Modern businesses rely on fast, scalable, and cloud-ready applications to stay competitive—but many are still stuck with legacy systems that slow them down. That’s where application modernization comes in.
In 2025, companies are increasingly turning to application modernization services to replatform, refactor, or rearchitect their legacy systems. Whether you're migrating to the cloud, updating monolithic applications, or streamlining operations, the right partner can help reduce tech debt and unlock long-term agility.
To help you find the best fit, we’ve rounded up the 10 best application modernization companies in 2025. These firms stand out for their technical expertise, proven success across industries, and ability to deliver tailored modernization strategies. First up: SingleStone Consulting.
What Is Application Modernization?
Application modernization is the process of updating legacy software systems to align with current business needs, modern infrastructure, and evolving technologies. It typically involves migrating apps to the cloud, improving codebases, and enabling better scalability, performance, and integration.
In 2025, modernization isn’t just a tech upgrade—it’s a business imperative. Modernized applications help organizations:
- Reduce operational costs and downtime
- Improve speed, security, and reliability
- Support new digital experiences and integrations
- Align better with cloud-native and DevOps practices
Common modernization strategies include:
- Rehosting (lift-and-shift)
- Refactoring (modifying code to improve performance)
- Rearchitecting (rebuilding applications with modern frameworks or microservices)
Choosing the right approach—and the right consulting partner—can make the difference between incremental improvements and transformational results.
The Ten Best Application Modernization Companies in 2025
1. SingleStone Consulting
Overview
SingleStone Consulting is a digital transformation firm that specializes in helping enterprises modernize their legacy applications and data systems. With a human-centered approach and deep technical expertise, SingleStone delivers scalable, cloud-ready solutions that meet today’s business demands.
Core Services
- Legacy application assessment and replatforming
- Cloud-native development (AWS, Azure)
- Microservices and containerization
- DevOps implementation and CI/CD enablement
- Data modernization and analytics integration
Industries Served
SingleStone works across highly regulated and complex industries, including:
- Financial services
- Insurance
- Healthcare
- Public sector
What Sets SingleStone Apart
SingleStone stands out because of their people-first approach to application modernization. They go beyond simply updating code—focusing instead on reimagining workflows, empowering cross-functional teams, and aligning every technical decision with strategic business goals. With proven frameworks and a collaborative mindset, SingleStone accelerates time-to-value while ensuring quality, security, and lasting impact.
2. Capgemini
Overview
Capgemini is a global leader in consulting, technology services, and digital transformation. With a strong focus on application modernization, they help businesses reengineer legacy systems to deliver better performance, agility, and innovation.
Core Services
- Application rationalization and cloud migration
- API enablement and microservices transformation
- Agile software development
- Cloud-native modernization (AWS, Azure, GCP)
- Managed services and lifecycle support
Industries Served
Capgemini supports clients across industries including:
- Automotive
- Banking and capital markets
- Public sector
- Consumer goods and retail
What Sets Them Apart
Capgemini’s global delivery model and deep bench of technology experts allow them to execute complex modernization projects at scale. Their partnership ecosystem with hyperscalers and ERP platforms enhances their ability to provide integrated, end-to-end modernization solutions.
3. Cognizant
Overview
Cognizant delivers modernization services that help enterprises transform aging applications into cloud-first, digital-native platforms. Their approach blends modernization strategy, engineering, and emerging technologies like AI and automation.
Core Services
- Application portfolio assessment
- Cloud enablement and migration
- DevOps, containerization, and microservices
- Data and AI modernization
- Industry-specific digital platforms
Industries Served
Cognizant serves a wide range of industries, including:
- Life sciences and healthcare
- Manufacturing
- Financial services
- Telecommunications
What Sets Them Apart
Cognizant is known for its industry specialization and ability to drive modernization at enterprise scale. Their “Modern Engineering” approach emphasizes speed, continuous delivery, and business-aligned outcomes, making them a strong partner for complex legacy transformations.
4. Deloitte
Overview
Deloitte helps large enterprises modernize and optimize legacy applications through a blend of strategy, industry expertise, and deep technology capabilities. They focus on transforming outdated systems into scalable, secure, and intelligent platforms.
Core Services
- Application modernization and legacy system decommissioning
- Cloud strategy, migration, and optimization
- Platform engineering and modernization
- Cybersecurity and compliance integration
- Enterprise architecture design
Industries Served
Deloitte serves clients across nearly every major industry, including:
- Government and public services
- Energy and resources
- Healthcare
- Financial services
What Sets Them Apart
Deloitte’s strength lies in its ability to bring together strategic consulting with hands-on implementation. Their experience modernizing systems in regulated and mission-critical environments—backed by deep cloud and security expertise—makes them a go-to partner for enterprise transformation.
5. Infosys
Overview
Infosys is a global IT services leader that offers comprehensive application modernization services to help enterprises accelerate digital transformation. Their approach emphasizes automation, cloud-native architecture, and intelligent engineering.
Core Services
- Legacy application transformation
- Cloud migration and modernization
- AI-powered application development
- Platform reengineering and DevOps
- Mainframe modernization
Industries Served
Infosys works with clients across:
- Retail and eCommerce
- Banking and insurance
- Manufacturing
- Energy and utilities
What Sets Them Apart
Infosys leverages its proprietary tools—like Infosys Cobalt and Modernization Suite—to automate and streamline complex modernization efforts. Their global presence and deep technical talent make them a strong choice for multinational organizations looking to scale their modernization journeys.
6. Tata Consultancy Services (TCS)
Overview
TCS is one of the largest IT consulting firms in the world, providing robust application modernization services as part of its digital transformation portfolio. They focus on making applications more agile, efficient, and cloud-ready.
