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

Bluelupin Technologies
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Bluelupin is a consultancy specializing in digital transformation, particularly in web and mobile app development, Salesforce integration, and application modernization. We provide customized software solutions to businesses of all sizes, ranging from dedicated product teams to bespoke software deve
Highlights
$10,000+
Min Project Size
< $25/hr
Avg Hourly Rate
50-249
Employees
Noida, Uttar Pradesh, In
Services Provided
35% Custom Web Application Development
35% Mobile App Development (iOS & Android)
15% E-Commerce Development
15% Legacy System Modernization
AI Summary
“Bluelupin Technologies specializes in digital transformation, offering tailored web and mobile app development, Salesforce integration, and application modernization to help businesses embrace new technologies and grow.”
American Team
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We focus on modernizing outdated systems by integrating the latest technologies and developing tailored modules for unique business functions, creating a strong and flexible framework for a variety of customized business solutions.
Highlights
2-9
Employees
Services Provided
24% Legacy System Modernization
10% Custom Web Application Development
33% Brand Identity Design
33% Social Media Marketing
AI Summary
“American Team specializes in modernizing legacy systems by implementing advanced technologies and custom modules, delivering robust, adaptable solutions tailored to diverse business needs.”
DeepSoft
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DeepSoft is a software development firm that specializes in creating software and managing systems of high and medium complexity. These systems often necessitate efficient algorithms, accurate and dependable data structures, and user-friendly graphical interfaces. We aim to deliver solutions across
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided
15% Legacy System Modernization
35% Custom Web Application Development
50% Other IT Consulting and SI
AI Summary
“DeepSoft develops complex software systems featuring efficient algorithms and reliable data structures, delivering user-friendly solutions that integrate scientific and business challenges across diverse sectors.”
Sysbunny
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SysBunny excels in the mobile app development sector, boasting a skilled team of in-house developers, innovative designers, analysts, and project managers, all of whom possess extensive experience in their respective areas. With over 8 years of experience, SysBunny has successfully created outstandi
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Waukee, Iowa, Us
Services Provided
15% Custom Web Application Development
75% Mobile App Development (iOS & Android)
10% Legacy System Modernization
AI Summary
“SysBunny is a proficient mobile app development company with over 8 years of experience, delivering innovative, high-quality applications across diverse sectors such as e-commerce, health, and education.”
DIGI APP LABS
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Digi App Labs specializes in mobile app development for start-ups, entrepreneurs, innovators, and businesses. We collaborate closely with our clients, aiming to help them harness the mobile revolution by transforming their ideas into market-ready apps or enhancing their internal operations.
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Surrey, British Columbia, Ca
Services Provided
75% Mobile App Development (iOS & Android)
15% Custom Web Application Development
10% Legacy System Modernization
AI Summary
“DIGI APP LABS is a Canadian software development firm specializing in mobile and custom apps, collaborating with clients to deliver innovative, market-ready solutions across diverse industries.”
Atomic Object
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Atomic Object develops tailored software solutions that help our clients achieve their business goals. Our team, located in the U.S., creates new products, improves current offerings, modernizes outdated systems, and incorporates AI into clients' software infrastructures. As an employee-owned compan
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Grand Rapids, Michigan, Us
Services Provided+1 Services
30% Custom Web Application Development
20% Mobile App Development (iOS & Android)
20% API Development & Integration
15% SaaS Product Development
AI Summary
“Atomic Object is a U.S.-based, employee-owned software firm delivering custom solutions, modernizing systems, and integrating AI to advance clients' business objectives across industries.”
VOKENT creative digital agency
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Vokent is an innovative digital agency. Our varied team of strategists, producers, developers, and designers produces impactful and collaborative digital products and services. We provide Brand Strategy, Web Design and Development, Social Media, Mobile Solutions, Product Design, and Content Creation
Highlights
$100,000+
Min Project Size
2-9
Employees
Services Provided+6 Services
25% Legacy System Modernization
8% Product UX Strategy
5% UX Research & Usability Testing
6% Mobile App UI Design
AI Summary
“VOKENT creative digital agency delivers innovative digital solutions encompassing app modernization, UX/UI design, branding, digital strategy, and product development to enhance brand engagement and performance.”
Modeso
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Modeso is a Swiss technology partner specializing in comprehensive custom software development for DACH enterprises. With its headquarters in Switzerland and a robust development center in Egypt, we assist mid-to-large organizations in modernizing legacy systems, integrating AI solutions, and enabli
Highlights
$50,000+
Min Project Size
50-249
Employees
Zurich, Zurich, Ch
Services Provided+3 Services
25% Custom Web Application Development
10% Mobile App Development (iOS & Android)
15% Legacy System Modernization
15% AI Strategy & Roadmap Consulting
AI Summary
“Modeso is a Swiss technology partner offering custom software development, AI integration, and digital transformation services to DACH enterprises, combining Swiss-quality oversight with cost-efficient delivery.”
ARTIN
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ARTIN converts intricate business issues into sophisticated software solutions. Since our inception in 1998, we have assisted companies in innovating, modernizing, and digitizing their operations. We serve as both your development team and strategic technology partner, tackling complex challenges th
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
250-999
Employees
Brno, South Moravia, Cz
Services Provided+2 Services
20% Machine Learning Model Development
20% Software Development Services
20% Legacy System Modernization
20% IT Staff Augmentation
AI Summary
“ARTIN, with over 25 years' expertise, delivers tailored software solutions, AI integration, and legacy modernization across industries, serving as a strategic technology partner ensuring client satisfaction.”
Nika Craft
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Top-notch quality, backed by over 20 years of experience! Since 1995, we have served major clients in the EU and Japan. Our time-efficient approach includes teams of skilled engineers and international management technologies for streamlined business operations. We offer cost-effective projects with
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Kyiv, Kv, Ua
Services Provided
40% Custom Web Application Development
15% Legacy System Modernization
25% Backend Development
20% Frontend Development
AI Summary
“Nika Craft, based in Kyiv since 1995, delivers cost-effective custom software and enterprise app modernization, specializing in web and IoT solutions with experienced international teams.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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