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

MLTech Soft
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Established in 2020, MLTech Soft is a reliable provider of software development and maintenance services for international businesses. Our team of experienced engineers employs standardized project management practices to assist organizations in modernizing their systems, creating scalable products,
Highlights
$10,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Ho Chi Minh City, Vn
Services Provided+6 Services
10% Mobile App Development (iOS & Android)
13% Legacy System Modernization
10% Custom Web Application Development
7% Custom AI Chatbot Development
AI Summary
“MLTech Soft delivers reliable custom software development, system maintenance, and digital transformation services globally, combining engineering excellence with ISO-certified quality and competitive pricing.”
Smart Working
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At Smart Working, we focus on connecting businesses with premium offshore developers who seamlessly integrate into your team. Our candidates, who have experience from top US and European tech companies, provide exceptional work at a reduced cost. We promote long-term project success with a 96% reten
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
50-249
Employees
London, England, Gb
Services Provided+5 Services
17% Mobile App Development (iOS & Android)
17% Legacy System Modernization
5% Custom AI Chatbot Development
5% Machine Learning Model Development
AI Summary
“Smart Working connects businesses with top offshore developers, offering cost-effective, skilled talent integration, expert hiring support, and high retention to ensure long-term project success.”
Cloudtek
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Cloudtek is a partner in cloud transformation, focusing on designing, maintaining, and advancing cloud infrastructures. We provide cost-effective, automation-focused solutions in public, private, and hybrid settings. By utilizing serverless computing, AI-powered optimization, and edge technologies,
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
50-249
Employees
Services Provided
30% Custom Web Application Development
20% Legacy System Modernization
25% DevOps Engineering
25% Cloud Infrastructure Setup (AWS / GCP / Azure)
AI Summary
“Cloudtek specializes in cloud transformation, delivering scalable, secure, and cost-effective cloud infrastructure solutions utilizing automation, serverless computing, AI optimization, and hybrid environments to enhance business agility.”
Key Management Group
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Key Management Group Inc. (certified ISO 27001:2013) is a software development and IT services company located in New York, specializing in business process support solutions. We offer top-tier services in consulting, technology, operations, and digital transformation, focusing on achieving business
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
50-249
Employees
Jericho, New York, Us
Services Provided+8 Services
18% Legacy System Modernization
8% QA & Software Testing
2% AI Agent & Multi-Agent System Development
4% Robotic Process Automation (RPA)
AI Summary
“Key Management Group Inc. is a New York-based ISO-certified IT services company delivering innovative software solutions, consulting, and digital transformation to drive business growth and excellence.”
Axiallon Software
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Axiallon Software is a tailored digital consulting and software development firm that offers top-notch engineering solutions for Fortune 500 companies, government entities, funded startups, and enterprise clients.
Highlights
$10,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Plano, Texas, Us
Services Provided
50% Custom Web Application Development
35% Mobile App Development (iOS & Android)
15% Legacy System Modernization
AI Summary
“Axiallon Software delivers customized digital consulting and software development services, providing high-quality engineering solutions to Fortune 500 firms, government agencies, startups, and enterprises.”
Raaya – Mobile App Development Company in Pune
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**Company Name:** Raaya – Mobile App Development Firm in Pune **Owner:** Radhika Jaju **Address:** AM.PM CO-WORK, City Pride, B/8, Market Yard Road, 8 Adarsha Nagar, Satara Rd, near Adhinath Society, Pune, Maharashtra 411037 **Phone:** 7822053452 **Website:** Raya Consultancy & Services – Ex
Highlights
2-9
Employees
Pune, Maharashtra, In
Services Provided
75% Mobile App Development (iOS & Android)
15% API Development & Integration
10% Legacy System Modernization
AI Summary
“Raaya, a Pune-based mobile app development firm founded in 2024, offers comprehensive iOS, Android, cross-platform, IoT app solutions including UI/UX design, development, optimization, and support services.”
RanaWeb
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We are RanaWeb.in, a reputable digital agency with over 10 years of experience in providing top-notch web solutions. Rather than assembling a team of various freelancers, you can rely on our dedicated team, which can manage your entire project—from start to finish—efficiently and at competitive rate
Highlights
< $25/hr
Avg Hourly Rate
10-49
Employees
Bhavnagar, Gujarat, In
Services Provided
75% Custom Web Application Development
10% Legacy System Modernization
15% QA & Software Testing
AI Summary
“RanaWeb.in is a digital agency with over 10 years' experience delivering custom TYPO3, WordPress, and Magento 2 web solutions, offering end-to-end project management with quality, flexibility, and client focus.”
Lunova
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Lunova is a group of specialists prepared to meet your requirements. Regardless of the scale or intricacy of your IT project, we are equipped to manage it comprehensively—from initial concept and design to implementation and continuous support. Our in-depth experience and adaptable methodology enabl
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Krakow, Lesser Poland, Pl
Services Provided
50% Custom Web Application Development
35% API Development & Integration
15% Legacy System Modernization
AI Summary
“Lunova offers comprehensive IT services from concept to support, utilizing expert knowledge and flexible methods to deliver tailored digital transformation solutions that advance business objectives.”
Esquiretec
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We offer IT Solutions and Support, providing comprehensive IT services, expert technical assistance, and reliable AMC solutions to ensure the optimal performance of your systems. Website Development We create custom, responsive websites that align with your brand and enhance user engagement. Soc
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
20% Legacy System Modernization
14% API Development & Integration
33% IT Staff Augmentation
33% Operational Process Consulting
AI Summary
“Esquiretec delivers comprehensive IT solutions including website development, digital marketing, ERP integration, and support services to optimize business performance and enhance online presence.”
Sophyx AI
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SophyxAI is a premier technical consultancy and product engineering company made up of former Principal Architects and Product Leads from Google and Meta. We focus on designing and implementing production-quality Agentic AI systems and scalable cloud infrastructure to automate essential workflows, g
Highlights
$100,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided+3 Services
13% AI Strategy & Roadmap Consulting
10% LLM Integration & Prompt Engineering
7% Custom AI Chatbot Development
10% Machine Learning Model Development
AI Summary
“SophyxAI is a technical consultancy specializing in designing and implementing scalable Agentic AI systems, cloud infrastructure, and legacy modernization to help enterprises deploy secure, data-driven workflows.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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