Many organizations in India and across the globe still run on legacy systems that were built decades ago. These platforms often hold critical business logic, yet they create headaches with high maintenance costs, limited scalability, and growing security risks. As digital demands increase, more companies are turning to specialized modernization partners based in India to breathe new life into their old software without losing what already works.

The top legacy system modernization companies in India stand out for their deep technical expertise and practical approach. They combine proven strategies like re-platforming, microservices architecture, cloud migration, and AI-driven automation to deliver smoother transitions and measurable improvements in performance and efficiency.

1. OSKI Solutions

OSKI Solutions delivers custom software development services with a strong focus on legacy system modernization in India. We understand the specific needs of the Indian market where many enterprises and ambitious start-ups still rely on older systems that benefit from careful updates and modernization. Our work includes full-cycle development combined with practical steps in cloud migration, digital transformation, and microservice architecture to help organizations keep pace with current demands.

We also offer dedicated team and IT outsourcing options along with team augmentation through outstaffing arrangements that suit the dynamic Indian tech environment. This covers web application development, API integration, React development, .NET development, Node.js development, Azure development, and AWS solutions. We frequently work with CMS based solutions as an Umbraco partner and handle integrations involving AWS Cognito, Okta, MSSQL, Tailwind, AWS Lambda, along with machine learning and integrated AI components for projects in e-commerce, healthcare, fintech, edtech, logistics and supply chain, and manufacturing.

Key Highlights:

• Custom software development expertise

• Legacy system modernization capabilities

• Cloud migration and digital transformation

• API integration and microservice architecture

• Dedicated team and IT outsourcing

Services:

• Legacy system modernization in india

• Custom software development

• Web application development

• Cloud migration

• Digital transformation

• API integration

• .NET development

• React development

• Node.js development

• Azure development

Contact Information:

• Website: oski.site

• Phone: +48571282759

• Email: contact@oski.site

• Address: Kaupmehe tn 7, 10114 Tallinn, Estonia

• LinkedIn: www.linkedin.com/company/oski-solutions

2. SunTec India

SunTec India works with organizations that need to update their older applications. The company carries out re-architecting of monolithic systems into microservices, performs structural analysis, and provides advisory support during the planning stage. They also handle containerization to prepare applications for cloud environments and conduct cloud migration projects that include rehosting, replatforming, and hybrid setups.

In addition SunTec India modernizes user interfaces and experiences with usability testing and improved navigation. The company integrates next-generation technologies such as AI, machine learning, IoT, and big data analytics into existing systems. Their process usually follows assessment and analysis, technology selection, code refactoring, and careful testing with deployment that aims to keep downtime low. They also offer ongoing support and maintenance after the main work finishes.

Key Highlights:

• Re-architecting monoliths into microservices

• Application containerization and cloud migration

• UI/UX modernization with usability testing

• Integration of AI, IoT, and big data

• Post-modernization support and maintenance

Services:

• Code refactoring and optimization

• Database analysis and updates

• API development for better integration

• Performance monitoring after deployment

• Technology compatibility assessments

• Hybrid cloud environment setup

Contact Information:

• Website: www.suntecindia.net

• Phone: +919311468458

• Email: info@suntecindia.net

• Address: Floor 3, Vardhman Times Plaza, Plot 13, DDA Community Centre, Road 44, Pitampura, New Delhi - 110 034, INDIA

• LinkedIn: www.linkedin.com/company/suntecindiadotnet

• Facebook: www.facebook.com/SuntecIndia.net1

• Twitter: x.com/SunTecIndiaNet

3. Appnox

Appnox focuses on turning legacy systems into more agile and scalable platforms. The company handles application re-engineering by recoding parts of the software, redesigning interfaces, and ensuring compatibility with newer devices and platforms. They also manage cloud migration projects and introduce API and microservices architectures to replace older monolithic structures.

Appnox carries out database modernization to move data into higher-performance systems like PostgreSQL or MongoDB. The company upgrades security protocols to meet current standards and optimizes performance so applications can handle increased workloads. Their work often includes technology stack refreshes using modern frameworks and tools along with integration of edge computing or IoT where it makes sense for the project.

Key Highlights:

• Application re-engineering and code restructuring

• Cloud migration to modern environments

• API and microservices integration

• Database modernization with secure options

• Security and compliance upgrades

• UI/UX revamp for better usability

Services:

• Technology stack modernization

• Performance optimization and scalability improvements

• Refactoring of existing codebases

• Integration of AI and automation tools

• Edge computing setup for real-time processing

Contact Information:

• Website: appnox.ai

• Phone: +971 544 219 791

• Email: sales@appnox.ai

• Address: 11th Floor, GM IT Park , Sector 142, Noida, Uttar Pradesh, 201305

• LinkedIn: www.linkedin.com/company/appnox

• Facebook: www.facebook.com/p/Appnox-Technologies-100086321652032

• Twitter: x.com/appnoxtech

• Instagram: www.instagram.com/appnox.ai

4. Thoughtworks

Thoughtworks helps organizations move away from rigid legacy architectures toward platforms that can scale and adapt more easily. The company works on stabilizing systems that are still in active use while planning for longer-term rebuilding. They apply AI-driven approaches to speed up parts of the modernization process, including reverse engineering and decision-making around trade-offs.

