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

PureSoftware
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PureSoftware is a company that provides software products and services aimed at enhancing customer experiences, speeding up processes, and improving business results by integrating digital solutions, robotic process automation, artificial intelligence, machine learning, and the Internet of Things (I
Highlights
250-999
Employees
Noida, Uttar Pradesh, In
Services Provided+7 Services
8% Custom Web Application Development
7% Mobile App Development (iOS & Android)
8% Backend Development
5% Blockchain & Web3 Development
AI Summary
“PureSoftware delivers advanced digital solutions, integrating AI, IoT, and automation to enhance business efficiency, notably through its fintech platform 'Arttha' for banking and wallets.”
AnchorStackTech
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AnchorStackTech is a software development firm that aids startups and expanding companies in creating dependable digital solutions. Our expertise lies in web development, mobile applications, AI-driven solutions, ERP systems, blockchain software, and desktop applications. We prioritize practical and
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Chicago, Illinois, Us
Services Provided+6 Services
5% E-Commerce Development
8% Mobile App Development (iOS & Android)
7% API Development & Integration
10% SaaS Product Development
AI Summary
“AnchorStackTech is a software development company specializing in scalable digital solutions including web, mobile, AI, ERP, blockchain, and desktop applications to support startups and growing businesses.”
Pixel Dock
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Vytváříme úspěšné webové stránky a internetové obchody. Zaměřujeme se na modernizaci starších webů. Podporujeme digitalizaci podnikání a sdílíme naše znalosti z oblasti online prostředí.
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided+3 Services
12% Custom Web Application Development
12% E-Commerce Development
10% Legacy System Modernization
10% Product UX Strategy
AI Summary
“Pixel Dock specializes in creating and modernizing websites and online stores, supporting business digitalization and sharing expertise in the online environment to drive success.”
Sii Poland
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Sii Poland is the top provider of technology consulting, digital transformation, engineering, and business services in the country. We began as a solo startup in 2006 and have now grown to a team of over 7,500 professionals, with 14 offices in Poland and 3 international locations (Sweden, Ukraine, I
Highlights
1000-9999
Employees
Warszawa, Masovian, Pl
Services Provided+9 Services
8% API Development & Integration
5% Legacy System Modernization
7% Custom Web Application Development
6% UX Research & Usability Testing
AI Summary
“Sii Poland is a leading technology consulting and engineering firm, delivering digital transformation and business services across diverse industries with a global team of over 7,500 experts.”
Tapflow
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Share the details of your project with us, and we will match you with the appropriate agency, facilitate the agreement, and manage the payment process on your behalf!
Highlights
$5,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided+2 Services
20% Custom Web Application Development
15% Mobile App Development (iOS & Android)
5% Blockchain & Web3 Development
10% Legacy System Modernization
AI Summary
“Tapflow streamlines project collaboration by matching clients with suitable agencies, facilitating agreements, and managing payments, ensuring efficient and seamless project execution.”
Stranded Solutions
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Connecting ambition with execution. You understand your business's requirements clearly, but you lack the time, technical expertise, or capacity for vendor management to turn those ideas into reality. That's where we step in. Stranded Solutions is here for times when a project encounters difficultie
Highlights
$1,000+
Min Project Size
2-9
Employees
London, England, Gb
Services Provided+3 Services
20% Custom Web Application Development
13% Mobile App Development (iOS & Android)
5% E-Commerce Development
7% QA & Software Testing
AI Summary
“Stranded Solutions bridges project gaps by managing complexities, sourcing experts, and ensuring accountability, enabling businesses to realize ambitions without technical or vendor management challenges.”
Lycaon Ltd.
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We are a compact, high-performing team that provides services in Scrum and PRINCE2. We prioritize close collaboration with our clients to maximize the value of our code. Our delivery schedule features biweekly updates of functional products. If you're frustrated with prolonged deadlines, extensive i
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Prague, Prague, Cz
Services Provided+4 Services
28% Custom Web Application Development
5% Legacy System Modernization
5% Mobile App UI Design
10% Product UX Strategy
AI Summary
“Lycaon Ltd. is an agile-focused team specializing in Scrum and PRINCE2 methodologies, delivering functional software biweekly through close client collaboration and efficient, adaptive processes.”
Bigbee Technology Limited
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At Bigbee, we prioritize delivering value for money to our clients. Our team consists of seasoned service providers, Cisco-certified networking professionals, and top software developers in the country, backed by nearly a decade of industry experience. We are your trusted option for consulting servi
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Dar es Salaam, Tz
Services Provided+5 Services
13% Network Architecture & Configuration
4% IT Compliance & Governance
5% Managed IT Services
4% Cybersecurity Assessments & Hardening
AI Summary
“Bigbee Technology Limited offers expert consulting services, leveraging nearly a decade of experience with Cisco-certified networking professionals and leading software developers to deliver value-driven solutions.”
Coder Oxygen Pvt Ltd
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Our goal is to revitalize businesses by offering innovative software solutions. Coder Oxygen is a prominent software firm that provides a wide array of IT services, such as software development, digital sourcing, and beyond. Our team of experts collaborates closely with clients to identify their dis
Highlights
10-49
Employees
Services Provided+2 Services
13% API Development & Integration
13% Backend Development
10% Mobile App Development (iOS & Android)
7% Legacy System Modernization
AI Summary
“Coder Oxygen Pvt Ltd offers innovative software development and IT services, collaborating closely with clients to deliver tailored solutions that enhance operations across diverse business sectors.”
Gyizer
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At Gyizer, we strive to make cutting-edge technology available to all. We are dedicated to maintaining the highest standards of integrity while fostering strong connections with individuals. Our core values guide all our actions. The essence of Gyizer lies in a culture of trust and a shared ambition
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Indore, Madhya Pradesh, In
Services Provided+4 Services
13% Custom Web Application Development
3% Legacy System Modernization
10% Mobile App Development (iOS & Android)
11% Web App UI Design
AI Summary
“Gyizer delivers comprehensive IT solutions including software development, UX/UI design, IT consulting, and cloud infrastructure services, committed to innovation, integrity, and enhancing client experiences globally.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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