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

Peru Apps
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Peru Apps, a subsidiary of MOVENTI Corporate, is a digital consulting firm with over seven years of experience providing business solutions, digital transformation, application development and maintenance, cloud deployment, innovation lab implementation, and IT outsourcing services.
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
San Isidro, Lima, Pe
Services Provided+12 Services
8% Custom Web Application Development
7% Mobile App Development (iOS & Android)
3% E-Commerce Development
5% Backend Development
AI Summary
“Peru Apps, part of MOVENTI Corporate, delivers comprehensive digital consulting services including business solutions, application development, cloud deployment, IT outsourcing, and innovation labs with over seven years' experience.”
Think Digitally
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Our goal is to empower our clients' aspirations by creating digital transformation solutions that are user-focused, seamless, and consistently valuable. At Think Digitally, we strongly believe that exceptional software emerges from collaborative excellence. Even on days when we may not feel particul
Highlights
$25,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
London, England, Gb
Services Provided+6 Services
8% Mobile App Development (iOS & Android)
10% Custom Web Application Development
6% API Development & Integration
1% Legacy System Modernization
AI Summary
“Think Digitally delivers user-centric digital transformation solutions, leveraging collaborative expertise to create seamless, valuable software that empowers clients and achieves shared objectives.”
Cloud Continuous
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We are a diverse agency that utilizes our expertise to provide innovative software solutions across various industries. From transforming manufacturing operations and supporting emerging startups to fostering innovation in fintech, enhancing B2B software, and advancing AI capabilities, our team is c
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+6 Services
7% Mobile App Development (iOS & Android)
14% Custom Web Application Development
8% Legacy System Modernization
5% Blockchain & Web3 Development
AI Summary
“Cloud Continuous is a versatile agency delivering innovative software solutions across industries, including manufacturing, startups, fintech, B2B software, and AI, dedicated to exceeding project goals.”
AMIT GROUP
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AMIT GROUP consists of a network of IT companies committed to collaboration as a Joint Stock Company. Our team operates across various Information Technology sectors to collectively support, improve, and innovate. We specialize in outsourcing and the creation of custom software solutions using conte
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Ho Chi Minh City, Vn
Services Provided+20 Services
6% Mobile App Development (iOS & Android)
6% Custom Web Application Development
4% Backend Development
3% Frontend Development
AI Summary
“AMIT GROUP is a Vietnam-based IT network delivering custom software, UI/UX design, AI-driven automation, and business consulting services to optimize operations and foster innovation.”
Fraktio
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We create essential digital services for businesses and provide training for professionals in design and technology.
Highlights
$25,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Helsinki, Uusimaa, Fi
Services Provided+6 Services
15% Custom Web Application Development
10% Mobile App Development (iOS & Android)
10% API Development & Integration
5% DevOps Engineering
AI Summary
“Fraktio provides comprehensive digital services including software development, UI/UX design, enterprise app modernization, API integration, and professional training for design and technology professionals.”
DURABLE CODER PRIVATE LIMITED
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At Durable Coder, we don't just create websites and apps; we turn your concepts into successful digital businesses. Our people-focused approach guarantees that we develop, brand, and promote your vision with precise attention to detail and a commitment to quality. Our talented team of innovative pro
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided+6 Services
13% Custom Web Application Development
13% Mobile App Development (iOS & Android)
7% API Development & Integration
7% SaaS Product Development
AI Summary
“Durable Coder Private Limited develops tailored websites and apps, combining innovative design and strategic expertise to help founders successfully launch and grow digital businesses.”
Burble Studio
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We believe that the right website can enhance your business by fostering growth and improving your workflows, allowing your team to achieve more than ever. While we will create an aesthetically pleasing website, our focus goes beyond just design; we are strategists. We analyze, experiment, and refi
Highlights
$5,000+
Min Project Size
2-9
Employees
Services Provided+4 Services
28% Custom Web Application Development
5% Legacy System Modernization
13% Product UX Strategy
10% Web App UI Design
AI Summary
“Burble Studio crafts strategically designed websites that enhance business growth by attracting traffic, boosting lead conversion, and showcasing expertise through optimized, user-focused online platforms.”
Code19
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Code19 is a tech company that focuses on tailored software development, mobile app creation, cybersecurity, cloud systems, and SaaS solutions. Located in North Brunswick, New Jersey, we collaborate with organizations to provide scalable and secure solutions, covering everything from foundational arc
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided+4 Services
14% Custom Web Application Development
13% Mobile App Development (iOS & Android)
7% Legacy System Modernization
10% AI Strategy & Roadmap Consulting
AI Summary
“Code19 is a New Jersey-based tech company offering tailored software development, mobile apps, cybersecurity, cloud systems, and SaaS solutions focusing on scalable, secure, and outcome-driven services.”
iScale Solutions
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As a custom outsourcing service provider situated in areas rich with top talent, we link businesses from the US, UK, Canada, Australia, and French-speaking nations with some of the world’s most talented professionals. This helps to promote innovation and growth while delivering considerable savings
Highlights
$5,000+
Min Project Size
< $25/hr
Avg Hourly Rate
250-999
Employees
Makati, Ph
Services Provided+10 Services
6% Custom Web Application Development
2% Legacy System Modernization
3% Mobile App Development (iOS & Android)
2% E-Commerce Development
AI Summary
“iScale Solutions provides custom IT staff augmentation and outsourcing services, connecting businesses worldwide with top software development talent to drive innovation and reduce costs.”
Microsec Limited
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Established in 1979, Microsec is among the oldest software development and support firms in the UK. From the outset, we have crafted, developed, and maintained software solutions utilizing nearly all current mainstream technologies. Microsec has consistently adapted to stay aligned with the latest a
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Services Provided+3 Services
7% Mobile App Development (iOS & Android)
8% QA & Software Testing
15% Custom Web Application Development
3% Legacy System Modernization
AI Summary
“Microsec Limited, established in 1979, is a UK-based software development firm known for technical excellence and versatile solutions across major industries, leveraging evolving technologies and expertise.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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