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

Codex Software
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With years of industry experience, we have refined our skills in creating robust, scalable, and secure software solutions tailored for startups, small to medium-sized businesses, and large enterprises. We focus on a diverse range of sectors, including eCommerce, finance, insurance, healthcare, proje
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Lisboa, Lisbon, Pt
Services Provided
10% Legacy System Modernization
23% E-Commerce Development
17% Custom Web Application Development
50% IT Staff Augmentation
AI Summary
“Codex Software delivers robust, scalable, and secure software solutions across diverse industries, partnering with startups and multinational enterprises to achieve high-quality, timely, and budget-friendly digital objectives.”
CODE AT IT
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CODE AT IT (Codeatit) is a Romanian software engineering firm that specializes in creating secure, high-availability systems for FinTech and regulated industries. We develop robust Java/Spring Boot microservices, upgrade legacy systems, and deploy IAM/SSO solutions (OIDC/OAuth2/JWT/SAML) while adher
Highlights
$50,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+1 Services
18% API Development & Integration
10% Custom Web Application Development
2% E-Commerce Development
20% Legacy System Modernization
AI Summary
“CODE AT IT is a Romanian software engineering firm delivering secure, reliable software solutions—from architecture to cloud deployment—for FinTech and regulated industries, specializing in Java microservices and identity management.”
NGTI
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NGTI is a premier agency specializing in mobile app development. We create and deliver top-notch technological mobile applications for native, hybrid, and web platforms. Our clients rely on us to develop intelligent solutions that enhance value for their businesses, improve customer experiences, and
Highlights
$10,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
50-249
Employees
Rotterdam, South Holland, Nl
Services Provided
70% Mobile App Development (iOS & Android)
20% Custom Web Application Development
10% Legacy System Modernization
AI Summary
“NGTI specializes in delivering advanced mobile app solutions across native, hybrid, and web platforms, enhancing business value, customer experience, and profitability through innovative technology.”
E Edge Technology PVT. LTD.
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E Edge Technology is a comprehensive custom software development firm established in 2014 and located in Ahmedabad, India. With over 16 years of experience in the industry, we have successfully completed more than 400 projects and served over 299 satisfied clients worldwide. Our focus is on creating
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Ahmedabad, Gujarat, In
Services Provided
45% Custom Web Application Development
30% E-Commerce Development
15% API Development & Integration
10% Legacy System Modernization
AI Summary
“E Edge Technology, based in Ahmedabad, India, specializes in custom software, mobile, eCommerce, and CMS development across 30+ industries, delivering scalable and secure digital solutions worldwide.”
Steer73
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Experience the reliability of delivery commonly found with the top global agencies, all without the expensive fees associated with New York developers. Whether serving large enterprises like DHL, Flutter, and Chubb, or smaller businesses like Camile, Boojum, and everymum.ie, we execute projects that
Highlights
$10,000+
Min Project Size
10-49
Employees
Services Provided+2 Services
25% Mobile App Development (iOS & Android)
20% Software Development Services
20% Legacy System Modernization
15% Custom Web Application Development
AI Summary
“Steer73 delivers reliable, cost-effective technology solutions from concept to full development for diverse clients, offering expert guidance and complimentary Discovery services to optimize ROI.”
Inflection Spark Solutions
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Inflection Spark Solutions assists mid-sized companies and startups poised for AI integration in their journey to modernize, expand, and excel through smart transformation. We offer part-time CTO and CPO services, helping organizations navigate AI-driven innovations, infrastructure upgrades, and pro
Highlights
$5,000+
Min Project Size
$150+/hr
Avg Hourly Rate
2-9
Employees
Services Provided
40% Other IT Consulting and SI
20% DevOps Engineering
20% Legacy System Modernization
20% IT Staff Augmentation
AI Summary
“Inflection Spark Solutions supports mid-sized firms and startups with part-time CTO/CPO services, driving AI integration, cloud modernization, product innovation, and organizational agility across various industries.”
4IRE
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4IRE is a premier blockchain development firm known for delivering essential solutions with reliable execution and top-tier security, trusted by enterprises. As part of the 4IRE Group since 2023, we offer extensive blockchain and FinTech infrastructure services to financial institutions and innovati
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
250-999
Employees
Services Provided
75% Blockchain & Web3 Development
20% Software Development Services
5% Legacy System Modernization
AI Summary
“4IRE is a leading blockchain development firm offering multi-chain solutions, comprehensive FinTech infrastructure, and trusted partnerships to enterprises for secure, compliant blockchain adoption.”
Pensaers
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Pensaers is a software engineering company led by experienced professionals, catering to clients with challenges that are too intricate, specialized, or critical for conventional development agencies. We handle projects that other firms avoid, delivering them within the agreed timeframe. Our experti
Highlights
$50,000+
Min Project Size
$150+/hr
Avg Hourly Rate
2-9
Employees
Services Provided+1 Services
30% API Development & Integration
20% Legacy System Modernization
18% AI Strategy & Roadmap Consulting
25% Machine Learning Model Development
AI Summary
“Pensaers specializes in complex, critical software engineering across diverse sectors like healthcare and AI, offering a small expert team with full project ownership and timely delivery.”
Intelygenz
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We are a group of developers, dedicated learners, and ambitious innovators focused on improving businesses by implementing AI-driven automation solutions. Founded in 2002, Intelygenz has consistently prioritized high-quality software development. With more than 20 years of experience in creating, de
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Madrid, Madrid, Es
Services Provided+2 Services
20% Legacy System Modernization
30% Custom Web Application Development
20% Machine Learning Model Development
10% Cloud Consulting & SI
AI Summary
“Intelygenz, founded in 2002, offers AI-driven automation and software development, partnering globally to enhance business efficiency and support innovation for multinational R&D teams.”
Allmatics
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Allmatics is a reliable ally in software development, aiding your business expansion by automating essential processes and crafting cutting-edge client-focused products. Our firm specializes in IT software development, assisting clients in building outstanding IT products from the ground up. We poss
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided
35% Custom Web Application Development
25% Mobile App Development (iOS & Android)
20% E-Commerce Development
20% Legacy System Modernization
AI Summary
“Allmatics specializes in software development, delivering tailored IT products, automation, and management solutions across various industries including Retail, HealthTech, E-Commerce, and corporate systems.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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