22 Best Legacy Software Modernization Companies (2026)
Many established businesses still rely on older software systems that were built decades ago. These legacy platforms often create limitations around speed, security, and the ability to integrate new technologies. Legacy software modernization companies step in to solve these challenges by transforming rigid, aging systems into flexible, future-ready platforms that support growth and innovation.
These specialized companies focus on assessing current systems, migrating critical data and functions, and implementing modern architectures like cloud solutions, microservices, and AI-enhanced tools. They work across industries to reduce maintenance costs, boost operational efficiency, and help organizations stay competitive in a fast-moving digital landscape.
1. Oski Solutions
At Oski Solutions, we build custom software and web applications for business modernization. Our company focuses on full-cycle development projects and offers team augmentation options to support operational scaling needs, works with .NET, Node.js, PHP and C# as core technologies while handling frontend work in React, Angular and Vue.js. Our team manages cloud setups on Azure and AWS with DevOps practices like Docker, Kubernetes and Terraform.
Our company provides legacy system modernization along with API integrations and CMS solutions based on Umbraco and WordPress. We deliver solutions for industries such as e-commerce, healthcare, fintech and logistics. Our team maintains an agile approach with transparent communication for long-term partnerships. We handle projects that range from new scalable applications to process automation initiatives and digital transformation efforts.
Key Highlights:
Custom software development expertise
Cloud migration capabilities
API integration services
Dedicated team support
Services:
Legacy software modernization
Cloud migration
API integration
Web application development
CMS based solutions
Contact Information:
Website: oski.site
Address: Kaupmehe tn 7-120, Tallinn, Estonia
Phone: +48571282759
E-mail: [email protected]
LinkedIn: www.linkedin.com/company/oski-solutions
Legacy Software Modernization Services
Modernize outdated systems, reduce technical debt, and boost performance with experienced teams.
2. TCS
TCS delivers services focused on updating older software systems for enterprises. The company works with clients across different sectors to shift from traditional setups toward more adaptable structures that incorporate cloud approaches and artificial intelligence elements. TCS handles projects that involve modernizing IT landscapes and building foundations for new capabilities.
In practice TCS supports efforts like migrating platforms and implementing domain specific systems. The company maintains partnerships with technology providers to assist in areas such as financial infrastructure updates and retail operations transformations. This kind of work helps organizations manage change while keeping core functions running smoothly during transitions.
Key Highlights:
Emphasis on perpetual adaptation in enterprise environments
Support for AI system design and deployment
Experience with financial market infrastructure projects
Services:
Cloud architecture implementation
AI integration for business processes
Application landscape updates
Data platform enhancements
Contact Information:
Website: www.tcs.com
Address: 400 University Avenue, 25th Floor, Toronto, Ontario, M5G 1S5, Canada
Phone: 647 790 7200
E-mail: [email protected]
LinkedIn: www.linkedin.com/company/tata-consultancy-services
Twitter: x.com/TCS
Facebook: www.facebook.com/TataConsultancyServices
Instagram: www.instagram.com/tcsglobal
3. Infosys
Infosys provides application modernization services that address legacy systems in various industries. The company assists organizations with moving toward AI enabled setups and cloud based environments. Infosys develops approaches that combine modernization with low code tools and agile practices to update existing applications.
The company works on mainframe projects and hybrid cloud transitions for clients seeking better performance and flexibility. Infosys offers solutions in areas like open source adoption and next generation development processes. This focus allows businesses to handle technical debt while exploring new opportunities in their operations.
Key Highlights:
Focus on AI economy integration
Support for enterprise agile methods
Experience with hybrid cloud setups
Services:
Low code application development
NextGen DevOps practices
Cloud migration and modernization
Mainframe modernization
Open source solutions
Contact Information:
Website: www.infosys.com
Address: Data Privacy Office, Infosys Limited, Electronics City, Hosur Road, Bangalore 560 100, India
Phone: +91 80 2852 0261
E-mail: [email protected]
LinkedIn: www.linkedin.com/company/infosys
Twitter: x.com/infosys
Facebook: www.facebook.com/Infosys
4. Accenture
Accenture offers modernization services centered on cloud technologies and application updates. The company helps businesses optimize legacy tech through coordinated efforts that span architecture and operations. Accenture guides clients in building digital cores that support faster adaptation and innovation.
