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

BTS Software Solutions
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We are a comprehensive development firm that collaborates with clients to create outstanding products. Our startup mindset allows us to offer innovative and distinct solutions for each partner. Our teams consist of enthusiastic engineers from top industry startups and emerging companies.
Highlights
$100-149/hr
Avg Hourly Rate
10-49
Employees
Columbia, Maryland, Us
Services Provided
20% Mobile App Development (iOS & Android)
10% Legacy System Modernization
20% Custom Web Application Development
50% UX Audit & Heuristic Evaluation
AI Summary
“BTS Software Solutions is a collaborative development firm delivering innovative, customized products through expert engineers with a startup mindset, serving diverse client needs across industries.”
Perspective Technologies
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Perspective Technologies provides technology solutions that are based on open and standardized platforms. With 20 years of experience in creating and supporting effective solutions, including in tightly regulated financial environments, we are equipped to assist you whether you're developing a new s
Highlights
$1,000+
Min Project Size
2-9
Employees
Services Provided+2 Services
23% ECM Consulting and SI
3% IT Staff Augmentation
7% Other IT Consulting and SI
14% Legacy System Modernization
AI Summary
“Perspective Technologies delivers tailored technology solutions leveraging open platforms and robust tools, offering expertise across development, support, and guidance in regulated financial and diverse environments.”
14 Oranges Software
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14 Oranges is a top provider of comprehensive web and mobile application solutions designed to help customers achieve seamless user engagement and efficient operational management. Based in Richmond, BC, 14 Oranges offers its services to government entities, retail businesses, and large organization
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Vancouver, British Columbia, Ca
Services Provided+4 Services
16% Mobile App Development (iOS & Android)
3% E-Commerce Development
6% Legacy System Modernization
10% Product UX Strategy
AI Summary
“14 Oranges Software delivers comprehensive mobile-first web and app solutions, enabling efficient management and enhanced user engagement for governments, retailers, and large organizations globally.”
App Developer Studio
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We are a group of designers, developers, marketers, and project managers located in South Africa. We collaborate closely with a substantial team of skilled developers in India, with whom we have partnered for over a decade. This arrangement offers you the advantages of having a dedicated, experience
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Randburg, Gauteng, Za
Services Provided+2 Services
25% Mobile App Development (iOS & Android)
13% Custom Web Application Development
7% E-Commerce Development
5% Legacy System Modernization
AI Summary
“App Developer Studio is a South African-based team collaborating with skilled Indian developers, providing cost-effective, scalable software solutions managed by local project leaders for efficient delivery.”
Ezappsolution
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Explore the limitless potential of innovation and advanced Mobile, Web, Game, and Embedded technologies with EzappSolution. We take pride in serving a diverse range of satisfied customers globally for over a decade, delivering top-notch technologies and concepts. Our expertise in Web and Mobile Appl
Highlights
$10,000+
Min Project Size
< $25/hr
Avg Hourly Rate
1000-9999
Employees
Gurugram, Haryana, In
Services Provided+1 Services
20% Custom Web Application Development
20% Mobile App Development (iOS & Android)
8% E-Commerce Development
2% Legacy System Modernization
AI Summary
“EzappSolution specializes in innovative Mobile, Web, Game, and Embedded technologies, delivering high-quality applications and services globally with a skilled, client-focused team and strong quality control.”
ITSG Global
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We are ITSG Global, a forward-thinking software development firm dedicated to fostering growth and facilitating digital transformation. Since our inception in 2007, we have been leveraging advanced technologies in areas such as Big Data, VR, IoT, UI/UX, and Generative AI to create customized solutio
Highlights
50-249
Employees
Warszawa, Masovian, Pl
Services Provided+4 Services
28% Custom Web Application Development
5% Legacy System Modernization
10% Generative AI
8% Machine Learning Model Development
AI Summary
“ITSG Global is a software development firm specializing in bespoke digital transformation solutions, leveraging technologies like Big Data and AI to support clients across multiple industries and regions.”
Graphite GTC
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Unlock Your Business's Full Potential with Exceptional, Rapid, and Secure Web Solutions. Utilizing our advanced No-Code Application Development Platform, we create customized web applications designed specifically for your needs. By collaborating with prestigious organizations like Wharton Universit
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Bryn Mawr, Pennsylvania, Us
Services Provided
43% Custom Web Application Development
7% Legacy System Modernization
25% AI Strategy & Roadmap Consulting
25% Machine Learning Model Development
AI Summary
“Graphite GTC delivers tailored, secure web applications using a no-code platform, offering comprehensive development services that enhance business performance with proven expertise and rigorous quality standards.”
Apptitude
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Smart agents, automated systems, and AI solutions designed for practical applications in the real world.
Highlights
$50,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Services Provided
12% Legacy System Modernization
10% Mobile App Development (iOS & Android)
28% Custom Web Application Development
50% Web App UI Design
AI Summary
“Apptitude develops smart agents, automated systems, and AI solutions tailored for practical real-world applications, enhancing operational efficiency across diverse industries.”
C.L Soluções & Consultoria
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A C.L Soluções & Consultoria é uma empresa especializada em soluções digitais, originada da visão de um líder apaixonado por inovação e de uma equipe comprometida. Nossa experiência é resultado de projetos de grande porte realizados para empresas líderes do mercado, o que nos capacita a agregar valo
Highlights
$100-149/hr
Avg Hourly Rate
10-49
Employees
Sao Paulo, Sao Paulo, Br
Services Provided+1 Services
40% Custom Web Application Development
10% Legacy System Modernization
25% Business Model Design & Validation
15% Operational Process Consulting
AI Summary
“C.L Soluções & Consultoria specializes in scalable digital solutions, leveraging extensive expertise to deliver innovative, high-quality services that drive efficiency and sustainable growth across industries in Brazil.”
WeeCoder
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We are a technology firm dedicated to assisting startups in enhancing their technological capabilities. Our knowledge and experience have enabled us to support organizations ranging from newly public companies to Fortune 500 firms. At the heart of our mission is a commitment to transforming companie
Highlights
$5,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Services Provided
40% Custom Web Application Development
50% Mobile App Development (iOS & Android)
10% Legacy System Modernization
AI Summary
“WeeCoder provides tailored web and mobile app development, custom software solutions, and on-demand teams, empowering startups and enterprises with scalable, innovative technology for business growth.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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