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

Celvion
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Celvion is a private engineering ecosystem focused on creating intricate web products and providing managed IT services. We go beyond mere coding; we construct infrastructure that drives revenue. Our commitment includes implementing advanced AI models from conception to production within days, ensur
Highlights
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided+2 Services
18% Custom Web Application Development
7% Legacy System Modernization
25% Cloud Consulting & SI
15% Cybersecurity Assessments & Hardening
AI Summary
“Celvion is a private engineering ecosystem delivering complex web products and managed IT services, leveraging no-code solutions, AI integration, and secure, revenue-driven infrastructures swiftly and efficiently.”
M
MosaicTech
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Mosaic-Tech provides software development services that effectively address your toughest needs. We ensure timely delivery within budget while charging a third of what our competitors do. We believe that every project is important, and we treat our clients as if they were part of our family. We woul
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided+2 Services
15% BI & Big Data Consulting & SI
10% Other IT Consulting and SI
25% Managed IT Services
18% Mobile App Development (iOS & Android)
AI Summary
“MosaicTech delivers cost-effective software development, AI, IT infrastructure, and design services with a client-focused approach, ensuring quality solutions tailored to diverse industry needs.”
Softmind Infotech Pvt. Ltd.
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We offer software outsourcing solutions from India. With a skilled team of over 100 professionals, we assist our clients in rapidly launching high-quality software. As one of India's top software development firms, we provide innovative, efficient, and cost-effective web systems and mobile applicati
Highlights
$5,000+
Min Project Size
< $25/hr
Avg Hourly Rate
50-249
Employees
Services Provided+11 Services
20% Other IT Consulting and SI
10% Legacy System Modernization
10% Managed IT Services
5% API Development & Integration
AI Summary
“Softmind Infotech Pvt. Ltd. excels in Software Development with expertise in API Development, E-Commerce Solutions, and Mobile App Development, delivering innovative and cost-effective applications to boost client business productivity.”
Zilics Ventures Private Limited
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We are a leading technology development partner committed to achieving engineering excellence. At Zilics Ventures, we assist entrepreneurs and companies in creating tailored web applications, mobile apps, and AI-based platforms that operate seamlessly even under significant demand. With extensive kn
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Bengaluru, Karnataka, In
Services Provided+3 Services
14% Custom Web Application Development
10% Mobile App Development (iOS & Android)
5% API Development & Integration
3% E-Commerce Development
AI Summary
“Zilics Ventures Private Limited is a technology partner specializing in custom web, mobile, and AI applications, delivering scalable, secure, and user-friendly digital solutions with engineering excellence.”
IT Consultis
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IT Consultis (ITC) has been awarded the Greater China Agency of the Year for 2023 with a Gold medal and a Bronze for 2024 in the categories of CRM, Clienteling, and Data. With over 14 years of experience across various sectors (B2C, B2B, B2B2C/B2B2B), we have collaborated with numerous Fortune 500 c
Highlights
50-249
Employees
Shanghai, Cn
Services Provided+12 Services
7% Mobile App Development (iOS & Android)
7% E-Commerce Development
5% Custom Web Application Development
1% Legacy System Modernization
AI Summary
“IT Consultis is a seasoned digital transformation partner offering strategy, CRM, data solutions, marketing automation, e-commerce, system integration, and talent augmentation for diverse industries.”
Kylient Software Solutions Pvt Ltd
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Kylient Software Solutions: Leading the Way in AI/ML Innovations and More Our Specialization: #ArtificialIntelligence/MachineLearning & Tailored Development Services We harness AI and ML to develop groundbreaking solutions specifically designed for your business requirements. Additionally, we ex
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
50-249
Employees
Indore, Madhya Pradesh, In
Services Provided+11 Services
4% Legacy System Modernization
5% SaaS Product Development
5% API Development & Integration
10% Custom Web Application Development
AI Summary
“Kylient Software Solutions specializes in AI/ML-driven custom software, web, and mobile development, providing comprehensive digital transformation services tailored to diverse business needs.”
OnePix
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⭐ Who We Are: A specialized development agency with a strategic approach. We create and support online platforms and digital solutions utilizing WordPress, WooCommerce, Laravel, and Shopify. Our team combines clean architectural design with business logic to develop scalable options that adapt along
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Miami, Florida, Us
Services Provided+5 Services
8% API Development & Integration
12% E-Commerce Development
8% Custom Web Application Development
3% Mobile App Development (iOS & Android)
AI Summary
“OnePix is a specialized development agency delivering scalable, tailored digital solutions across multiple industries with expertise in WordPress, WooCommerce, Laravel, Shopify, and payment integrations.”
EverTrust
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EverTrust is a technology and managed services partner designed for organizations that seek proactive IT support. We assist growing businesses in enhancing their operations, boosting security, and scaling confidently through reliable technology leadership and high-level service. Our approach is comp
Highlights
2-9
Employees
San Antonio, Texas, Us
Services Provided+4 Services
20% Cloud Consulting & SI
20% Cybersecurity Services
20% Managed IT Services
20% Other IT Consulting and SI
AI Summary
“EverTrust provides strategic, reliable IT managed services and technology leadership to enhance security, operational stability, and scalability for mission-critical business environments.”
Soluzione
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Assisting Businesses in Creating Scalable Digital Solutions Soluzione is a Microsoft Solutions Partner that specializes in Microsoft Dynamics 365, Power Platform, and custom enterprise software development. Since its inception in 2011, Soluzione has been aiding organizations in transitioning from f
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Bhopal, Madhya Pradesh, In
Services Provided+9 Services
3% QA & Software Testing
8% ERP & CRM Development
3% Mobile App Development (iOS & Android)
3% Legacy System Modernization
AI Summary
“Soluzione, a Microsoft Solutions Partner since 2011, delivers scalable digital solutions across industries through Microsoft Dynamics 365, custom enterprise applications, cloud, AI, and IT consulting globally.”
Treble Digital
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Treble Digital is a comprehensive digital agency located in Melbourne, collaborating with clients throughout Australia. Our Founder, an accomplished entrepreneur with experience in various sectors, introduces a innovative business mindset focused on achieving tangible results through a technical and
Highlights
$5,000+
Min Project Size
2-9
Employees
South Yarra, Victoria, Au
Services Provided+35 Services
5% E-Commerce Development
4% Custom Web Application Development
1% Legacy System Modernization
1% QA & Software Testing
AI Summary
“Treble Digital is a Melbourne-based full-service digital agency offering branding, product design, e-commerce, web development, marketing, and advertising services driven by technical expertise and analytical strategies.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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