The approach includes modernizing applications along with infrastructure and data foundations. Accenture works on creating interoperable components that emphasize security and automation. This helps organizations reduce constraints from older systems while improving overall capabilities.
Key Highlights:
Focus on sustainable IT capabilities
Coordination across technology processes and security
Development of cloud powered digital foundations
Services:
Network updates with cloud
Application and platform modernization
Infrastructure transformation
Data and AI foundation building
Digital core adoption strategies
Contact Information:
Website: www.accenture.com
Address: 395 9th Avenue, New York, NY, 10001
Phone: +19174524400
5. IBM
IBM delivers application modernization services with attention to brownfield environments and hybrid cloud. The company uses AI capabilities to support migration refactoring and extension of existing applications. Their team provides tools and methods for containerization and microservices implementation across platforms.
IBM assists with mainframe updates and cloud migration strategies that aim for better scalability. They develop roadmaps using collaborative methodologies to minimize disruptions during modernization. This includes agentic AI elements for code related tasks and portfolio assessments.
Key Highlights:
Brownfield application focus
Generative AI for development acceleration
Hybrid cloud strategy support
Services:
Container platform adoption
Migration and modernization planning
Mainframe application services
AI powered transformation tools
Cloud migration consulting
Contact Information:
Website: www.ibm.com
Address: 1 New Orchard Road, Armonk, New York 10504-1722, United States
Phone: 1-800-426-4968
LinkedIn: www.linkedin.com/company/ibm
Twitter: x.com/ibm
Instagram: www.instagram.com/ibm
6. Cognizant
Cognizant specializes in legacy modernization through AI led approaches. The company reimagines older systems to support growth and efficiency in areas like banking insurance and logistics. Cognizant applies platforms for cloud native transformations and business rule extraction.
The company offers data modernization alongside application updates to prepare infrastructure for larger scale AI use. Cognizant focuses on reducing risks with parallel strategies and traceability in projects. This helps shift spending from maintenance toward innovation activities.
Key Highlights:
AI driven system analysis
Cloud native architecture development
Full stack engineering platforms
Services:
Legacy system reengineering
Application modernization
Data modernization
AI engineering industrialization
Contact Information:
Website: www.cognizant.com
Address: 200 Somerset Corporate Blvd, Suite 8001, Bridgewater (New York metro) 08807, NJ
Phone: (908) 809-7000
E-mail: [email protected]
LinkedIn: www.linkedin.com/company/cognizant
Twitter: x.com/cognizant
Facebook: www.facebook.com/Cognizant
Instagram: www.instagram.com/cognizant
7. Capgemini
Capgemini works on application modernization to align legacy software with current business requirements. The company supports refactoring, rearchitecting and replacement options depending on needs. Capgemini incorporates cloud native practices APIs and agile methods in its projects.
Capgemini applies assessment tools and pre-built components to speed up development cycles. This contributes to better quality and faster market responses. The company assists organizations across industries with digital agility improvements and reduced server dependencies.
Key Highlights:
Alignment of applications with business needs
Multi pillar transformation approach
Use of accelerators for assessment
Services:
API integration
DevOps implementation
Cloud native architecture
Application rearchitecting
Contact Information:
Website: www.capgemini.com
Address: 3475 Piedmont Road, Suite 1400, Atlanta, GA 30305
Phone: 1-404-806-4200
LinkedIn: www.linkedin.com/company/capgemini
Facebook: www.facebook.com/capgemini
Instagram: www.instagram.com/capgemini
8. Net-devs
net-devs builds enterprise software with a mix of human oversight and AI support. The company puts senior engineers in charge of architecture and quality decisions while AI handles routine tasks like drafting and testing. net-devs works across different technology stacks and maintains a stack-agnostic approach to match tools to specific project needs.
The delivery process at net-devs includes discovery sessions with stakeholders followed by design steps and AI-augmented building phases. The company emphasizes transparent pricing and senior leadership on every project. This setup allows for faster development cycles without compromising on final code quality or accountability.
