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

SYZYGY Enterprise Solutions
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SYZYGY Enterprise Solutions, established in 2015 by a skilled young professional dedicated to offering smarter solutions for businesses and clients, has evolved into a global provider of comprehensive mobile and web solutions. The founder brings extensive experience from the days of Symbian and Blac
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
50-249
Employees
Coimbatore, Tamil Nadu, In
Services Provided
25% Custom Web Application Development
50% Mobile App Development (iOS & Android)
15% E-Commerce Development
10% Legacy System Modernization
AI Summary
“SYZYGY Enterprise Solutions, founded in 2015, delivers advanced mobile and web applications across platforms, specializing in IoT, enterprise IT, and tailored solutions for diverse sectors globally.”
SYTOSS
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SYTOSS is a global software development firm focused on assisting businesses of all sizes in creating custom software that is both high-quality and cost-effective. With over 150 professionals on our team—including software engineers, business analysts, QA engineers, DevOps specialists, and IT expert
Highlights
$50,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Bratislava, Bratislava, Sk
Services Provided+9 Services
7% ERP & CRM Development
8% API Development & Integration
14% Legacy System Modernization
5% Custom Web Application Development
AI Summary
“SYTOSS is a global software development firm specializing in custom, high-quality solutions across industries, excelling in large-scale projects, legacy system modernization, and advanced technologies like AI.”
HashTag Labs Private Limited
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At #Labs, we create modern solutions by developing strategies and implementing best practices, ensuring that your business remains innovative in an ever-changing market. Our expertise derives from our seasoned professionals, who possess excellent programming abilities and a track record of deliverin
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Lucknow, Uttar Pradesh, In
Services Provided
50% Custom Web Application Development
25% Mobile App Development (iOS & Android)
15% E-Commerce Development
10% Legacy System Modernization
AI Summary
“HashTag Labs Private Limited delivers innovative, strategy-driven solutions with skilled professionals, ensuring timely delivery of complex projects that keep businesses competitive in evolving markets.”
ST6
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We are convinced that thoughtfully designed software can have a significant beneficial effect. We imagine a future where organizations can tackle critical challenges using innovative software solutions. ST6 enables individuals and organizations to progress through software that is created with the h
Highlights
$25,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Sofia, Sofia, Bg
Services Provided
45% Custom Web Application Development
35% Mobile App Development (iOS & Android)
10% Blockchain & Web3 Development
10% Legacy System Modernization
AI Summary
“ST6 develops high-quality, thoughtfully designed software solutions that empower individuals and organizations to address critical challenges and drive meaningful progress across diverse sectors.”
To Increase Partners
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We leverage our expertise in agile methodologies, design thinking, and lean practices to achieve outcome-focused results drawn from our experiences with diverse industries and clients. We are equipped to offer our clients the advantages of our insights, reliability, and proven results for their most
Highlights
$25,000+
Min Project Size
$150+/hr
Avg Hourly Rate
2-9
Employees
Plano, Texas, Us
Services Provided+4 Services
30% Business Consulting Services
10% Cloud Consulting & SI
10% Digital Strategy
10% ERP Consulting and SI
AI Summary
“To Increase Partners applies agile, design thinking, and lean methods across industries, delivering reliable, outcome-focused solutions backed by extensive experience and proven expertise.”
Proventeq
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Proventeq focuses on modernizing document management and automating processes with AI, assisting organizations in lowering storage expenses, enhancing Microsoft 365 governance, and increasing the productivity of knowledge workers. By transitioning and integrating ECM/DMS systems to contemporary plat
Highlights
50-249
Employees
Reading, Berkshire, Gb
Services Provided+4 Services
25% ECM Consulting and SI
20% AI Agent & Multi-Agent System Development
15% AI Strategy & Roadmap Consulting
10% Machine Learning Model Development
AI Summary
“Proventeq modernizes document management by integrating AI and Microsoft 365, enhancing governance and collaboration for diverse sectors globally through its Content Productivity Suite and expert consultancy.”
EleraSoft
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Our company was founded to deliver cutting-edge software solutions, leveraging 30 years of expertise in software and technology. Our skilled team creates advanced applications for Windows, Web, and Mobile platforms, diligently adhering to the latest technological developments to address the unique r
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
20% API Development & Integration
50% Custom Web Application Development
15% Legacy System Modernization
15% QA & Software Testing
AI Summary
“EleraSoft specializes in advanced software solutions across Windows, Web, and Mobile platforms, offering diverse products including museum, document, HR, and event management systems.”
Turcode Software
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A company that creates business software applications.
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Bursa, Tr
Services Provided
50% Custom Web Application Development
20% Mobile App Development (iOS & Android)
15% E-Commerce Development
15% Legacy System Modernization
AI Summary
“Turcode Software develops versatile business software applications designed to optimize organizational processes and enhance operational efficiency across various industries.”
Phunware, Inc.
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In early 2009, large enterprises were beginning their digital transformation journey. Computing was shifting to the cloud, application usage was moving to mobile devices, and software and data were evolving into Software-as-a-Service (SaaS) and Data-as-a-Service (DaaS) models. On February 23, Alan K
Highlights
$10,000+
Min Project Size
50-249
Employees
Austin, Texas, Us
Services Provided+1 Services
40% Software Development Services
20% Mobile App Development (iOS & Android)
15% Other IT Consulting and SI
15% QA & Software Testing
AI Summary
“Phunware develops a mobile software platform enabling enterprises to engage, manage, and monetize customer experiences, enhancing brand interaction and business performance across app lifecycles.”
Vog App Developers
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We create tailored software and applications for iOS, Android, and the Web—all developed right here in Canada. Founded in 2012, Vog aims to be a local partner for expanding businesses, assisting them in developing high-quality mobile applications to elevate their success. Over the past ten years, o
Highlights
$25,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
50-249
Employees
Calgary, Alberta, Ca
Services Provided+1 Services
40% Mobile App Development (iOS & Android)
25% Custom Web Application Development
15% Backend Development
15% Frontend Development
AI Summary
“Vog App Developers is a Canadian firm specializing in custom software, mobile, web, and firmware development with in-house design, engineering, and support teams serving diverse industries since 2012.”

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Top Legacy System Modernization Firms

List of the Best Legacy System Modernization Agencies

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