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

Sly AG
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We are Sly, specialists in engineering Swiss B2B eCommerce solutions for over 20 years. Our fundamental principles include Swiss quality, honest consultations, and complete transparency. We aim to simplify the complexities of today's B2B eCommerce landscape while ensuring these systems are future-pr
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Zurich, Zurich, Ch
Services Provided
70% E-Commerce Development
25% Custom Web Application Development
5% Legacy System Modernization
AI Summary
“Sly AG, with over 20 years' experience, specializes in Swiss B2B eCommerce by delivering headless, microservice-based solutions and consulting for innovative, future-proof digital commerce.”
Novatura
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We offer software development services to businesses seeking to innovate or expand in the technology sector. With a focus on contemporary web and cloud technologies, we create cost-effective and future-ready solutions.
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Lytchett Matravers, Gb
Services Provided+1 Services
15% API Development & Integration
15% Mobile App Development (iOS & Android)
40% Custom Web Application Development
15% QA & Software Testing
AI Summary
“Novatura delivers innovative software development services utilizing modern web and cloud technologies, enabling businesses to achieve cost-effective, scalable, and future-proof technology solutions.”
Done HQ
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We are a team of web experts dedicated to assisting marketers from rapidly growing companies that face numerous unresolved marketing challenges. These companies often lack in-house staff to address these issues, and recruiting new employees and establishing marketing processes can be resource-intens
Highlights
$25,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Buffalo Grove, Illinois, Us
Services Provided+2 Services
35% Custom Web Application Development
8% Legacy System Modernization
8% CMS Development & Customization
20% Product UX Strategy
AI Summary
“Done HQ is a professional organization offering comprehensive solutions across multiple sectors, emphasizing quality and efficiency to meet diverse client needs with expertise and innovation.”
Glatzon Solution
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Our company is located in southern Brazil and specializes in offering IT expertise and software development services to businesses. We maintain a round-the-clock monitoring team ready to assist with international projects. Additionally, we have a dedicated troubleshooting team to ensure the best sol
Highlights
$5,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Gaspar, Santa Catarina, Br
Services Provided+3 Services
25% Other IT Consulting and SI
15% Legacy System Modernization
15% HR Consulting Services
15% Recruitment & Staffing Services
AI Summary
“Glatzon Solution, based in southern Brazil, offers comprehensive IT expertise and software development services with 24/7 monitoring and dedicated troubleshooting for international businesses.”
Resolute Software
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Resolute Software is an IT services firm that provides extensive software engineering development and consulting. The company emphasizes agile, continuous, and reliable delivery of solutions to help enhance your digital presence. Resolute Software supports businesses in modernizing, innovating, tran
Highlights
$25,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
50-249
Employees
Sofia, Sofia, Bg
Services Provided+4 Services
5% Mobile App Development (iOS & Android)
13% Custom Web Application Development
8% Legacy System Modernization
10% Other IT Consulting and SI
AI Summary
“Resolute Software delivers agile IT services and software development, enabling digital transformation and innovation through expert consulting and tailored solutions for business success.”
CreateOS
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CreateOS develops tailored AI solutions for product teams and large organizations. We manage the integration of large language models (LLMs), retrieval-augmented generation (RAG) pipelines, AI agents, and comprehensive automation from start to finish. Our services are supported by robust infrastruct
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+1 Services
18% Generative AI
22% AI Agent & Multi-Agent System Development
10% AI Strategy & Roadmap Consulting
35% Custom Web Application Development
AI Summary
“CreateOS delivers end-to-end AI solutions integrating large language models and automation for organizations, offering extensive infrastructure, fixed pricing, and full intellectual property ownership.”
PeoplenTech Software
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PeopleNTech is a global technology company that takes pride in delivering services in distinctive ways. Our motto focuses on offering top-notch services and ensuring complete customer satisfaction worldwide. Established in 2004 and based in the US, PeopleNTech specializes in IT consulting, training,
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Dhaka, Dhaka, Bd
Services Provided+9 Services
10% Software Development Services
10% E-Commerce Development
10% Legacy System Modernization
10% Mobile App Development (iOS & Android)
AI Summary
“PeopleNTech is a global IT services company providing consulting, training, recruitment, outsourcing, and custom software development since 2004, with a strong focus on customer satisfaction and expertise.”
NodeArt Soft Ukraine LLC
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NodeArt Soft Ukraine LLC is a leading IT outsourcing company in Ukraine, located in the capital city of Kyiv and established in 2016. We create various types of applications, including web, mobile, and desktop solutions. By utilizing the complete range of Atlassian products, we ensure seamless and e
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Kyiv, Ua
Services Provided
40% Custom Web Application Development
40% Mobile App Development (iOS & Android)
10% E-Commerce Development
10% Legacy System Modernization
AI Summary
“NodeArt Soft Ukraine LLC, established in Kyiv in 2016, is a leading IT outsourcing company specializing in web, mobile, and desktop application development with efficient client communication.”
CodeCoda Ltd.
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CodeCoda is an innovative provider of global IT and BPO services, solutions, and advanced software development, positioned within one of the fastest-growing industries globally. Founded by IT veterans, the company aims to create a stable work environment while maintaining a commitment to true custom
Highlights
$25,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Plovdiv, Plovdiv, Bg
Services Provided+1 Services
13% Mobile App Development (iOS & Android)
7% E-Commerce Development
25% Custom Web Application Development
5% Legacy System Modernization
AI Summary
“CodeCoda Ltd. delivers global IT and BPO solutions, specializing in advanced software development and AI, serving diverse industries with reliable outsourcing and long-term client partnerships.”
KorrAI
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TRAIL is KorrAI's AI-driven platform designed for desktop risk assessments, investment choices, hazard detection, and ongoing monitoring throughout the entire project lifecycle. It consolidates geospatial data, geotechnical analyses, satellite InSAR data, catastrophe model results, and engineering d
Highlights
10-49
Employees
Halifax, Nova Scotia, Ca
Services Provided
15% AI Agent & Multi-Agent System Development
35% Custom AI Chatbot Development
40% API Development & Integration
10% Legacy System Modernization
AI Summary
“KorrAI's TRAIL platform integrates geospatial and engineering data with AI to support critical infrastructure risk assessments, investment decisions, and monitoring for diverse industries globally.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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