Key Highlights:
Senior engineer leadership on all projects
AI support for drafting and testing
Focus on architecture decisions by humans
Transparent pricing model
Services:
Enterprise development
AI engineering
Cloud platform work
Modern front-end development
Contact Information:
Website: net-devs.com
Address: Obrzeżna 1D, 02-691 Warszawa
Phone: +48 571 282 759
E-mail: [email protected]
LinkedIn: www.linkedin.com/company/net-devs
9. Lengreo
Lengreo operates as a marketing and technology partner for businesses. The company provides appointment setting and demand generation support through personalized outreach methods. Lengreo handles content marketing and social media management for different platforms. This combination helps organizations manage their online presence and interactions with potential customers.
The company offers services in digital strategy consulting along with website development and lead generation activities. Lengreo works on SEO efforts and paid advertising campaigns to support client visibility online.
Key Highlights:
Lead generation focus
SEO optimization services
Digital marketing strategy consulting
Website development capabilities
Services:
Demand generation
Custom web development
Paid ads management
Social media content creation
Appointment setting
Contact Information:
Website: lengreo.com
Address: Vrijstraat 9 C/D, 5611 AT Eindhoven, Netherlands
Email: [email protected]
Phone: +31 686 147 566
LinkedIn: www.linkedin.com/company/lengreo
Twitter: x.com/Lengreo
Instagram: www.instagram.com/lengreo.agency
10. Wipro
Wipro delivers consulting-led approaches to help enterprises with technology updates. The company applies AI infused platforms for transformation projects across different business areas. They support application modernization efforts and work on cloud related initiatives.
Wipro engages in partnerships for business and IT modernization projects. Wipro focuses on areas such as manufacturing excellence and financial infrastructure updates. This work involves data informed planning and AI powered strategies for operational improvements.
Key Highlights:
Partnership driven projects
AI infused transformation platforms
Consulting led modernization
Industry specific solution development
Services:
Business process support
Application modernization
Cloud optimization
AI implementation
Contact Information:
Website: www.wipro.com
Address: Doddakannelli, Sarjapur Road, Bengaluru - 560035
Phone: +91 (80) 61427999
E-mail: [email protected]
LinkedIn: www.linkedin.com/company/wipro
Facebook: www.facebook.com/WiproLimited
Instagram: www.instagram.com/wiprolimited
11. HCLTech
HCLTech provides technology services with attention to AI and cloud solutions. The company works on enterprise system modernization and develops platforms for autonomous operations. HCLTech supports engineering and research activities across various sectors.
The company offers cloud optimization services and application development support. HCLTech engages in product engineering and digital workplace solutions. This includes cybersecurity measures and supply chain management tools for business processes.
Key Highlights:
AI and generative AI services
Cloud optimization offerings
Engineering and research focus
Autonomous platform development
Services:
Cloud solutions
Application modernization
Cybersecurity services
Digital engineering
Business process operations
Contact Information:
Website: www.hcltech.com
Address: Plot No. 3A, Sector 126 | Noida – 201304, India
LinkedIn: www.linkedin.com/company/hcltech
Twitter: x.com/hcltech
Facebook: www.facebook.com/HCLTechOfficial
Instagram: www.instagram.com/hcltech
12. A-listware
A-listware supplies software development and consulting services. The company manages dedicated development teams and offers application services for different business needs. A-listware handles infrastructure management and data analytics projects.
The company provides UX UI design along with testing and quality assurance. A-listware supports cloud application development and enterprise software creation. This includes work on custom solutions and team augmentation for ongoing projects.
Key Highlights:
Dedicated development team management
Infrastructure and application support
Data analytics capabilities
Team augmentation options
Services:
Software development outsourcing
UX UI design
Testing and QA
IT consulting
Cloud application development
Contact Information:
Website: a-listware.com
Address: North Bergen, NJ 07047, USA
Phone: +1 (888) 337 93 73
Email: [email protected]
Facebook: www.facebook.com/alistware
LinkedIn: www.linkedin.com/company/a-listware
13. DXC
DXC builds software solutions that incorporate AI and automation elements. The company focuses on development and engineering practices for secure connected applications. DXC works on application experience design and integration services across platforms.
The company supports low code platforms and agile capacity services for faster delivery. DXC handles embedded product engineering and cloud native builds on major providers. This approach aims at streamlining workflows and improving operational efficiency.
