Featured List
If you are searching for a reliable IT modernization partner, explore the actual list of the best legacy software companies. The vendors were selected based on their professional focus, expertise, and real business impact delivered by their projects. The list breaks down the basic information about each IT company for a closer glance.
Corsac Technologies .NET Framework, AngularJS (Angular 1.x), Xamarin, ASP.NET Web Forms, Monolithic architecture, JavaScript, jQuery, React Native, VB.NET, SQL Server Reporting Services (SSRS), JavaScript (ES5), Delphi, ColdFusion, COBOL, FoxPro
.NET Core/.NET, Angular, .NET MAUI, Blazor/WebAssembly, Microservices architecture, TypeScript, React/Vue/Angular, Flutter, ASP.NET Core MVC, C# .NET, Power BI/Tableau, JavaScript (ES6+), C#
Undisclosed
50 – 249
2007
United States
Corsac Technologies is a software development company that specializes in breaking tech stagnation and unlocking limitless growth potential. With vast experience across sectors, the company transforms aging platforms into scalable, advanced solutions. Corsac unites legacy software experts with profound tech skills and knowledge of both legacy and advanced systems to transform smoothly, without needless major revamps.
Confirmed success in highly regulated industries guarantees reliable security and compliance. Empowered with AI and emerging tech, they specialize where others generalize to reach meaningful, measurable, and lasting business results.
DXC Technology ASP.NET Web Forms, Monolithic architecture, JavaScript, jQuery, React Native, VB.NET, and many others
–
Undisclosed
10,000+
2017
USA
DXC Technology offers solutions backed by the innovative power of AI. The company operates worldwide, leveraging breakthrough technology to help clients move their businesses forward. As a legacy software company, DXC aims to simplify, optimize, and streamline operations for their clients by introducing advanced methodologies, implementing AI, and administering critical workloads.
Their domain expertise covers aerospace and defense, energy, finance, retail sectors and more. Transparency, security, and trust are the pillars of their cooperation, making them one of the most reliable legacy modernization vendors.
Smartbridge ASP.NET Web Forms, Monolithic architecture, JavaScript, jQuery, React Native, VB.NET, and many others
AWS, Azure, Docker, Python, Java, Node.js, .NET Core, and many others
$150 – $199 / hr
50 – 249
2003
United States
Smartbridge specializes in application modernization to empower business agility and scalability. The range of the company’s services encompasses data and analytics, digital innovation, intelligent automation, and AI implementation.
A trustworthy legacy modernization vendor, Smartbridge carefully assesses the old application and its potential to efficiently transform it into a capable solution. Their team focuses on removing dependence on outdated infrastructure, utilizing cloud services, enriching integrations and analytics, and enabling automations to help their clients reach resilient expansion.
The Smyth Group ASP.NET Web Forms, Monolithic architecture, JavaScript, jQuery, React Native, VB.NET, and many others
AWS, Azure, Docker, Python, Java, Node.js, .NET Core, Microservices, and many others
$150 – $199 / hr
10 – 49
2005
United States
The Smyth Group is one of the leading legacy software modernization companies in the USA. Emphasizing their strategic approach to software transformation, the company closely cooperates with its clients to reveal fundamental issues and strategize impactful solutions.
To ensure custom products that deliver real results, the team has established a proven development approach, from strategizing to scaling, with each step having clear deliverables. This way, The Smyth Group guarantees a transparent process where clients stay updated and track a step-by-step progress.
Devox Software ASP.NET Web Forms, Monolithic architecture, JavaScript, jQuery, React Native, VB.NET, and many others
Angular, .NET, Java, Python, React JS, Vue JS, Node JS, and many others
$50 – $99 / hr
50 – 249
2018
USA, Poland, Ukraine
Devox Software focuses on fixing issues with outdated software and rebuilding ancient products to make them fresh and high-performing. The team aptly addresses security compromises, vendor dependencies, and staggering workflows by implementing AI, Web3, IoT, and more. The team proudly introduces their proprietary tool – AI Solution Accelerator™ that propels quality and reduces development time.
