Featured List
Mainframe modernization isn’t just a tech choice; it’s a partner choice. If rising maintenance costs, talent shortages, security pressure, and cloud integration issues are slowing you down, this directory helps. We reviewed the market and listed the TOP 11 mainframe modernization companies to watch, so you can compare partners, reduce risk, and modernize with confidence.
Corsac Technologies Hybrid cloud (AWS/Azure/GCP), DevOps/DevSecOps, CI/CD pipelines, app & data modernization, security/compliance practices, rehosting/replatforming/refactoring patterns, mainframe integration patterns
Undisclosed
50 – 249
2007
United States
If your mainframe software feels stable but holds you back, Corsac Technologies brings a practical modernization path. Corsac Technologies helps you modernize mainframe software without breaking what already works. Their experts focus on improving performance, security, and delivery practices with DevOps/DevSecOps and hybrid cloud integration. They help you evolve on-prem and cloud environments together. If you’re tired of rising maintenance costs and slow releases, their outsourcing approach targets root causes, not just code symptoms, so you can modernize with less risk.
IBM IBM Z / z/OS, Red Hat OpenShift, IBM Wazi (VS Code/Dev Spaces), Ansible, IBM Z & Cloud Modernization Stack, watsonx Code Assistant for Z, hybrid cloud integration
Undisclosed
300,000+
1991
170+ countries
If you’re stuck with aging mainframe software that’s hard to extend, IBM helps you modernize around real business constraints: uptime, security, and change risk. Their experts support rehosting, refactoring, API enablement, and hybrid integration, helping you connect the mainframe to cloud apps and digital platforms. IBM Consulting works well when you need scale and governance. If you are looking for a mainframe vendor with broad consulting, software, and infrastructure capabilities, they can help you reduce technical debt and build a roadmap that fits enterprise complexity.
Accenture Hybrid cloud (AWS/Azure), API integration, DevOps/CI/CD, modernization factory tooling, rehosting/replatforming/refactoring patterns, portfolio rationalization, read-offloading approaches
Undisclosed
1,000 – 9,999
1998
Hong Kong
Accenture helps enterprises modernize mainframe software without forcing a “big rewrite.” They work at your pace, offload workloads, and improve efficiency with modernization practices and cloud adoption. Accenture helps you navigate timelines, risk, and organizational complexity without guessing. Their experts use portfolio analysis, DevOps practices, APIs, and cloud strategies to reduce bottlenecks and improve speed. If you’re considering outsourcing, they bring strong consulting depth and broad delivery capacity.
Kyndryl Kyndryl Bridge (AIOps), IBM Z integration, AWS/Azure hybrid delivery, AI & GenAI modernization support, workload optimization, automation for ops + migration pathways
Undisclosed
80,000
2021
66 countries
Kyndryl helps you modernize legacy systems with mainframe product engineering services built for a hybrid IT reality. Their experts combine deep mainframe experience with automation, AIOps, and generative AI to improve visibility and operational control through Kyndryl Bridge. If you’re balancing risk, security, and cloud speed, they offer migration paths from rehosting to full off-mainframe moves. With partnerships across hyperscalers like Microsoft and Google Cloud, they help you modernize without losing governance or uptime.
Luxoft COBOL, Assembler, IMS, JCL, CA Gen, tool-assisted modernization (compilers/code converters), CI/CD enablement, automated testing, mainframe-to-cloud/off-mainframe migration
$50 – $99/hr
12,900 employees
2000
29 countries
Luxoft helps you modernize mainframe systems while keeping the business logic you can’t afford to lose. Their experts work with COBOL, Assembler, IMS, and JCL, and support modernization with strong test coverage, CI practices, and tooling like compilers and code converters. If cost pressure and skills gaps worry you, their approach aims to reduce risk while making change safer and more repeatable. Their experts combine open-source technologies, automation, and continuous integration to modernize on the mainframe or move workloads off it.
CGI CGI M8 automated modernization environment, Unix/Linux migration targets, tool-assisted refactoring/replatforming, portfolio migration frameworks, risk-controlled transformation execution
Undisclosed
94,000 employees
1976
Montreal, Quebec, Canada
CGI helps you move from expensive, constrained legacy platforms to more flexible Unix and Linux environments through Mainframe modernization. Their experts focus on preserving your core business processes while lowering maintenance burden, often aiming for major cost reductions and freeing teams to work on innovation. Their Global Competency Center and M8 automated tooling support safer migration with less operational risk.
HCL Tech Hybrid mainframe + cloud modernization, AI-driven code analysis, proprietary accelerators, rehost/replatform/refactor frameworks, IBM Z ecosystem alignment, modernization advisory + managed ops
Undisclosed
12,900 employees
2000
India
HCLTech is considered among the VMS companies that can support modernization at an enterprise scale. Their experts help you modernize mainframe applications while protecting existing investments, using an incremental “business capability first” approach. They cover rehosting, replatforming, refactoring, and hybrid cloud integration, with proprietary accelerators and AI-driven code analysis to reduce manual effort and keep functional parity with minimal disruption.
