With rapid digital shifts, enterprises are under pressure to modernize legacy applications to stay competitive. Application modernization isn’t just about migrating old systems to the cloud - it’s about reimagining architecture, improving scalability, boosting security, and enhancing performance using modern tools, microservices, and AI-driven infrastructure.
As companies increasingly shift toward cloud-native models, it’s crucial to partner with firms that bring deep domain knowledge, tech agility, and end-to-end transformation capabilities. Here's a curated list of top application modernization companies helping global organizations future-proof their digital core in 2025.
1. Radixweb
Founded: 2000
Headquarters: Ahmedabad, India Company
Size: 650+ professionals
Overview:
Radixweb is a trusted leader in enterprise-grade application modernization company, helping organizations reimagine and future-proof legacy systems through scalable, cloud-native architectures. With over two decades of experience, Radixweb enables U.S.-based enterprises and global startups to transform outdated applications into agile, secure, and innovation-driven platforms.
Having delivered 4,200+ successful modernization and transformation projects, the company stands out for its regulatory compliance, time zone-aligned collaboration, and transparent communication. Radixweb is the preferred partner for businesses aiming to unlock greater performance and longevity from their core applications.
Services:
Software product engineering, application modernization, custom software development, SaaS development, enterprise software solutions, data engineering and analytics, digital transformation and innovation.
Key Clients: Fire sprint, ECAT, XEROX, FastTrack, Verizon
2. Taazaa Inc.
Founded: 2007
Headquarters: Hudson, OH, USA (Dev team in India)
Company Size: 50–249
Overview:
Built on a belief that software should improve lives, Taazaa delivers modern, scalable, intuitive applications—from startups to Fortune 500s. Their agile methodology ensures faster delivery and alignment with business goals.
Services:
Custom software, web + mobile app development, cloud services, digital transformation, AI/ML, blockchain, IoT, big data, AR/VR, UX design, DevOps, QA, data engineering.
Key Clients: PulseBox, Caring24, Malley’s Chocolates, Lachina, Open i Networks, Vorrei, Wright Partners
3. Accenture
Founded: 1989
Headquarters: Dublin, Ireland
Company Size: ~700,000 employees
Overview:
A global digital transformation leader, Accenture delivers AI-driven innovation, automation, analytics, cloud tools, and cybersecurity for enterprise-scale app modernization. Their agile-first methodologies support re-platforming, DevSecOps, and full-lifecycle transformation.
Services:
Agile transformation, cloud-native re-platforming, DevSecOps, cybersecurity, analytics, intelligent automation, industry-specific modernization.
Key Clients: Global 2000 enterprises across sectors like financial services, retail, healthcare, telecom, and energy.
4. Cognizant
Founded: 1994
Headquarters: Teaneck, NJ, USA
Company Size: ~337,000 employees
Overview:
Cognizant transforms legacy and monolithic systems into modern, cloud-architected, microservices-based platforms. Their data-driven strategies are tailored to each industry.
Specialties:
Cloud migration, microservices, containerization (Docker/Kubernetes), DevOps automation, API-first integration, modernization strategy.
Key Clients:Major firms in banking, insurance, healthcare, retail, and manufacturing.
5. IBM Consulting
Founded: 1911 (rebranded as a distinct unit in 1991)
Headquarters: Armonk, NY, USA
Company Size: ~160,000 (consulting arm)
Overview:
IBM Consulting brings hybrid-cloud expertise using Red Hat OpenShift, AI tools, and analytics. They guide legacy-to-cloud migrations with security and governance built into each phase .
Specialties:
Containerization, hybrid cloud migration, AI-powered transformation, analytics, DevSecOps.
Key Clients: Fortune 500 companies across finance, telecom, retail, government, and healthcare.
6. Infosys
Founded: 1981
Headquarters: Bangalore, India
Company Size: ~300,000 employees globally
Overview:
Infosys uses a "Live Enterprise" model - incrementally refactoring legacy systems with microservices, API-first design, and DevSecOps - to enable modernization with minimal disruption.
Specialties:
Legacy analysis, code refactoring, microservices, API-led integration, cloud-native architecture, DevSecOps.
Key Clients: Global brands across financial services, retail, manufacturing, energy, and healthcare.
7. Tata Consultancy Services (TCS)
Founded: 1968
Headquarters: Mumbai, India
Company Size: ~500,000+ employees
Overview:
TCS delivers full-stack modernization, including mainframe rehosting, hybrid-cloud deployments, and industry-specific compliance via tools like MasterCraft™ and iCMC™.
Specialties:
Mainframe modernization, cloud enablement, governance, digital transformation, compliance.
Key Clients: Global enterprises in BFSI, telecom, manufacturing, consumer goods, government.
8. Capgemini
Founded: 1967
Headquarters: Paris, France
Company Size: ~340,000 employees globally
Overview:
Capgemini, a Forrester-recognized leader in modernization, takes a cloud-first approach focused on automation, low-code, AI, sustainability, and rapid time-to-market.
Specialties:
Re-platforming, DevOps, system integration, UX modernization, cloud migration.
Key Clients: Large corporations in finance, retail, manufacturing, utilities, and public sector.
9. N‑iX
Founded: 2002
Headquarters: Lviv (HQ in Malta)
Company Size: ~2,400 professionals
Overview:
Forrester-listed, N‑iX helps clients modernize legacy systems via code reviews, microservices, cloud migrations, DevOps, and UI/UX improvements.
Specialties:
Legacy-to-cloud re-architecture, CI/CD, API lifecycle, UX design, performance tuning.
Key Clients: Bosch, Siemens, eBay, Inditex, First Student, AVL.
10. Innowise
Founded: 2007
Headquarters: Warsaw, Poland
Company Size: ~2,200–2,300 IT professionals
Overview:
Innowise handles full-cycle modernization - re-engineering, containerization, APIs, QA, UX, and cloud consulting - across 40+ industries. A 2024 Inc. 5000 honoree, they’ve executed 1,300+ projects.
Specialties:
App modernization, containerization, API integration, QA, technical consulting.
Key Clients: BrightBox Group, Enable Development, Tack App.
Final Thoughts
As digital transformation accelerates in 2025, modernizing legacy systems isn’t optional-it’s essential for competitiveness. These companies bring proven expertise, innovative tools, and scalable methodologies to convert outdated systems into resilient, future-ready platforms. Choosing the right partner could be the key to unlocking speed, security, and agility in your digital strategy.
Curious about any of these firms or their methods? Just ask!