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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We evaluate companies on verified profile data: services, pricing, locations, and portfolio. Client reviews are being collected. We may earn a fee for some placements. How we rank and verify

4,482 Companies

List of the Best Legacy System Modernization Agencies

Yozu
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From mobile applications to SaaS solutions and everything in between, we partner with you to determine how technology can most effectively support your business. We prioritize listening, collaborating, and creating. Our approach involves tackling complex challenges with innovative, user-centered sol
Highlights
$50,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Liverpool, England, Gb
Services Provided
40% Custom Web Application Development
30% Mobile App Development (iOS & Android)
10% Legacy System Modernization
20% Frontend Development
AI Summary
“Yozu is a Liverpool-based team delivering global software development services, specializing in innovative, secure, and scalable technology solutions through collaborative, user-centered approaches.”
CodeWheel AI
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CodeWheel AI is an AI consulting firm prioritizing security, led by a seasoned engineer with over 15 years of experience. I specialize in creating robust AI platforms, including Retrieval-Augmented Generation (RAG) systems, automated agent workflows, vector search capabilities, and scalable multi-te
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
Services Provided+3 Services
12% AI Agent & Multi-Agent System Development
3% AI Strategy & Roadmap Consulting
5% Custom AI Chatbot Development
14% AI Model Fine-Tuning & Training
AI Summary
“CodeWheel AI delivers secure, scalable AI consulting services specializing in robust platform development, secure RAG and agent workflows, multi-tenant SaaS architectures, and comprehensive AI security assessments.”
miWARP
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We possess extensive expertise in software development and project management. Throughout the years, we have faced numerous challenges across more than 10 industries, all of which we have successfully resolved!
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Skopje, Skopje, Mk
Services Provided
40% Custom Web Application Development
30% Mobile App Development (iOS & Android)
10% Legacy System Modernization
20% Backend Development
AI Summary
“miWARP leverages extensive software development and project management expertise to deliver effective solutions across over 10 industries, consistently overcoming complex challenges.”
MBiz Software
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We are a group of technology experts and business strategists dedicated to finding innovative yet practical solutions for digital transformation. We empathize with our clients' challenges and recognize that they need to focus on their core business rather than managing software solutions or IT vendo
Highlights
$5,000+
Min Project Size
10-49
Employees
Nittambuwa, Western Province, Lk
Services Provided+2 Services
18% Custom Web Application Development
13% Mobile App Development (iOS & Android)
7% Legacy System Modernization
7% Backend Development
AI Summary
“MBiz Software delivers tailored software development, mobile apps, enterprise modernization, and IT managed services, combining technical expertise with business strategy to enable clients' digital transformation.”
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CompleteIT
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Team as a service. We assist companies in the financial sector in developing cutting-edge digital solutions.
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Kosice, Kosice, Sk
Services Provided
40% Mobile App Development (iOS & Android)
35% Blockchain & Web3 Development
15% Legacy System Modernization
10% QA & Software Testing
AI Summary
“CompleteIT delivers team-as-a-service solutions, specializing in supporting financial sector companies with advanced digital development and innovative technology implementation.”
Riff Point LLC
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Riff Point is an all-encompassing software development firm located in Eastern Europe, specifically Ukraine, featuring two divisions dedicated to web and mobile development. Our expertise spans the most popular programming languages and platforms, including PHP, JavaScript, Node.js, Vue.js, as well
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Kharkiv, Kharkiv, Ua
Services Provided+4 Services
8% CMS Development & Customization
10% Backend Development
3% Legacy System Modernization
10% Mobile App Development (iOS & Android)
AI Summary
“Riff Point LLC is a Ukrainian software development firm offering comprehensive web and mobile solutions using diverse languages, frameworks, and CMS platforms for startups and high-profile projects.”
Integral Stack
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We can assist you in creating your next major software product or offer integrated development resources and teams to speed up your product delivery. Our team consists of top-tier software engineers dedicated to delivering high-quality software solutions that align with your budget.
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
San Diego, California, Us
Services Provided+1 Services
50% Software Development Services
25% Custom Web Application Development
10% Blockchain & Web3 Development
10% Mobile App Development (iOS & Android)
AI Summary
“Integral Stack excels in Software Development, delivering custom web and mobile applications, blockchain solutions, and enterprise app modernization. Their expertise aligns with contemporary technology stacks ensuring high-quality software products.”
Cherrypick Agency
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Cherrypick is a prominent IT agency that specializes in providing development solutions for businesses. We prioritize agility, speed, and flexibility, leveraging our expertise and experience to meet the unique requirements of our clients while delivering top-notch service. Our successful track recor
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Blacktown, New South Wales, Au
Services Provided+2 Services
8% API Development & Integration
8% Mobile App Development (iOS & Android)
4% Legacy System Modernization
14% Custom Web Application Development
AI Summary
“Cherrypick is a versatile IT agency specializing in agile, flexible development solutions tailored to diverse business needs, backed by extensive experience and proven success across technologies.”
FOR IN SOLUTIONS d.o.o.
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FOR IN SOLUTIONS is a senior-led software engineering firm located in Osijek, Croatia, catering to clients across Europe and the US. We assist teams that require more than just coding; they need definitive technical guidance, effective architecture, and hands-on execution all within a single engagem
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
Osijek, Osijek Baranja, Hr
Services Provided
25% Custom Web Application Development
15% API Development & Integration
10% Legacy System Modernization
50% AI Agent & Multi-Agent System Development
AI Summary
“FOR IN SOLUTIONS d.o.o. is a Croatia-based senior-led software engineering firm delivering tailored technical guidance, architecture, and implementation across diverse data-intensive and automation projects for European and US clients.”
MadApp Technologies
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We provide contemporary solutions to help expand your business. By integrating advanced technology and enterprise software with agile methods, we ensure quick and dependable service delivery while being budget-friendly.
Highlights
$5,000+
Min Project Size
< $25/hr
Avg Hourly Rate
Sahibzada Ajit Singh Nagar, Punjab, In
Services Provided
25% Mobile App Development (iOS & Android)
15% E-Commerce Development
10% Legacy System Modernization
50% Operational Process Consulting
AI Summary
“MadApp Technologies offers advanced, cost-effective enterprise software solutions using agile methods, ensuring quick and reliable service delivery to support business expansion and growth.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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