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

Appmint
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Appmint consists of a group of professionals who naturally came together due to our shared commitment to achieving the best outcomes. With over eight years of experience working alongside top European companies, we are eager to bring our expertise to the market. Our continuous focus on enhancing the
Highlights
$25,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Tallinn, Harju, Ee
Services Provided
85% Mobile App Development (iOS & Android)
15% Legacy System Modernization
AI Summary
“Appmint delivers agile, reliable software and mobile app development services with expertise in application modernization and low/no-code solutions, serving European enterprises with over eight years of experience.”
arikx
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ARIKX is a software engineering firm designed for founders and operators who view software as a capital investment rather than a cost to reduce. We collaborate with non-tech businesses in sectors like health and wellness, retail, logistics, finance, and professional services to improve manual proces
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided
40% Custom Web Application Development
25% Mobile App Development (iOS & Android)
10% E-Commerce Development
25% Legacy System Modernization
AI Summary
“ARIKX is a software engineering firm partnering with non-tech businesses to deliver custom, reliable applications and cloud solutions focused on long-term value and timely delivery.”
Essential Designs
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At Essential Designs, we focus on enterprise software development, tailored software solutions, mobile app creation, legacy system upgrades, and long-term software maintenance for organizations requiring scalable technology that aligns with actual business processes. With over 18 years of experience
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Vancouver, British Columbia, Ca
Services Provided
50% Custom Web Application Development
35% Mobile App Development (iOS & Android)
15% Legacy System Modernization
AI Summary
“Essential Designs specializes in tailored enterprise software, mobile apps, and legacy modernization, delivering scalable, secure solutions for complex business workflows across diverse industries with 18+ years expertise.”
Truefit
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At Truefit, we assist a diverse clientele, ranging from entrepreneurs to executives, in developing innovative software products that both please users and foster business growth. We are firm believers that skilled, cross-disciplinary teams are essential for designing and building successful products
Highlights
$50,000+
Min Project Size
50-249
Employees
Pittsburgh, Pennsylvania, Us
Services Provided
50% Custom Web Application Development
35% Mobile App Development (iOS & Android)
15% Legacy System Modernization
AI Summary
“Truefit delivers innovative software products through skilled, cross-functional teams, prioritizing user satisfaction and business growth for clients from startups to executives.”
C
codEvolute
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We are a company that specializes in outsourced and offshore software development, aimed at assisting international clients in enhancing their software development capabilities and efficiently transforming their ideas into functional products in a cost-effective manner with minimal staff turnover. M
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Bad Homburg vor der Hohe, Hesse, De
Services Provided
70% Custom Web Application Development
10% Blockchain & Web3 Development
20% Legacy System Modernization
AI Summary
“codEvolute provides outsourced and offshore software development services, enabling international clients to efficiently transform ideas into products with flexible, cost-effective, and scalable solutions.”
Solvti Sp. z o. o.
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Solvti is a software company located in Wrocław, Poland, serving clients throughout Europe. As a certified Odoo Partner, we work with both Odoo Enterprise and Community projects. Established in 2021, our mission goes beyond just delivering software; we aim to address real business challenges. We spe
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Pl
Services Provided+2 Services
30% Other IT Consulting and SI
25% Legacy System Modernization
15% Software Development Services
10% Low-Code MVP Development
AI Summary
“Solvti Sp. z o. o. is a Polish software firm specializing in custom software, mobile apps, Odoo implementation, and IT consulting, delivering tailored business solutions across Europe.”
Wan Buffer Services
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Wan Buffer Services is a global entity and a prominent contributor to the Odoo Community. We focus on developing and implementing more than 50 Odoo business solutions, always utilizing the latest technology to fulfill our clients' requirements. Here’s a brief overview of our offerings: With a dedica
Highlights
$5,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Ahmedabad, Gujarat, In
Services Provided+1 Services
25% Custom Web Application Development
5% Mobile App Development (iOS & Android)
3% E-Commerce Development
17% Legacy System Modernization
AI Summary
“Wan Buffer Services is a global leader delivering over 50 advanced Odoo business solutions, leveraging cutting-edge technology to serve prominent international clients across various industries.”
Upgrade My Database
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We offer top-notch SQL Server and Azure database services tailored for mid-sized companies. Our services include database upgrades, software implementation, existing software conversions, and custom development. Reach out to us, and we'll assess your system, identify any challenges, and create a per
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Plano, Texas, Us
Services Provided
25% Other IT Consulting and SI
25% Software Development Services
25% Legacy System Modernization
25% Managed IT Services
AI Summary
“Upgrade My Database provides expert SQL Server and Azure database solutions for mid-sized companies, including upgrades, software implementation, conversions, and custom development tailored to client needs.”
Elan Tech
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Elan Technologies: Customized Software Solutions for Business Growth 🚀 At Elan Technologies, we develop personalized software solutions that enhance growth and efficiency in diverse sectors. Our digital transformation services enable companies to fully exploit their technological capabilities for l
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided+1 Services
30% Legacy System Modernization
20% Custom Web Application Development
20% Workflow Automation (Zapier / Make / n8n)
13% CRM Consulting and SI
AI Summary
“Elan Technologies specializes in personalized software development and digital transformation, delivering AI-driven automation and data-driven solutions to enhance efficiency and growth across diverse industries.”
SolutionsOne
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SolutionsOne™ develops high-quality business applications suitable for enterprises, including CRM and ERP systems, as well as tailored internal tools and SaaS platforms. Designed for specific purposes and focused on performance.
Highlights
$25,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Cypress, Texas, Us
Services Provided+1 Services
35% Custom Web Application Development
10% Mobile App Development (iOS & Android)
25% API Development & Integration
5% E-Commerce Development
AI Summary
“SolutionsOne specializes in developing high-performance business applications, including CRM, ERP, custom internal tools, and SaaS platforms tailored for enterprise needs.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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