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

WebBrewery Agency
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We are a Webflow development agency based in the UK, dedicated to delivering optimal user experiences and exceptional loading speeds! We implement our proprietary Brew Method strategy for all the websites we create for our clients, which significantly boosts conversion rates.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Szekesfehervar, Fejer, Hu
Services Provided+3 Services
18% Custom Web Application Development
5% E-Commerce Development
2% Legacy System Modernization
15% Product UX Strategy
AI Summary
“WebBrewery Agency, a UK-based Webflow specialist, enhances websites using a proprietary Brew Method, ensuring exceptional user experiences, fast loading speeds, and improved conversion rates.”
Bytesavy Technologies
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ByteSavy Technologies is a custom software development firm focused on the agriculture and oil & gas sectors. We collaborate with producers, agricultural enterprises, and energy operators throughout Western Canada to create software solutions that align with their operational methods. Our team combi
Highlights
$10,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Brandon, Manitoba, Ca
Services Provided+6 Services
18% Custom Web Application Development
8% Mobile App Development (iOS & Android)
10% API Development & Integration
13% Backend Development
AI Summary
“Bytesavy Technologies delivers custom software solutions for agriculture and oil & gas sectors in Western Canada, integrating technical expertise with industry experience to optimize client workflows.”
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Onefourseven Labs
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Highlights
$10,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Services Provided+3 Services
15% Custom Web Application Development
13% E-Commerce Development
12% API Development & Integration
10% Legacy System Modernization
AI Summary
“Onefourseven Labs is a technology-driven company focused on developing innovative software solutions, leveraging expertise to deliver versatile products that enhance business efficiency and user engagement.”
Qaribuhub Solutions LTD
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Qaribuhub is a premier software development and artificial intelligence firm located in Nairobi, Kenya, dedicated to assisting businesses throughout East Africa in creating scalable and high-performance digital solutions. With over 7 years of experience and more than 100 successful projects, we comb
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+5 Services
8% Custom Web Application Development
7% API Development & Integration
5% E-Commerce Development
10% Mobile App Development (iOS & Android)
AI Summary
“Qaribuhub Solutions LTD. is a Nairobi-based software and AI firm delivering scalable, secure digital solutions across East Africa, specializing in custom development, AI integration, mobile apps, and payment systems.”
allaboutapps
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allaboutapps is a premier full-service software agency headquartered in Vienna, specializing in bespoke mobile, web, and AI solutions for businesses. We assist companies in developing, optimizing, and scaling their digital products—from initial concept to launch—while emphasizing performance, user e
Highlights
$10,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
50-249
Employees
Vienna, Vienna, At
Services Provided+9 Services
7% Custom Web Application Development
12% Mobile App Development (iOS & Android)
3% E-Commerce Development
7% Backend Development
AI Summary
“allaboutapps is a Vienna-based full-service software agency delivering tailored mobile, web, AI, and cloud solutions, emphasizing performance, scalability, and user experience for diverse businesses.”
Mindpath Technology Limited
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Mindpath Technology provides effective IT services and solutions aimed at delivering high-quality results for its clients. Since our founding, we have prioritized excellence and the creation of outstanding solutions to address real challenges. We value innovation and strive to develop products that
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Indore, Madhya Pradesh, In
Services Provided+26 Services
4% Backend Development
1% Legacy System Modernization
1% ERP & CRM Development
3% Progressive Web App (PWA) Development
AI Summary
“Mindpath Technology Limited specializes in innovative IT solutions, including AI, DevOps, cloud migration, and app development, prioritizing quality, client needs, and collaborative success.”
tweakco
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At tweakco, we go beyond being just a technology firm; we are your allies in navigating the constantly changing digital realm. We are convinced that innovation has the potential to change concepts into real-world solutions. As product consultants, we carefully listen to your vision and comprehend yo
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided+6 Services
12% Custom Web Application Development
7% API Development & Integration
3% Legacy System Modernization
3% QA & Software Testing
AI Summary
“Tweakco specializes in crafting custom software solutions that blend advanced technology with user-focused design, supporting clients through digital transformation and realizing their innovation goals.”
AYN INFOTECH LIMITED
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Your Satisfaction is Our Success: We aim to build a smarter world through innovative concepts, strategies, and methods to provide tailored products, services, and solutions.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Pimpri-Chinchwad, Maharashtra, In
Services Provided+13 Services
4% Custom Web Application Development
3% Mobile App Development (iOS & Android)
4% SaaS Product Development
2% E-Commerce Development
AI Summary
“AYN INFOTECH LIMITED delivers innovative, tailored products and solutions, leveraging strategic methods to create smarter, customer-focused technology experiences ensuring client satisfaction and success.”
SAS Shack India
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Founded in 2009, SAS Shack India is an ISO 9001-2008 certified web and software development company based in India, dedicated to offering software outsourcing and website development services to international firms. With over 1500 completed projects and more than 400 satisfied clients in 32 countrie
Highlights
10-49
Employees
Services Provided+2 Services
25% Custom Web Application Development
20% Mobile App Development (iOS & Android)
5% Legacy System Modernization
20% Product UX Strategy
AI Summary
“Founded in 2009, SAS Shack India is an ISO-certified IT company delivering diverse software, web, and mobile solutions globally via innovative, cost-effective, and simplified technologies.”
Relay Software
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Relay Software is a Romanian firm that offers cutting-edge IT solutions to businesses across various sectors.
Highlights
$25-49/hr
Avg Hourly Rate
2-9
Employees
Bucuresti, Bucuresti, Ro
Services Provided+2 Services
25% Custom Web Application Development
20% Mobile App Development (iOS & Android)
5% Legacy System Modernization
20% Product UX Strategy
AI Summary
“Relay Software is a Romanian IT company providing innovative technology solutions tailored to diverse industries, enhancing business efficiency and digital transformation with advanced software services.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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