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.

How this list is built

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

IT DEV GROUP
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Our primary goal is to provide a high-quality product for automating your business processes. We help turn your concept from an initial idea into a fully functional product, giving you a ready-to-use business tool. As a web development company, we facilitate the rapid creation of stable products bac
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+6 Services
15% Custom Web Application Development
10% Mobile App Development (iOS & Android)
10% Backend Development
8% Frontend Development
AI Summary
“IT DEV GROUP specializes in developing high-quality web and mobile business automation tools, leveraging modern technologies, in-house design, and a focused tech stack for diverse client solutions.”
i-Source Infosystems
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
i-Source addresses business challenges by reshaping enterprise technology to enhance operational flexibility, strengthen business resilience, improve efficiency, and lower costs throughout the entire enterprise ecosystem.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
250-999
Employees
Pune, Maharashtra, In
Services Provided+5 Services
20% Custom Web Application Development
5% Legacy System Modernization
6% Cloud Consulting & SI
6% AI Strategy & Roadmap Consulting
AI Summary
“i-Source Infosystems transforms enterprise technology to boost operational flexibility, business resilience, and efficiency, while reducing costs across the entire organizational ecosystem.”
Hostrings
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Web Designer: The leading website design and development firm provides exclusive website design, web development, and SEO services in Karachi, Pakistan.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Karachi, Sindh, Pk
Services Provided+11 Services
3% Mobile App Development (iOS & Android)
8% E-Commerce Development
5% Legacy System Modernization
5% Mobile App UI Design
AI Summary
“Hostrings is a multidisciplinary digital solutions firm in Karachi offering mobile app development, UX/UI design, branding, digital marketing, IT services, and business consulting for retail clients.”
Reinier Martin UX Design Studio
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Reinier Martin is a design studio focused on user experience, dedicated to developing accessible websites and applications. With more than 25 years of expertise, we create intuitive digital solutions. Our approach emphasizes user-centered design, encompassing everything from research to no-code deve
Highlights
$10,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Utrecht, Utrecht, Nl
Services Provided+4 Services
8% Custom Web Application Development
5% E-Commerce Development
3% Legacy System Modernization
17% Frontend Development
AI Summary
“Reinier Martin UX Design Studio leverages 25+ years of expertise to create accessible, user-centered digital solutions, delivering intuitive websites and applications through comprehensive UX design and no-code development.”
Commit Labs LLC
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
We build strong engineering teams composed of the top 1% of IT talent to deliver comprehensive technology solutions for SMEs, enterprises, funded startups, and ventures. Our development team brings years of experience in Ruby on Rails, Angular, React, Swift, ObjectiveC, and Java (Android).
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided+2 Services
18% Custom Web Application Development
18% Mobile App Development (iOS & Android)
7% Legacy System Modernization
7% IT Staff Augmentation
AI Summary
“Commit Labs LLC builds elite engineering teams delivering comprehensive software development and IT staff augmentation services, supporting diverse clients with expertise in modern technologies and AI-driven solutions.”
Onelogica
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Onelogica is an innovative, cloud-based company committed to fostering digital transformation across various sectors. With a focus on Smart Applications, Data Analytics, Big Data, Machine Learning, and Artificial Intelligence, we are at the leading edge of technology. Our team creates and develops s
Highlights
$10,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Services Provided+11 Services
3% Custom AI Chatbot Development
5% LLM Integration & Prompt Engineering
8% Generative AI
2% Other IT Consulting and SI
AI Summary
“Onelogica develops innovative, cloud-based smart applications leveraging AI, machine learning, and big data to enable digital transformation and customized solutions across diverse industries.”
Bugni Labs
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Bugni Labs is a software engineering firm that leverages AI to create scalable and high-performing systems tailored to intricate business requirements. Their expertise lies in custom software development, system architecture, and AI-powered solutions that enable organizations to transform complexity
Highlights
10-49
Employees
Services Provided+6 Services
10% API Development & Integration
18% Custom Web Application Development
5% Legacy System Modernization
3% Other IT Consulting and SI
AI Summary
“Bugni Labs specializes in AI-driven custom software development and system architecture, delivering scalable, high-performance digital solutions tailored to complex business needs and long-term growth.”
Lullabot
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Lullabot is a company that specializes in strategy, design, and Drupal development, known for building many prominent and award-winning websites for major publishers. Being one of the pioneering Drupal agencies, Lullabot has gained a strong reputation for its impressive portfolio, genuine methodolog
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Services Provided+3 Services
10% Custom Web Application Development
12% Backend Development
8% Frontend Development
3% Legacy System Modernization
AI Summary
“Lullabot is a leading Drupal agency specializing in strategy, design, and development, with a strong portfolio of award-winning websites for major publishers and global organizations.”
MouseOver
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
We are a group of technology experts with ten years of experience at large IT firms serving Fortune 500 clients. Now, as MouseOver, we operate with remarkable agility and flexibility, prepared to deliver high-quality services for your business. Our offerings include cloud architecture, big data, Dev
Highlights
$25,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Lviv, Lviv, Ua
Services Provided+8 Services
4% Mobile App Development (iOS & Android)
3% Legacy System Modernization
8% API Development & Integration
3% Progressive Web App (PWA) Development
AI Summary
“MouseOver is a technology firm leveraging a decade of Fortune 500 experience to provide agile, high-quality services including cloud architecture, big data, DevOps, and full-cycle development.”
palmiq
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Palmiq offers comprehensive turnkey solutions for government agencies and businesses of all sizes, specializing in technology consulting and mobile/web application development. Our team of seasoned IT professionals possesses extensive experience in innovative, forward-thinking, and efficient technol
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Sterling, Virginia, Us
Services Provided+6 Services
10% Mobile App Development (iOS & Android)
8% Custom Web Application Development
2% Legacy System Modernization
12% Product UX Strategy
AI Summary
“Palmiq delivers turnkey technology consulting and mobile/web app development services, enabling businesses and government agencies to enhance infrastructure, efficiency, and digital transformation outcomes.”

...

...

...

Latest insights & expert perspectives

Explore data-backed surveys with inputs from top industry experts.

Stated minimum project sizes among the firms listed under software development services on Edverise, with the $50,000 band shaded

Vendor Selection

Questions to Ask a Software Development Agency: Six With Proof

A vetting script for second-round agency calls: six questions, the document each answer has to produce, and what a directory listing or a badge really proves.

Nihar Ranjan Rout

10/31/2026

Three software development quotes of $38,000, $94,000 and $210,000 converted to effective hourly rates of $79, $73 and $87.50

Vendor Selection

How to Compare Software Development Quotes Priced 5x Apart

Three bids for the same build are rarely comparable as written. A normalization checklist, a weighted grid adapted from FAR Part 15.3, and the hourly arithmetic.

Akash Mohapatra

10/31/2026

Chart of minimum project size stated by firms listed under AI agent development on Edverise, with the $50,000 band highlighted

Vendor Selection

AI Agent Development Cost: Build, Tokens, Reliability

An AI agent has three costs. Compute the monthly token bill from published list prices, then set the build quote against what listed firms actually charge.

Santanu Prasad Sahoo

10/31/2026

Check All Our Blogs

One Platform. One Promise. One Trust.

Edverise is building the trusted way to find tech vendors. List your company early, or talk to us about backing the platform.

Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

Where buyers look next

Latest insights & expert perspectives

Questions to Ask a Software Development Agency: Six With Proof

How to Compare Software Development Quotes Priced 5x Apart

AI Agent Development Cost: Build, Tokens, Reliability

One Platform. One Promise. One Trust.