Key Highlights:
AI augmented development platform
Application integration services
Low code platform expertise
Agile capacity support
Services:
Software development engineering
Application experience design
Cloud native development
Low code application platforms
Contact Information:
Website: dxc.com
Phone: 1-800-401-1957
E-mail: [email protected]
LinkedIn: www.linkedin.com/company/dxctechnology
Instagram: www.instagram.com/dxctechnology
14. 21century.tech
21century.tech runs an AI native software studio for building production applications. The company combines senior engineers with AI tools for development tasks while keeping human review on all code. 21century.tech delivers projects on accelerated timelines through this paired approach.
The studio handles architecture decisions and quality control directly by senior staff. 21century.tech supports full stack features and legacy refactors in shorter cycles. The process includes daily demonstrations and deployment to client infrastructure.
Key Highlights:
AI augmented building process
Senior engineer code review
Accelerated delivery cycles
Human led architecture
Services:
Third party integration
Full stack feature development
Legacy system refactor
MVP creation
Contact Information:
Website: 21century.tech
E-mail: [email protected]
15. Gilzor
Gilzor develops custom software solutions for startups and small to medium businesses. The company handles idea validation along with business analysis to shape product directions.
The company creates UI UX designs with a user centric focus and performs quality assurance to address potential issues early. Gilzor assists with go to market strategies and delivers ongoing support after launch. This approach helps businesses test concepts and scale digital products across various industries. Gilzor offers mobile and web development services while providing research and development support for new technology implementations.
Key Highlights:
Idea validation and consulting services
Business analysis for product needs
Research and development capabilities
Services:
Mobile development
Web development
UI UX design
Quality assurance
Support and maintenance
Contact Information:
Website: www.gilzor.com
Address: Poland, Warsaw, Office 58, street Adama Mickiewicza 37, 01-625
E-mail: [email protected]
LinkedIn: www.linkedin.com/company/gilzor-softwaredevelopment
16. Endava
Endava works on application management and modernization projects. The company helps businesses update their digital systems by using its technical experience and knowledge of different industries. Endava develops solutions that address complex technology requirements for different sectors.
The company maintains partnerships and alliances while focusing on practical implementation of modern systems. Endava delivers services that help organizations update their application landscapes. This includes attention to ongoing management and improvement of existing setups.
Key Highlights:
Application modernization focus
Industry specific capabilities
Partnership and alliance work
Services:
Application management
Digital transformation support
Case study development
Contact Information:
Website: www.endava.com
Address: Millennium Tower, Handelskai 94-96, 23rd floor, 1200 Vienna, Austria
LinkedIn: www.linkedin.com/company/endava
Twitter: x.com/endava
Facebook: www.facebook.com/endava
Instagram: www.instagram.com/endava
17. Thoughtworks
Thoughtworks develops platforms such as AI/works to support industrial-grade system development. The company focuses on practical AI implementation backed by strong engineering practices and clear transformation strategies. Thoughtworks also works on mainframe modernization projects that incorporate generative AI methods.
The company partners with major cloud and data providers as part of its engineering service delivery. Thoughtworks assists organizations in refreshing and rethinking their existing technology environments to better match present-day requirements. This covers areas like agentic development and real-world AI application building.
Key Highlights:
Mainframe modernization support
AI works platform development
Transformation pathway guidance
Services:
Cloud partnerships
AI implementation
Engineering services
Data management
Contact Information:
Website: www.thoughtworks.com
Address: Land of the Turrbal and Jagera/Yuggera Peoples, Level 3, 300 Adelaide Street, Brisbane City QLD 4000
E-mail: [email protected]
LinkedIn: www.linkedin.com/company/thoughtworks
Twitter: x.com/thoughtworks
Facebook: www.facebook.com/Thoughtworks
Instagram: www.instagram.com/thoughtwork
18. EPAM
EPAM creates digital experiences by combining technology and design skills. The company takes a thoughtful approach to reshaping business processes through tailored and inventive solutions. EPAM brings custom development expertise to a wide range of industries.
The company maintains strong partnerships with leading technology providers and builds a broad network of alliances. EPAM focuses on enterprise software initiatives and supports digital transformation efforts across different sectors. This often involves integrating artificial intelligence capabilities and cloud-based architectures. In many cases, EPAM helps organizations bridge the gap between legacy systems and future-ready environments while keeping operations stable throughout the transition.
