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

Monkey and River
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At Monkey and River, we combine agility and boldness in the realm of software design and development. Since 2015, we've been creating tailored digital solutions that go beyond industry standards to redefine them. Our name embodies our philosophy: nimble like a monkey, daring like a river, and always
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Centurion, Gauteng, Za
Services Provided+4 Services
15% Legacy System Modernization
10% Custom Web Application Development
8% UX Research & Usability Testing
7% Product UX Strategy
AI Summary
“Monkey and River delivers innovative, human-centric software solutions across web, mobile, cloud, and UX, emphasizing collaboration and behavioral insights to modernize and enhance client businesses.”
Esseal LTD
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Esseal is a senior-led custom software engineering company based in England and Wales (Company No. 17026190), with locations in London and Lahore. We create, improve, and modernize software for startups, small and medium-sized enterprises (SMEs), and large organizations in the UK, US, and around the
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Lahore, Pk Punjab, Pk
Services Provided
45% Custom Web Application Development
25% API Development & Integration
20% E-Commerce Development
10% Legacy System Modernization
AI Summary
“Esseal LTD. is a senior-led UK-based custom software engineering firm delivering timely, budget-conscious solutions for diverse sectors, emphasizing direct client-engineer collaboration and accountability.”
Radial Development Group, LLC
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Radial Development Group holds the view that the true value of our efforts is realized only when they reach our clients, their users, and their customers. We create processes aimed at facilitating significant, incremental enhancements every two weeks. Our clients anticipate a product that continuall
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Loveland, Colorado, Us
Services Provided+2 Services
30% Software Development Services
30% Mobile App Development (iOS & Android)
15% Custom Web Application Development
10% Legacy System Modernization
AI Summary
“Radial Development Group specializes in delivering continuously evolving products through bi-weekly incremental improvements, providing clients with both solutions and sustainable enhancement processes.”
DeltaByte Solutions
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En DeltaByte Solutions SAS, promovemos la transformación digital de empresas en Colombia y en el extranjero mediante soluciones tecnológicas completas, creadas para producir resultados concretos, medibles y sostenibles.
Highlights
2-9
Employees
Palmira, Valle Del Cauca, Co
Services Provided+1 Services
15% Mobile App Development (iOS & Android)
20% Custom Web Application Development
10% Legacy System Modernization
5% E-Commerce Development
AI Summary
“DeltaByte Solutions SAS drives digital transformation for businesses in Colombia and internationally by delivering comprehensive technological solutions that ensure measurable, sustainable outcomes.”
Xano, Inc.
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No Code Backend Development Platform. Xano offers a scalable backend, a versatile database, a ready-to-use API, and a No Code business logic builder that allows you to easily transform data from any source. Quickly create business logic without coding. Utilize templates and extensions to speed up yo
Highlights
10-49
Employees
Los Angeles, California, Us
Services Provided+1 Services
50% Custom Web Application Development
20% Software Development Services
10% Legacy System Modernization
10% Low-Code MVP Development
AI Summary
“Xano, Inc. provides a scalable no-code backend platform enabling rapid development of customizable web and mobile applications, with integrated APIs and business logic tools for seamless integration.”
CODEVENOM - old SkillsForge
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Scalable systems with confidence. We specialize in developing and enhancing systems using PHP (Symfony/Laravel) and React. We can take over existing legacy codebases to stabilize and upgrade them, or create new solutions from the ground up, ranging from MVPs to intricate B2B platforms. Our approach
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Warszawa, Masovian, Pl
Services Provided+5 Services
7% API Development & Integration
5% Mobile App Development (iOS & Android)
12% Legacy System Modernization
10% Custom Web Application Development
AI Summary
“CODEVENOM specializes in developing and upgrading scalable PHP and React systems, delivering reliable, methodical solutions from legacy stabilization to new B2B platforms with clear communication.”
Dev.Pro
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Dev.Pro is a software development partner that helps innovative tech companies realize their growth objectives and accelerate their time-to-market. Focused on results and committed to quality, Dev.Pro assembles teams that provide customized software development solutions tailored to various skill le
Highlights
$50,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
250-999
Employees
Las Vegas, Nevada, Us
Services Provided+5 Services
10% QA & Software Testing
3% ERP & CRM Development
7% Blockchain & Web3 Development
5% Code Review & Technical Audits
AI Summary
“Dev.Pro is a global software development partner offering custom solutions in AI, cloud, blockchain, DevOps, and UX/UI design, supporting diverse industries with over 850 skilled professionals.”
Appworks Technologies
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Appworks has a singular goal: to deliver appealing, user-friendly, functional, and reliable systems within set timelines and budgets. Since our establishment in 2007, Appworks has been at the forefront of custom software development. We specialize in creating high-performance custom software for bot
Highlights
$100-149/hr
Avg Hourly Rate
10-49
Employees
Services Provided
50% Custom Web Application Development
40% Mobile App Development (iOS & Android)
10% Legacy System Modernization
AI Summary
“Appworks Technologies delivers high-quality, user-friendly custom software for mobile and web platforms, combining skilled professionals and cutting-edge technologies to ensure reliable, on-time project completion.”
Accesa
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Accesa is a prominent technology firm based in Cluj-Napoca, with additional offices in Oradea and two decades of experience transforming business challenges into growth opportunities. As a value-driven organization, it has positioned itself as a preferred partner for leading brands in the Retail, Ma
Highlights
$50,000+
Min Project Size
1000-9999
Employees
Cluj-Napoca, Cluj, Ro
Services Provided+5 Services
8% Legacy System Modernization
18% Custom Web Application Development
6% Machine Learning Model Development
4% Robotic Process Automation (RPA)
AI Summary
“Accesa is a Romanian technology firm specializing in digital transformation and software development, serving Retail, Manufacturing, and Financial sectors with over 1,200 IT professionals across multiple offices.”
Netpace Inc.
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Netpace Inc. is a professional services firm focused on data-driven solutions in enterprise software, cloud services, and workforce management. Our data-oriented offerings empower clients to simplify complex intelligent processes, facilitating digital transformation. We partner with a wide range of
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
50-249
Employees
San Ramon, California, Us
Services Provided
43% Custom Web Application Development
7% Legacy System Modernization
45% IT Staff Augmentation
5% Other IT Consulting and SI
AI Summary
“Netpace Inc. delivers data-driven enterprise software, cloud, and workforce management solutions, partnering globally to streamline operations and provide innovative staffing, especially in healthcare.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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