Collins, focused on creating tailored web and mobile applications. The company was established in response to the prevalence of companies being exploited by developers who implement unnecessary features or use inappropriate technologi
Highlights
$10,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Services Provided
40% Software Development Services
20% Legacy System Modernization
20% Mobile App Development (iOS & Android)
20% Custom Web Application Development
AI Summary
“3 Labs Development is a Fort Collins-based software agency delivering tailored web and mobile applications with a business-oriented approach and traditional project management for quality outcomes.”
Mugna Passion Project
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We assist change-makers in speeding up their mission via digital transformation.
Highlights
$1,000+
Min Project Size
10-49
Employees
Lapu-Lapu City, Central Visayas, Ph
Services Provided+1 Services
20% Legacy System Modernization
14% Blockchain & Web3 Development
23% Digital Strategy
10% Social Media Marketing
AI Summary
“Mugna Passion Project accelerates change-makers' missions through digital transformation, offering comprehensive support to drive impactful social and organizational advancements efficiently.”
Sytecs, LLC
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We create intricate software and hardware solutions designed to automate our clients' core business processes and remove the influence of human error in task execution. Additionally, our solutions streamline the execution of production tasks for employees. By integrating enterprise management IT inf
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Kyiv, Ua
Services Provided+1 Services
25% Custom Web Application Development
10% Mobile App Development (iOS & Android)
15% Legacy System Modernization
35% Cloud Consulting & SI
AI Summary
“Sytecs, LLC develops integrated software and hardware solutions that automate business processes, minimize human error, and optimize management of technical and human resources in production environments.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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