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

AKCA YAZILIM VE TEKNOLOJİ ANONİM ŞİRKETİ
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Akcatech is a technology-driven company that focuses on software architecture and cloud infrastructure. With two decades of experience in the industry, we provide straightforward and effective solutions for even the most challenging technological demands. Our goal at Akcatech is to advance software
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided+6 Services
20% Custom Web Application Development
8% Progressive Web App (PWA) Development
5% Legacy System Modernization
12% AI Strategy & Roadmap Consulting
AI Summary
“Akcatech specializes in software architecture and cloud infrastructure, delivering innovative, effective solutions to enhance digital business success with two decades of industry expertise.”
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FourtaDev
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FourtaDev is a web and mobile development company founded in 2024. We unite a team of talented freelancers to provide responsive, secure, and scalable digital solutions aimed at achieving tangible results, developed through close collaboration with our clients.
Highlights
< $25/hr
Avg Hourly Rate
Probolinggo, Id
Services Provided+1 Services
20% Custom Web Application Development
15% Mobile App Development (iOS & Android)
10% E-Commerce Development
5% Legacy System Modernization
AI Summary
“FourtaDev, founded in 2024, offers responsive and scalable web and mobile development solutions through a skilled freelancer team, focusing on secure digital products and client collaboration.”
Cognitum Services SA
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Established in 2010, Cognitum is a software development company with specialized knowledge in the scientific domain. We partner with businesses of all sizes—startups, growing enterprises, and large corporations—counting Fortune 100 firms like Nokia, Airbus, and Roche among our clients. Why choose Co
Highlights
$10,000+
Min Project Size
10-49
Employees
Warszawa, Masovian, Pl
Services Provided+11 Services
8% Mobile App Development (iOS & Android)
3% Legacy System Modernization
5% Code Review & Technical Audits
8% API Development & Integration
AI Summary
“Cognitum Services SA, founded in 2010, offers expert software development across industries, specializing in AI, machine learning, and semantic web technologies for clients from startups to Fortune 100 companies.”
Cloud Consulting Inc.
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About Cloud Consulting Inc. - Transforming Your Technology. Established in 2021 and based in Atlanta, Georgia, Cloud Consulting Inc. (CCI) is your reliable partner for co-innovating and transforming your technology with our unbiased Advisory, Managed, and Professional Services. Our Promise: Secure,
Highlights
$50,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
250-999
Employees
Norcross, Georgia, Us
Services Provided+12 Services
9% Robotic Process Automation (RPA)
6% AI Strategy & Roadmap Consulting
4% AI Model Fine-Tuning & Training
1% Other IT Consulting and SI
AI Summary
“Cloud Consulting Inc. delivers innovative, scalable technology solutions including AI-driven automation, cloud infrastructure, software development, CRM management, and IT services to drive business growth.”
IT-LEAD.EU | Software Outsourcing Company - Out of Business
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IT-Lead is a software outsourcing firm that specializes in IT outsourcing and outstaffing to facilitate effective digital transformation. Our team consists of over 100 experts based throughout Europe. With our vast experience in E-commerce, Logistics, Finance, and Healthcare, we are equipped to deli
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Krakow, Lesser Poland, Pl
Services Provided+6 Services
11% E-Commerce Development
9% Custom Web Application Development
4% Mobile App Development (iOS & Android)
1% Legacy System Modernization
AI Summary
“IT-Lead was a European software outsourcing company specializing in IT outsourcing and outstaffing across E-commerce, Logistics, Finance, and Healthcare sectors, delivering tailored digital transformation solutions.”
Dextechnology
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Our primary focus is on creating intricate software systems and mobile applications to address the IT needs of small and medium-sized enterprises. We have acquired significant experience as both a local and remote development team.
Highlights
$25,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+7 Services
15% Mobile App Development (iOS & Android)
8% Frontend Development
8% API Development & Integration
5% QA & Software Testing
AI Summary
“Dextechnology specializes in developing complex software and mobile applications, delivering tailored IT solutions for small and medium-sized enterprises through local and remote teams.”
Dev, in.
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A consulting firm specializing in guiding clients through the development, implementation, or enhancement of reliable AI, mobile, and web applications. It also provides support with lean and enterprise architecture. The firm’s specialists advise on creating secure and effective technological solutio
Highlights
$25,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Services Provided+8 Services
30% Mobile App Development (iOS & Android)
15% Machine Learning Model Development
14% Other IT Consulting and SI
8% Software Development Services
AI Summary
“Dev, in.. is a consulting firm expert in developing and enhancing AI, mobile, and web applications, while providing lean and enterprise architecture guidance to optimize secure, compliant digital solutions.”
Basal Smart Solutions
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The development team at Basal Smart Solutions possesses extensive experience and knowledge across various technologies. This expertise allows us to improve and optimize existing technology infrastructures, as well as suggest and implement new technologies to effectively automate business processes a
Highlights
$25,000+
Min Project Size
10-49
Employees
Dallas, Texas, Us
Services Provided+8 Services
3% Mobile App Development (iOS & Android)
6% Legacy System Modernization
5% ERP & CRM Development
5% Backend Development
AI Summary
“Basal Smart Solutions leverages extensive technical expertise to enhance infrastructure and implement innovative technologies, automating and optimizing business processes across industries.”
Mindgrap Technologies
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As a software development firm, we are excited to provide tailored and high-quality services for developing mobile and web applications or portal software. We utilize a variety of technologies, including Cloud, ERP, PHP, Open Source, BI, and Mobile. With extensive experience in Cloud-based and mobil
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Services Provided+15 Services
8% Mobile App Development (iOS & Android)
7% Custom Web Application Development
5% Backend Development
3% Frontend Development
AI Summary
“Mindgrap Technologies delivers tailored software solutions including mobile, web, ERP, AI, and automation services, emphasizing UX/UI design to enhance usability across diverse industries.”
Nar Technology Services
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Nar is a provider of technology services that delivers managed solutions and project-oriented resources. Our developers work full-time as integral team members with our partner clients and are based at Nar’s headquarters in Turkey. We utilize agile development practices, and our developers specializ
Highlights
$25,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Istanbul, Istanbul, Tr
Services Provided+2 Services
30% Custom Web Application Development
20% API Development & Integration
20% Backend Development
15% Frontend Development
AI Summary
“Nar Technology Services offers managed technology solutions with specialized developers in multiple programming languages and DevOps tools, employing agile practices from its headquarters in Turkey.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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