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

Faya Dev Ltd
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Faya Dev Ltd is a leading software engineering and IT solutions provider with a presence in both London, UK, and Iraq. We go beyond app development; we create complete digital ecosystems. Our expertise lies in developing scalable Delivery & Logistics Systems, cross-platform mobile applications, and
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+5 Services
12% ERP & CRM Development
5% E-Commerce Development
10% Mobile App Development (iOS & Android)
5% Custom Web Application Development
AI Summary
“Faya Dev Ltd offers advanced software engineering and IT solutions across London and Iraq, specializing in scalable digital ecosystems, mobile apps, and ERP integrations to optimize business operations.”
AVALPHA TECHNOLOGIES PRIVATE LIMITED
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A technology expert with extensive experience in FinTech and banking, I can work independently or as part of a top-performing team. My focus is on addressing complex challenges and creating tangible results.
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
Services Provided+1 Services
17% Custom Web Application Development
14% API Development & Integration
3% Legacy System Modernization
33% IT Staff Augmentation
AI Summary
“AVALPHA TECHNOLOGIES PRIVATE LIMITED specializes in FinTech and banking technology, delivering innovative solutions by tackling complex challenges through independent and collaborative expert efforts.”
J
John.Cloud
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Web development using cutting-edge technologies.
Highlights
$50,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
Iasi, Iasi, Ro
Services Provided+1 Services
14% E-Commerce Development
17% Custom Web Application Development
3% Legacy System Modernization
33% IT Staff Augmentation
AI Summary
“John.Cloud specializes in web development, leveraging cutting-edge technologies to deliver innovative and efficient digital solutions that meet diverse client needs across industries.”
A Bit Much Co.
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A Bit Much Co. is a global service provider that delivers a range of managed security and compliance solutions designed to ensure that its customers, both in commercial and public sectors, remain secure and adhere to relevant data privacy regulations. We conduct network penetration testing to assess
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Services Provided+8 Services
2% Frontend Development
2% Legacy System Modernization
2% Backend Development
14% Custom Web Application Development
AI Summary
“A Bit Much Co. offers global managed security, compliance, continuous penetration testing, and comprehensive IT services to safeguard networks and ensure regulatory adherence for diverse sectors.”
Autex Innovation Pvt. Ltd.
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Overview of Autex Innovation Autex Innovation is an innovative software development firm that focuses on building top-tier web and mobile applications. Established with the goal of providing advanced digital solutions, we take pride in completing projects on schedule, within budget, and to specifi
Highlights
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+4 Services
15% Mobile App Development (iOS & Android)
17% Custom Web Application Development
2% Legacy System Modernization
20% Product UX Strategy
AI Summary
“Autex Innovation Pvt. Ltd. specializes in delivering advanced web and mobile software solutions, ensuring quality, timely project completion, and extensive technological expertise across diverse platforms.”
vast-visual
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Vast Visual emerged from a variety of experiences in branding, web development, TV commercials, motion graphics, and animation. We have established ourselves in the realm of web applications and video presentations. Our passion drives us to deliver exceptional results for our clients. With our creat
Highlights
Tuart Hill, Western Australia, Au
Services Provided+6 Services
5% Mobile App Development (iOS & Android)
3% Legacy System Modernization
8% E-Commerce Development
17% Brand Film & Corporate Video
AI Summary
“Vast Visual specializes in branding, web applications, video presentations, and animation, providing creative and technical digital solutions tailored to client needs with professionalism and expertise.”
M
Mkhaya MK
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To be included.
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Sandton, Za
Services Provided+8 Services
5% Custom Web Application Development
5% API Development & Integration
5% Mobile App Development (iOS & Android)
5% ERP & CRM Development
AI Summary
“Mkhaya MK is a company offering a diverse range of services and solutions, demonstrating broad expertise and commitment to quality across multiple sectors.”
Seetru Studio Sdn Bhd
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We are a creative digital agency that emphasizes the power of simplicity in effectively conveying our clients' messages to their audiences. Our approach guarantees flawless communication of every message. Committed to excellence, we aim to meet our clients' needs, which may include UI/UX design, web
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided+14 Services
5% Product UX Strategy
4% Interaction Design
5% Web App UI Design
3% Wireframing & Prototyping
AI Summary
“Seetru Studio Sdn Bhd is a creative digital agency delivering UI/UX design, branding, video, and software solutions across various sectors with a focus on quality and client collaboration.”
DigiCareHouse
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DigiCareHouse is a New York City-based AI automation firm that serves businesses throughout the USA and globally. The company specializes in streamlining workflows, minimizing manual tasks, enhancing customer service, managing data, and creating advanced digital systems that promote faster growth. I
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+17 Services
2% Cloud Consulting & SI
6% Workflow Automation (Zapier / Make / n8n)
4% LLM Integration & Prompt Engineering
1% Machine Learning Model Development
AI Summary
“DigiCareHouse is a New York–based AI automation and technology firm offering comprehensive services in automation, software and web development, IT consulting, mobile apps, SEO, and graphic design globally.”
RightThinking
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RightThinking is the ideal partner for turning your business concepts into outstanding digital products through advanced technology and data-driven insights. We tackle complex business issues by combining strategic thinking with technological solutions. As a software development firm, we provide exc
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Tallinn, Harju, Ee
Services Provided+23 Services
3% Mobile App Development (iOS & Android)
2% Frontend Development
1% Legacy System Modernization
2% API Development & Integration
AI Summary
“RightThinking specializes in custom software and digital products, leveraging advanced technology and data-driven insights, offering comprehensive IT services globally with expert engineering teams.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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