Rocket Software Mainframe automation tooling, hybrid IT management (mainframe + distributed + cloud), integration/middleware patterns, performance + security modernization layers, application replatforming support
Undisclosed
3,000+ employees
1990
United States
Rocket Software helps you modernize mainframe environments without turning them into a fragile science experiment. Their experts focus on automation and hybrid IT, spanning mainframe, distributed, and cloud. So you can improve performance, security, and agility as well as reduce operational overhead and modernize with more confidence and less disruption risk. Their recognition as a Challenger in the 2025 Gartner Magic Quadrant is a signal that they deliver innovation with operational discipline.
Kumaran NxTran tool-assisted migration, mainframe-to-Java modernization, rehost/refactor/re-engineer to microservices, process accelerators & modernization frameworks, enterprise transformation delivery
Undisclosed
900 employees
1990
India
Kumaran helps you tackle the real problems behind mainframe modernization. Their experts use structured frameworks, process accelerators, and tool-driven migration methods to reduce risk and improve cost efficiency. Kumaran brings 30+ years of modernization experience and can help you rehost, refactor for the cloud, or re-engineer into microservices. With tool-assisted accelerators like NxTran, they focus on faster time to market and a smoother path to Java modernization when you need predictable delivery.
Wipro AI-driven code analysis, automation accelerators, rehost/replatform/refactor + hybrid integration, DevOps + CI/CD enablement, governance frameworks for regulated modernization programs
Undisclosed
10,000 + employees
1945
India
If modernization feels risky because of cost, complexity, and compliance, Wipro brings structure and predictability. Their experts use automated analysis, proven frameworks, and delivery accelerators to lower costs and speed up transformation across industries like banking, telecom, and retail. They also help you embed CI/CD practices, so the result isn’t just “modernized,” but easier to evolve and operate long-term.
Astadia Astadia FastTrack methodology, automation suite (high conversion automation), GenAI support, automated testing, cloud-ready replatform/refactor routes, partner ecosystem (incl. AWS)
Undisclosed
350 employees
2002
United States
Astadia combines deep modernization expertise with the scale of Amdocs, which matters when you’re modernizing large portfolios under real enterprise constraints. Their experts help you shorten project duration, reduce cost and operational risk, and improve performance, whether you stay on the mainframe or move off it. They also work with major cloud and technology partners, so you get the “right fit” approach instead of a single preset path.
Top mainframe modernization companies should prove hands-on work with COBOL, PL/I, IMS, and DB2, and show migrations to Java, .NET, Kubernetes, and cloud-native stacks. The best teams combine cloud, containers, and modern frameworks with sector-specific compliance and operations knowledge. This is how you find the best technology to switch from mainframe for your system.
Strong vendors showcase case studies in your industry or company size, plus references and independent reviews. Check if they delivered on time, handled setbacks well, and stayed transparent. Past performance prevents costly surprises.
Cloud partnerships reduce friction. Mainframe vendors with AWS and Microsoft Azure certifications get better tooling, training, and support channels. For you, it means smoother migrations, fewer roadblocks, and architectures optimized for real hybrid and cloud-first enterprise needs.
Security must be built in from day one. Choose teams with DevSecOps practices, continuous monitoring, and experience with GDPR, HIPAA, or PCI DSS. You protect sensitive data and avoid turning modernization into a new compliance and risk problem.
Modernize for growth, not a temporary patch. The right partner designs systems that scale with users, integrations, AI adoption, and multi-cloud needs. They also pick technologies with strong vendor support, so you don’t modernize into another dead end.
Even strong engineers fail without clear communication. Look for transparent reporting, accessible PMs, and collaboration via Jira, Azure DevOps, or Slack. The best vendors flag risks early, align expectations, and keep you involved without overloading your team.
The obsolete hardware systems are still used as a backbone for many business, especially in conservative industries like healthcare, government, or finances. Such outdated computers are called mainframes. They are proven to be reliable and stable, however, their ongoing maintenance is difficult, expensive, and risky in the long-term perspective. Mainframe modernization is not optional. It’s essential if you want to ensure business continuity and security. Thanks to modernization tailored to your specific workflow and strategic goals, you’ll unlock your growth potential and enable seamless integration with modern tools and platforms.
There are several popular approaches applied by mainframe modernization companies. Among them are rehosting, replatforming, refactoring, rebuilding, or combination of them. We highly recommend to define your business goals first. Based on the outlined business needs, your tech partner will be able to suggest the most optimal solution. The approaches differs by the transformation depth, implementation speed, required resources, risks, and sustainability of the outcomes.
Absolutely. Moreover, incremental modernization is the best possible approach due to its minimized risks and cost efficiency. First, your mainframe modernization company should evaluate the existing system, its weaknesses, and enhancement potential. Then the experts set the modernization priorities and build a detailed roadmap with clear milestones. By running the old and new environments in parallel, your workflow is safeguarded from disruption, while all the updates can be thoroughly tested.
Sometimes it seems like it’s enough to hire a company with a strong modern tech stack. However, when it comes to mainframes, it’s important to have an in-depth understanding of legacy technologies like COBOL, JCL, DB2, etc. Check their portfolio: there should be at least 5 successful modernization case studies. Book an introductory call. A seasoned modernization company will pay special attention to your business goals and show willingness to tailor the strategy according to your specific needs.
Not all of them, however, some of the top-rated mainframe modernization companies usually provide post-launch support to ensure smooth performance, system stability, fast response to unexpected errors, and resource optimization. Also, such support may include training for your internal team and sharing of valuable insights for confident and independent work with the system. You’ll also get all the system documentation in a well-structured and clear format.
Legacy Software Modernization