It carries AI-enabled capabilities to remove inefficiencies through extensive automations and AI-empowered workflows. The true value of their services is confirmed by a 95% customer satisfaction rate.
Inoxoft ASP.NET Web Forms, Monolithic architecture, JavaScript, jQuery, React Native, VB.NET, and many others
Flutter, React JS, Python (Django), Golang, Node.js, Ionic, .NET, ASP.NET, React Native
$25 – $49 / hr
50 – 249
2014
USA, Poland, Ukraine
Inoxoft software development company delivers a wide range of IT services. Focusing on small and medium-sized businesses and startups, Inoxoft introduces modern, scalable solutions for innovation and business expansion. The company’s services include certified web and mobile application development, comprehensive product discovery, advanced UI/UX design, Big Data analytics, and more.
They are proficient in the IT solutions for education, real estate, blockchain, healthcare, fintech, and logistics. The Inoxoft’s team takes pride in the ability to address true business challenges and open the opportunities to establish confident market presence.
Leobit WCF, WinForms, VB.NET, Delphi, etc.
.NET Core, Angular, microservices, ASP.NET, C#, Azure, WCF, Entity Framework, Blazor, React, Vue, jQuery, TypeScript, PHP, Python
$25 – $49 / hr
50 – 249
2014
Ukraine, Poland
Leobit is an award-winning IT service provider, delivering an exhaustive range of software development services. The company holds certifications and awards witnessing quality and outstanding results. The team of dedicated professionals adapt the collaboration model right to the client’s needs.
In every project, they act as technology advisors, holding the task holistically, from inception to maintenance and support. The company also has its own design studio that provides comprehensive UI/UX design services including UX consulting, discovery phase, prototyping and testing.
Euvic ASP.NET Web Forms, Monolithic architecture, JavaScript, jQuery, React Native, VB.NET, and many others
AWS, Azure, Docker, Python, Java, Node.js, .NET Core, Microservices, and many others
$50 – $99 / hr
1,000 – 9,999
2005
Poland, Germany, USA, and 4+ countries
Euvic provides software development services globally, with offices in more than 20 locations. The team builds digital solutions from scratch or in required parts, optimises and automates business operations utilizing cloud infrastructure, integrates products into a unified platform, accelerates operations, and implements AI.
With a result-focused approach, they modernize applications into scalable solutions. Euvic also helps their clients with team augmentation, selecting IT specialists for specific projects and handling all hiring procedures.
Accenture ASP.NET Web Forms, Monolithic architecture, JavaScript, jQuery, React Native, VB.NET, and many others
AWS, Azure, Docker, Python, Java, Node.js, .NET Core, Microservices, and many others
Undisclosed
1,000 – 9,999
1998
Hong Kong
The Accenture software development company offers a 360° approach to address the client’s demands. They interpret this method as a unique combination of financial and business value, as well as their commitment to attain an all-encompassing progress for their clients.
Apart from modernization and development services, the team also helps their clients to reskill and upskill their internal staff and achieve sustainability goals. Experienced engineers leverage cloud infrastructure, AI, risk management and technology to deliver meaningful experiences and lasting results.
Innowise ASP.NET Web Forms, Monolithic architecture, JavaScript, jQuery, React Native, VB.NET, and many others
AWS, Microsoft Azure, Google Cloud, Kubernetes, Docker
$50 – $99 / hr
1,000 – 9,999
2007
Poland, Ukraine, Germany, Lithuania
Innowise is one of the leading legacy service management vendors with an extensive team of professionals and broad experience. They offer full-cycle development services, from consulting and strategy to post-launch support. Across industries and sectors, they bring in innovations, removing legacy issues and risks.
They focus on removing old vendor dependencies, extensive maintenance costs, trapped data, and inefficient workflows, infusing agility and scalability into the outdated systems. Through modern, bespoke solutions, Innowise helps their clients jump ahead in the competitive landscape.
