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

Proximity Group
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Founded in 2007, our team of over 40 experts located in Leeds and Nottingham offers software solutions, development, support, and maintenance services to businesses throughout the UK and Europe. In collaboration with some of the leading software firms globally, Proximity creates, implements, maintai
Highlights
$50,000+
Min Project Size
10-49
Employees
Horsforth, West Yorkshire, Gb
Services Provided
13% Custom Web Application Development
30% ERP & CRM Development
7% Legacy System Modernization
50% ERP Consulting and SI
AI Summary
“Proximity Group delivers expert software development and ERP consulting, specializing in custom solutions, enterprise modernization, and AI-driven automation for logistics, manufacturing, and retail sectors in the UK and Europe.”
Mundrisoft Solutions
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Mundrisoft is a comprehensive IT partner that offers complete solutions for rapidly expanding mid-sized and large companies, including Microsoft. Our mission at Mundrisoft is to harness the potential of emerging technologies for businesses of all sizes. We create and implement cutting-edge technolog
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Pune, Maharashtra, In
Services Provided+6 Services
8% Custom Web Application Development
8% Legacy System Modernization
5% Backend Development
4% Frontend Development
AI Summary
“Mundrisoft offers scalable, agile IT solutions including application modernization, custom development, and testing services, supporting digital transformation and staff augmentation for mid-sized to large enterprises.”
Merixstudio
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Merixstudio: Leading Global Software Development Partner Merixstudio is ranked #5 on the Clutch 1000 list of top B2B service providers and holds the top position among software development firms globally. We specialize in merging consulting, design, and software engineering to create digital solut
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Poznan, Greater Poland, Pl
Services Provided+5 Services
20% Custom Web Application Development
15% Mobile App Development (iOS & Android)
15% API Development & Integration
10% E-Commerce Development
AI Summary
“Merixstudio is a leading global software development partner specializing in consulting, design, and engineering to deliver secure, scalable digital solutions that enhance growth, reliability, and customer experience.”
VOLO
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Established in 2006, VOLO is a worldwide software engineering and tech consulting company. We work with a range of clients, from emerging startups to Fortune 500 firms, to provide innovative solutions and technological expertise across various sectors. Our focus is on developing AI solutions and int
Highlights
$50,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
250-999
Employees
Yerevan, Am
Services Provided+4 Services
20% Custom Web Application Development
15% Mobile App Development (iOS & Android)
8% Legacy System Modernization
8% ERP & CRM Development
AI Summary
“Founded in 2006, VOLO is a global software engineering and tech consulting firm specializing in AI-driven solutions that automate tasks and support diverse industries with long-term partnerships.”
BuildEmpire
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We are specialists in software development, focusing on customized, scalable solutions, with an emphasis on reliable delivery. Our commitment to producing high-quality code and collaborating closely with clients distinguishes us from others. Over the years, we have silently supported several well-kn
Highlights
$50,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Manchester, England, Gb
Services Provided+1 Services
30% Custom Web Application Development
10% Legacy System Modernization
10% Frontend Development
30% UX Research & Usability Testing
AI Summary
“BuildEmpire is a UK-based firm specializing in custom, scalable web applications with strong UX/UI design focus, serving diverse sectors through reliable, high-quality, and client-centered software solutions.”
B2GSOFT
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We will work together to help you define your goal, select the right tools, and cultivate your business to make it stand out.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Dhaka, Dhaka, Bd
Services Provided+7 Services
15% E-Commerce Development
15% Legacy System Modernization
12% Social Media Marketing
10% Software Development Services
AI Summary
“B2GSOFT collaborates closely with clients to establish clear goals, choose appropriate tools, and develop their business to achieve distinct market presence and growth.”
DevIQ
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DevIQ is a specialized consultancy focusing on software and data engineering, dedicated to creating, developing, and implementing cutting-edge AI-driven solutions. We help our clients enhance their initiatives, enabling them to grow, innovate, and remain competitive. Our enduring reputation for exce
Highlights
$50,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Denver, Colorado, Us
Services Provided+3 Services
10% AI Agent & Multi-Agent System Development
8% AI Strategy & Roadmap Consulting
15% Machine Learning Model Development
20% Digital Strategy
AI Summary
“DevIQ is a specialized consultancy delivering AI-driven software modernization, digital strategy, and enterprise solutions that foster innovation, growth, and competitive advantage across industries.”
AMP Tech
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AMP Tech is a strategic engineering consultancy located in Argentina, specializing in centralizing and enhancing the technological infrastructures of businesses that need to maintain continuous operations. We go beyond mere software development; we serve as your comprehensive technology partner. Our
Highlights
2-9
Employees
Caseros, Buenos Aires, Ar
Services Provided+4 Services
25% Other IT Consulting and SI
25% Operational Process Consulting
11% Cybersecurity Assessments & Hardening
8% Disaster Recovery & Business Continuity Planning
AI Summary
“AMP Tech is an Argentine engineering consultancy delivering scalable high-performance software, enterprise-grade infrastructure, and cybersecurity solutions, transforming technology into a global competitive advantage.”
Graaho Technologies
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AWS Advanced Tier Partner | Cloud Architecture, DevOps, AI Chatbots & Cost Optimization We offer comprehensive AWS and AI-driven solutions to assist you in designing, building, optimizing, and scaling your cloud infrastructure effectively. As an AWS Advanced Tier Partner, we adhere to industry best
Highlights
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+7 Services
17% Custom AI Chatbot Development
7% AI Strategy & Roadmap Consulting
3% Workflow Automation (Zapier / Make / n8n)
5% Cloud Consulting & SI
AI Summary
“Graaho Technologies is an AWS Advanced Tier Partner specializing in secure, scalable cloud architecture, DevOps, cost optimization, and AI-powered chatbot solutions to optimize business automation and performance.”
DataChip Inc
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We are a company that provides technology solutions and services, specializing in Application Development, Data Analytics/Business Intelligence, IoT, Legacy Upgrade Services, and engineering services. By utilizing our technical expertise, extensive industry knowledge, and reliable delivery methods,
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
250-999
Employees
North Brunswick, New Jersey, Us
Services Provided+3 Services
15% Custom Web Application Development
10% Mobile App Development (iOS & Android)
8% Legacy System Modernization
33% Other IT Consulting and SI
AI Summary
“DataChip Inc. delivers global technology solutions in application development, data analytics, IoT, and engineering services, driving measurable client outcomes with expert teams and reliable delivery.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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