Key Highlights:
Digital experience delivery
Technology partnership network
Industry focused solutions
Services:
Software development
Artificial intelligence solutions
Cloud engineering
Strategy consulting
Contact Information:
Website: www.epam.com
Address: 41 University Drive, Suite 202, Newtown, PA 18940, USA
Phone: +1-267-759-9000
LinkedIn: www.linkedin.com/company/epam-systems
Facebook: www.facebook.com/EPAM.Global
Instagram: www.instagram.com/epamsystems
19. Mobian
Mobian builds dedicated engineering teams for software projects. The company specializes in mobile and AI solutions while offering both outsourcing and outstaffing models. Mobian handles legacy integration and full stack delivery for various sectors.
The company provides end to end product development with attention to scalable architecture. Mobian supports healthcare fintech and logistics domains through domain specific knowledge. This includes post launch partnership and continuous maintenance options.
Key Highlights:
AI and automation systems
Dedicated team model
Legacy integration work
Services:
Mobile development
Full stack delivery
Scalable architecture design
Post launch support
Contact Information:
Website: mobian.studio
Address: Harju maakond, Tallinn, Kesklinna linnaosa, Masina tn 22, 10113, Estonia
E-mail: [email protected]
LinkedIn: www.linkedin.com/company/mobian-studio
20. SoftPro
SoftPro develops custom software solutions built primarily on Microsoft technologies. The company creates web applications and cloud-based systems tailored to everyday business requirements. SoftPro also integrates artificial intelligence capabilities into its development work.
They specialize in modernizing business processes using frontend, backend, and various CMS platforms. SoftPro pays close attention to building solutions that deliver good scalability and solid performance. This often involves projects on Azure and other cloud environments.
Key Highlights:
Microsoft stack expertise
Cloud development services
Artificial intelligence solutions
Services:
Software development
Cloud development
Web application development
Contact Information:
Website: soft-pro.pl
Address: 13 Erasmus Ciołka St. 401, Warsaw, Poland
Phone: +48 571 282 759
LinkedIn: www.linkedin.com/in/kyrylo-o
21. BairesDev
BairesDev offers custom software development services along with QA and testing capabilities. The company works on AI and data science projects while building mobile applications for different platforms. They handle UX UI design and provide platform and infrastructure support through DevOps practices.
BairesDev maintains expertise across various technologies and supports full stack development needs. The team assembles teams for dedicated projects and staff augmentation arrangements. This setup helps organizations update their development processes and integrate modern tools into existing workflows.
Key Highlights:
Custom software development focus
AI and data science projects
Platform infrastructure support
Services:
QA and testing
Mobile app development
UX UI design
DevOps engineering
Contact Information:
Website: www.bairesdev.com
Address: 50 California Street, San Francisco,USA
Phone: +1 (408) 478-2739
LinkedIn: www.linkedin.com/company/bairesdev
Twitter: x.com/bairesdev
Facebook: www.facebook.com/bairesdev
Instagram: www.instagram.com/bairesdev
22. N-iX
N-iX provides application modernization services to help organizations update their systems. The company conducts assessments of legacy software and develops modernization strategies with architecture advisory. N-iX supports monolith to microservices migrations and handles infrastructure moves to cloud environments.
The company works on user experience upgrades and technical debt management during re-engineering phases. N-iX offers consulting alongside engineering modernization and post-modernization support. This process includes containerization and cloud migration steps for different types of applications.
Key Highlights:
Infrastructure modernization options
Application modernization consulting
Architecture modernization work
Services:
User experience upgrade
Engineering modernization
Cloud migration
Technical debt management
Contact Information:
Website: www.n-ix.com
Address: 4330 W Broward Boulevard – Space P/Q, Plantation, FL 33317
Phone: +17273415669
E-mail: [email protected]
LinkedIn: www.linkedin.com/company/n-ix
Twitter: x.com/N_iX_Global
Facebook: www.facebook.com/N.iX.Company
Wrapping It Up
Choosing the right legacy software modernization company takes some thought. Each firm has its own style - some excel at AI-powered refactoring, others at smooth cloud moves or keeping systems stable during transition.
Ultimately, success comes down to fit. Look at their real projects, ask tough questions about handling complications, and be honest about your priorities like speed, budget, or minimal disruption. Done right, modernization gives your business room to grow and operate much more effectively.
If you're evaluating options now, feel free to share what you're facing - sometimes a quick chat helps clarify the path forward.