ModLogix ASP.NET Web Forms, Monolithic architecture, JavaScript, jQuery, React Native, VB.NET, and many others
Microsoft .NET (C, Visual Basic, FoxPro), Azure, Java, MS Access, SQL Server
$25 – $49 / hr
50 – 249
2014
USA, Ukraine
ModLogics is a full-scale software modernization company with the core focus on transforming ancient systems into advanced, scalable solutions. They have experience and expertise in system audits, legacy upgrades, cloud migration, API integration, software re-engineering and more. In terms of tech stack, the team specializes in .NET Core migration, Visual FoxPro modernization, and Angular migration, with .Net technologies being their primary focus.
The company attains enhanced performance, data integrity, and cost-efficiency with the help of their granular approach that splits the process and ensures progress at every stage.
Euristiq ASP.NET Web Forms, Monolithic architecture, JavaScript, jQuery, React Native, VB.NET, and many others
AWS, Google Cloud, Kubernetes, React, Angular, Vue.js, Python, Golang, Node.js, Java, Kotlin, .Net
$50 – $99 / hr
50 – 249
2016
Canada, Ukraine, Poland
Euristiq crafts tailored strategies to deliver functional and innovative solutions that spur operational efficiency. As a software development company, it transforms applications by leveraging cloud migration, application re-engineering, mainframe modernization, and AI-baked tools. Their team also consults on architecture redesign and software support to guarantee that businesses achieve and retain a long-lasting ability to expand.
The knowledge and experience with AI potential allows Euristiq to remove security risks and reinforce innovation by implementing IoT, AIoT, and data analytics. With intelligent modernization, the company pushes its clients toward a competitive edge.
Code District ASP.NET Web Forms, Monolithic architecture, JavaScript, jQuery, React Native, VB.NET, and many others
Angular, React, Clojure, microservices, Cloud-ready systems, and many others
$25 – $49 / hr
250 – 999
2017
USA, Pakistan, Canada
Code District is another representative of the top legacy systems modernization companies. Staying at the forefront of advanced technology, they leverage AI to craft new digital products and modernize existing ones. With deep expertise across industries and professional understanding of business needs, Code District’s engineers help clients expedite launches, enhance the user experience, reduce manual involvement, and scale effortlessly to accommodate growing demands.
The team prioritizes transparency and open communication on the way to successful, user-oriented digital products.
Onix ASP.NET Web Forms, Monolithic architecture, JavaScript, jQuery, React Native, VB.NET, and many others
Python, Node.js, Java, Ruby, PHP, AWS, Azure, Google Cloud Platform, Heroku, DigitalOcean
$25 – $49 / hr
250 – 999
2000
Ukraine, Poland, Slovakia
Onix is an IT development company that specializes in software rescue missions. Their team quickly and accurately fixes existing troubles, whether it’s a faulty code, missing feature, or a whole staggering project. They provide full-fledged modernization services to ignite the growth of startups, small and medium-sized businesses.
Onix applies a set of well‑established methodologies and profound industry experience to deliver viable products that make businesses thrive. Clients praise their ability to achieve the set goals, while staying within the time and budget limits.
TSRI 35+ Languages
COBOL, PL/1, JCL, CA-IDEAL, Ada, Fortran, and more
Java, C#, .NET Core, C++, and more
Undisclosed
50 – 249
1995
United States
TSRI is an innovative provider of software development services that prepares businesses to adopt advanced technology. They transfer systems from legacy to a future-ready condition by utilizing Composite AI (deterministic AI & generative AI). The team’s expertise together with modern technology allows for minimal risk and business disruption.
Their proven approach practically eliminates errors and risks and drastically cuts the development time. Clients confirm the efficiency of TSRI’s undertakings in migration, refactoring, and modernization of software applications.
Aziro ASP.NET Web Forms, Monolithic architecture, JavaScript, jQuery, React Native, VB.NET, and many others
Migrating apps to modern languages, architectures, and cloud platforms.
Undisclosed
1,300+
2007
India, United States
Aziro ranks among notable legacy software companies, helping enterprises transition from outdated systems to flexible, modern platforms. Their modernization solutions cut down costs, enhance durability, and ready essential IT frameworks for emerging requirements.
Aziro specializes in integration, SaaS frameworks, and refreshed technology stacks, allowing companies to swiftly transition from conventional architectures to scalable, feature-rich systems.