Core Services
- Legacy to cloud migration
- Microservices and containerization
- Mainframe transformation
- DevOps and continuous integration
- Platform modernization (SAP, Oracle, Microsoft)
Industries Served
TCS supports a wide range of industries, such as:
- Aerospace and defense
- Healthcare and life sciences
- Travel and hospitality
- Media and telecom
What Sets Them Apart
TCS stands out for its scale, automation tools, and industry-specific frameworks. Their Machine First™ approach integrates AI and automation into the modernization lifecycle to drive faster, smarter outcomes for complex enterprises.
7. IBM Consulting
Overview
IBM Consulting brings decades of enterprise technology expertise to the application modernization space. They specialize in modernizing mission-critical applications with a focus on hybrid cloud, security, and AI integration.
Core Services
- Legacy system transformation
- Cloud-native and hybrid cloud enablement
- AI and data integration
- Mainframe modernization (zSystems)
- Kubernetes and Red Hat OpenShift deployment
Industries Served
IBM works extensively in industries like:
- Financial services
- Government
- Supply chain and logistics
- Telecommunications
What Sets Them Apart
IBM Consulting combines cloud-native tools with advanced AI and automation, allowing for highly customized and secure modernization roadmaps. Their Red Hat and hybrid cloud expertise is especially valuable for organizations needing flexibility and control across cloud environments.
8. Wipro
Overview
Wipro offers end-to-end application modernization services that help global enterprises move from outdated monolithic systems to agile, cloud-native platforms. Their solutions are designed to enhance performance, reduce cost, and accelerate innovation.
Core Services
- Application reengineering and refactoring
- Mainframe modernization
- Cloud migration and containerization
- DevSecOps implementation
- AI and data-driven transformation
Industries Served
Wipro serves a global clientele across:
- Financial services
- Healthcare and pharmaceuticals
- Manufacturing
- Consumer and retail
What Sets Them Apart
Wipro combines engineering excellence with deep cloud and AI capabilities to deliver future-ready applications. Their investment in automation and partnerships with hyperscalers (AWS, Azure, Google Cloud) allow for fast, scalable modernization efforts.
9. Softura
Overview
Softura is a U.S.-based digital solutions company that specializes in custom software development and application modernization. They focus on helping mid-sized and enterprise clients transform legacy systems into high-performing, modern platforms.
Core Services
- Legacy application assessment and strategy
- Cloud-native development and migration
- Microsoft .NET modernization
- DevOps and CI/CD pipeline automation
- Mobile and web app transformation
Industries Served
Softura works with organizations in:
- Manufacturing
- Automotive
- Healthcare
- Government and education
What Sets Them Apart
Softura’s strength lies in its personalized, hands-on approach. Their Microsoft Gold Partner status and extensive experience with both modernization strategy and full-cycle development make them ideal for organizations seeking a dedicated, collaborative team.
10. Grid Dynamics
Overview
Grid Dynamics is a digital engineering company that helps enterprises modernize legacy systems through cloud-native architectures, AI, and scalable digital platforms. Their focus is on speed, innovation, and engineering excellence.
Core Services
- Application modernization and replatforming
- Cloud migration (AWS, Azure, GCP)
- DevOps and site reliability engineering (SRE)
- Data engineering and AI enablement
- Microservices and API architecture
Industries Served
Grid Dynamics works with global enterprises in:
- Retail and eCommerce
- Finance
- Technology
- Media and entertainment
What Sets Them Apart
Grid Dynamics combines Silicon Valley innovation with global delivery. Their agile methodology and focus on cloud-native scalability make them a strong partner for organizations looking to drive digital acceleration without compromising quality.
How to Choose the Right Application Modernization Partner
Finding the right partner for application modernization isn't just about technical skills—it’s about aligning with a team that understands your business, industry, and long-term goals. Here's what to look for as you evaluate your options:
Industry Expertise
Choose a partner who understands the unique challenges of your industry—especially if you're in a regulated space like healthcare, finance, or government. Domain knowledge ensures faster implementation and better compliance.
Technology Capabilities
Modernization can include rehosting, refactoring, or full rearchitecture. Look for a firm that’s experienced with cloud platforms (AWS, Azure, GCP), microservices, DevOps, and modern languages/frameworks like .NET Core, Java, and Kubernetes.
Cloud Partnerships
Strong relationships with cloud providers signal credibility. Certified partnerships with AWS, Microsoft Azure, or Google Cloud often come with access to advanced tools, funding programs, and faster deployments.
Collaborative Process
The best firms work with your internal team—not around them. Ask about their onboarding, documentation, and knowledge transfer process to ensure you're not left with a black-box solution.
Proven Track Record
Request case studies or references to validate past success. Look for measurable outcomes like reduced infrastructure costs, improved app performance, or shortened time-to-market.
Red Flags to Watch For
- One-size-fits-all proposals
- Vague timelines or deliverables
- Lack of post-launch support
- No clear modernization roadmap
Selecting the right partner can significantly accelerate your digital transformation—and help future-proof your business.
Modernize with Confidence
Application modernization isn’t just about upgrading your tech—it’s about building a foundation for long-term agility, growth, and innovation. Whether you're migrating legacy systems to the cloud or reengineering outdated applications for modern architectures, choosing the right partner makes all the difference.
The 10 companies on this list represent the best in the industry, offering a range of expertise, tools, and industry experience. Each one brings something unique to the table—but for businesses looking for a collaborative, results-driven approach, SingleStone Consulting is a top choice.
Work With SingleStone Consulting
If you're ready to transform your legacy applications and create scalable, modern digital experiences, SingleStone can help. Their team blends technical expertise with business strategy to ensure every modernization effort delivers long-term value. Contact us to learn more today!