Top 10 App Modernization Development Companies in 2025

Why look for the best app modernization company?Imagine being able to support 70% more users. No extra resources. No dip in performance. That's what legacy application modernization helped a Pharma company achieve. Their Saas app - once modernized - could handle more users and saw a 65% increase in data processing speed. But not every app modernization project turns out that way. In fact, 79% of app modernization projects fail. Want to be among the successful ones? Check out what are the top app modernization companies in 2025 below and get started.

When you search "Top App Modernization Development Companies" you get thousands of results. Every company says they do it. And every company says they do it right. So, who offers the best legacy app modernization services?

The biggest one? The one offering the lowest cost? The one that has an office closest to yours?

You can use these parameters. But will these help you find the most suitable app modernization company? NO.

Why?

Because often the best app modernization service providers (for your specific needs!) aren't the largest, cheapest, or closest to you. We've been offering legacy application modernization services for decades. We've served hundreds of clients. And along the way, we have learned 2 most important lessons:

• Not every company can deliver every project
• You don't need the best app modernization service providers. You need the most suitable one.

That's why we are sharing a list of the top 10 companies offering enterprise app modernization solutions.

Dive right in.

How We Found The 10 Best App Modernization Companies

87% of business leaders said that app modernization is essential for business growth and success. App modernization statistics like this prove that now is the time to move away from your legacy app.

Radixweb has been active in the IT domain for over 25 years now. This experience gives us:

• A deep understanding about the needs of application modernization projects
• An insider view of the app modernization landscape
• Practical understanding of what makes an app modernization company 'good'

Our team combined this experience with in-depth research and analysis to identify the top 10 players in the market. Every company on the list:

• Has at least 5 years of experience in the modernization of legacy applications
• Has more than 100 technical experts onboard
• Is compliant with at least 2 security metrics like ISO 27001, SOC2, or GDPR
• Is a recognized name in the digital and tech domain

Note: Yes, we have mentioned Radixweb on the list. Not for self-promotion, but because we meet the qualifying criteria that we have set. We'll let the details talk more and let you be the best judge of our capabilities.

Also Read: A CIO’s Guide to Modernizing Monolithic Applications

Top App Modernization Development Companies

Below is a list of 10 leading application modernization firms. All the options on this list are trusted enterprise app modernization partners. You can choose the one that best suits your unique needs.

1. Accenture

Accenture is a global powerhouse in digital transformation, known as the top app modernization agencies for enterprises. They offer deep expertise in mainframe migration, cloud integration, and enterprise IT solutions.

Choose Accenture if you're seeking large-scale modernization with enterprise-grade processes, backed by global reach and consulting depth.

2. Radixweb

Radixweb is a full-spectrum technology partner, trusted by global enterprises for app modernization, custom software, and domain-driven digital transformation. With a future-first mindset, we blend deep technical skill with a sharp business lens to drive real impact.

That’s not all. We also offer app modernization consulting services. During the consultancy session, we understand not just the technical details, but your business goals too. This helps us deliver cost-effective app modernization solutions that drive tangible results.

Choose Radixweb if you are looking for enterprise app modernization solutions. As a balanced modernization partner, we bring strong engineering depth, domain insight, and a proven record of delivering secure, scalable, and future-ready applications.

Project Spotlight:

One of our clients came to us when they were losing market share because they weren’t on the cloud. Given their need to capture the market share back, we helped them migrate to the cloud and also modernized their basic application to ensure digital readiness.

Here’s what the client had to say about the outcomes of the project:

Read the complete app modernization success story here.

3. Deloitte

Deloitte delivers modernization solutions as part of its holistic digital transformation practice, combining strategy, cloud migration, and security expertise. With dedicated modernization centers and a client base across regulated industries, they bring both scale and insight.

Choose Deloitte for modernization strategies that go beyond code—aligning IT transformation with business, compliance, and future growth.

4. PwC

PwC is one of the “Big Four” professional services firms, offering technology consulting, cloud transformation, and legacy modernization services. They work with a business-aligned, compliance-first approach.

Choose PwC if you want business-aligned modernization backed by deep regulatory, risk, and strategy expertise.

5. CDW

CDW is a leading multi-brand technology solutions provider offering IT modernization services for enterprise and public sector clients. Their strong infrastructure expertise makes them ideal for scalable modernization.

Choose CDW if you need a modernization partner with strong infrastructure capabilities.

6. Euvic, Inc.

Euvic, Inc. is a global leader in legacy application modernization, with a large talent pool of highly skilled Polish software engineers. They specialize in end-to-end modernization, cloud migration, and risk-minimized transformations.

Choose Euvic, Inc. if you need deep expertise in legacy systems, risk-minimized transformation, and access to a large, highly skilled talent pool.

7. Mphasis

Mphasis is a digital solutions provider with strong capabilities in legacy modernization, cloud-native application development, and AI-powered transformation. They combine agile delivery with domain depth.

Choose Mphasis if you need AI-infused modernization with proven delivery models.

8. Hexaware Technologies

Hexaware specializes in application modernization, cloud enablement, and intelligent automation. They help enterprises modernize at speed while reducing tech debt.

Choose Hexaware if you're looking for fast, cost-efficient modernization.

9. CSHARK

CSHARK revitalizes outdated systems with a focus on minimizing disruption and maximizing business value. They offer tailored solutions for cloud migration and code refactoring, serving clients in the US, Europe, and APAC.

Choose CSHARK if you want a partner that minimizes disruption while delivering innovative solutions.

10. Trigent Software

Trigent Software delivers robust application modernization solutions, helping enterprises transition from legacy systems to scalable, cloud-native architectures. Their expertise spans custom software development, cloud migration, and seamless integration with modern technologies.

Choose Trigent Software if you want a proven, reliable partner with deep expertise in custom solutions.

Factors to Consider When Selecting the Right App Modernization Company

If you are still not sure which app modernization company is the right option for your needs, below we have mentioned 5 critical factors that will tell you how to choose an app modernization company in 2025.

Specialized Modernization Experience

Choose a company with a strong track record in legacy system upgrades (not just general software development!) to minimize risk and downtime.

Also Read: Application Modernization Methods to Choose From

Industry Knowledge

Select a partner that understands your industry’s specific needs, whether it's compliance, performance, or something else.

Cloud & DevOps

Skills Ensure they have hands-on expertise in:

• Multi/hybrid cloud setups
• CI/CD pipelines
• Infrastructure as Code (IaC)
• Containerization and observability
• Generative AI for modernization

Security and Compliance

The company should keep security as a prime focus during app modernization, address vulnerabilities during the upgrade to prevent breaches and ensure regulatory compliance.

Scalability and Ongoing Support

Look for flexible engagement models, long-term maintenance, and the ability to scale your app as your needs evolve.

Selecting the right app modernization company is a decision that echoes far beyond deployment. Choose a partner who brings technical depth, business context, and a clear plan for growth. That’s how you can ensure high ROI with application modernization.

Don’t Just Modernize - Future-ProofApp modernization isn’t just about upgrading tech. It’s about reshaping how your business performs, scales, and competes in a digital-first world. Whether you're rehosting to control costs or rearchitecting for cloud-native innovation, the goal isn’t just transformation. Sustained relevance is why enterprises need to focus on app modernization.As a dependable app modernization partner, we won't just rewrite your code. They’ll reframe your systems to align with your business goals, user needs, and market demands. That’s the kind of impact that lasts beyond today’s features and frameworks.So before you choose a vendor, choose a vision. Modernize not just for performance, but for resilience, agility, and growth. Schedule a no-cost strategy session with our experts today!