Sombra ASP.NET Web Forms, Monolithic architecture, JavaScript, jQuery, React Native, VB.NET, and many others
.NET Core/.NET, Angular, Microservices architecture, TypeScript, React/Vue/Angular, Flutter, ASP.NET Core MVC, C# .NET, JavaScript (ES6+), C#
$50 – $99 / hr
250 – 999
2013
Ukraine, Colombia
Sombra specializes in legacy software modernization, assisting organizations through cloud engineering, AI/ML, data infrastructure, and secure software deployment. Their teams examine issues, determine root causes, and divide tasks into achievable steps, guaranteeing projects remain timely and within scope.
Sombra, as a legacy software modernization expert, enables companies to concentrate on business goals while providing reliable technology solutions.
Transparity ASP.NET Web Forms, Monolithic architecture, JavaScript, jQuery, React Native, VB.NET, and many others
AWS, Azure, Docker, Python, Java, Node.js, .NET Core, Microservices, and many others
$100 – $149 / hr
250 – 999
2015
England
Transparity is recognized among trusted legacy modernization vendors, guiding organizations through digital transformation and the shift away from outdated systems. Transparity has a deep Microsoft expertise, including all six Partner Designations and Azure Expert MSP status.
They design and deliver solutions that streamline operations, strengthen collaboration, and modernize infrastructure. Their technical approach brings clarity, structure, and long-term value to modernization efforts.
Insighture ASP.NET Web Forms, Monolithic architecture, JavaScript, jQuery, React Native, VB.NET, and many others
AWS, Azure, Docker, Python, Java, Node.js, .NET Core, Microservices, and many others
$25 – $49 / hr
50 – 249
2016
Australia, Sri Lanka
Insighture positions itself as the best software legacy service provider, helping organizations move beyond system constraints and adopt modern, efficient architectures. Their team explores each client’s context to drive meaningful outcomes, whether modernizing applications, launching new digital concepts, or scaling operations with reduced costs.
Insighture also supports ongoing maintenance and builds capable support teams for even the most complex environments.
Simform NET Framework, ASP.NET Web Forms, Monolithic architecture, JavaScript, jQuery, React Native, VB.NET, Delphi, ColdFusion, COBOL, FoxPro
Python, Node.js, Java, Ruby, PHP, AWS, Azure, Google Cloud Platform, and more
$25 – $49 / hr
1,000 – 9,999
2010
United States, India, Canada, and the United Arab Emirates
Simform is among the respected legacy service management vendors, modernizing enterprise systems through cloud migration, re-platforming, and architectural upgrades. They ensure minimal disruption while improving performance and user experience.
With expertise across fintech, healthcare, logistics, retail, and high-tech sectors, Simform aligns aging applications with current engineering practices and delivers scalable, future-ready digital solutions
Sparq NET Framework, ASP.NET Web Forms, Monolithic architecture, JavaScript, jQuery, React Native, VB.NET, Delphi, ColdFusion, COBOL, FoxPro
Python, Node.js, Java, Ruby, PHP, AWS, Azure, Google Cloud Platform, Heroku, DigitalOcean
$50 – $99 / hr
1,000 – 9,999
2009
United States, Uruguay
Sparq as a legacy software expert, delivers modernization programs centered on data engineering, AI deployment, and modular technology architectures. Their unified approach spans strategy, design, engineering, and transformation, avoiding fragmented execution.
Sparq helps organizations resolve system complexity, accelerate digital delivery, and operationalize machine learning with measurable outcomes and durable implementation practices.
Check cloud specialization and certifications, as well as domain expertise. You are looking for legacy software companies that
Your partner must deliver non-compromised security and regulatory compliance to eliminate risks and penalties. Check if they:
Evaluate potential partners based on their respect to your business continuity. You should expect the following:
Think of your migration project strategically, assessing the future impact and opportunities. In this sense, your partner should provide:
Reliable legacy software expert firms guarantee transparency and cost-efficiency. Favor vendors who offer the following:
Committed providers ensure that the delivered product works up to the expectations and help maintain its seamless operation. Consider, whether your partner
Legacy Software Modernization