Thoughtworks also supports decommissioning of legacy components once newer platforms are ready. Their work in India forms an important part of delivery for many projects, with attention to both technical stability and business alignment during the transition. The focus remains on creating foundations that evolve rather than staying locked into old patterns.

Key Highlights:

• Stabilization of current legacy systems

• AI-supported rebuilding of core platforms

• Reverse engineering with AI tools

• Decommissioning of outdated components

Services:

• Transition planning to scalable architectures

• Managed services for ongoing support

• Data strategy alignment during modernization

Contact Information:

• Website: www.thoughtworks.com

• Phone: +86 010 5602 1951

• Email: contact-in@thoughtworks.com

• Address: ACR Mansion G + 3floors, 147/F, 8th Main, 3rd Block Koramangala, Bengaluru, Karnataka 560034

• LinkedIn: www.linkedin.com/company/thoughtworks

• Facebook: www.facebook.com/Thoughtworks

• Twitter: x.com/thoughtworks

• Instagram: www.instagram.com/thoughtworks

5. Radixweb

Radixweb carries out modernization of outdated IT systems with an emphasis on security and practical updates. The company uses AI-led tools for auditing legacy code and creates custom roadmaps for each project. They focus on migration activities that aim to avoid major disruptions to daily operations.

Radixweb moves systems toward cloud-native designs and applies low-code frameworks where suitable. Their work includes refactoring and optimization steps that prepare applications for future needs while keeping security as a priority throughout the process.

Key Highlights:

• AI-led audit of legacy systems

• Custom modernization roadmaps

• Migration with minimal operational disruption

• Cloud-native architecture adoption

Services:

• Security-focused system updates

• Code refactoring and restructuring

• Low-code framework implementation

• Long-term optimization planning

Contact Information:

• Website: www.radixweb.com

• Phone: +91-79-35200685

• Email: biz@radixweb.in

• Address: Ekyarth, B/H Nirma, University, Chharodi, Ahmedabad – 382481 India

• LinkedIn: www.linkedin.com/company/radixweb

• Facebook: www.facebook.com/radixweb

• Twitter: x.com/radixweb

• Instagram: www.instagram.com/radixweb

6. Simform

Simform starts most modernization projects with a detailed assessment of existing legacy applications and their alignment with current business goals. The company then supports end-to-end cloud migration, including rehosting, refactoring, and database transfers with efforts to keep downtime close to zero. They also handle re-architecture of applications to fit newer platforms.

In addition Simform works on redesigning user interfaces and experiences through testing and simplification of user flows. The company brings experience from frontend and UX-focused work into these projects. Their delivery centers in India and other locations support full-cycle development that includes prototyping and iterative improvements.

Key Highlights:

• Assessment of legacy application workloads

• Cloud-native transformation and migration

• Application re-architecture and redesign

• UX-led modernization approaches

Services:

• End-to-end workload migration

• Database and code modernization

• UI/UX reevaluation and user testing

• Integration with modern frameworks

• Microfrontends and PWA implementation

Contact Information:

• Website: www.simform.com 

• Phone: 13212372727

• Email: contactus@simform.com

• LinkedIn: www.linkedin.com/company/simform

• Facebook: www.facebook.com/simform

• Twitter: x.com/simform

7. Coforge

Coforge applies AI-infused methods to legacy application modernization with a focus on incremental changes. The company offers consulting that includes portfolio assessments and reverse engineering to understand business rules hidden in old code. They perform in-place optimization and support accelerated cloud adoption with minimal code rewrites where possible.

Coforge also handles application rewrites that create hybrid infrastructures connecting on-premises and cloud resources. Their services cover mainframe modernization and decommissioning of systems that are no longer needed using structured frameworks. The work often includes AI-assisted refactoring, testing, and planning to reduce complexity over time.

Key Highlights:

• AI-infused consulting and advisory

• In-place modernization and optimization

• Application rewrite for hybrid models

• Mainframe modernization support

Services:

• AI-assisted code refactoring

• Portfolio rationalization

• Application decommissioning framework

• Cloud adoption with incremental steps

• Reverse engineering with Gen-AI tools

Contact Information:

• Website: www.coforge.com

• Phone: +91-0120-4592300

• Address: Plot No TZ 2 & 2A, Sector Tech Zone, Greater Noida, Gautam Buddha Nagar, UP-201308

• LinkedIn: www.linkedin.com/company/coforge-tech

• Facebook: www.facebook.com/coforge.company

• Twitter: x.com/Coforge_Tech

• Instagram: www.instagram.com/coforge.company

8. eSparkBiz

eSparkBiz handles enterprise application modernization projects for organizations looking to update their older systems. The company works on digital transformation of legacy setups by assessing current applications and planning step-by-step upgrades. They focus on moving systems toward more flexible architectures while keeping core business functions intact.

In practice eSparkBiz carries out code refactoring and integration work that connects legacy parts with newer technologies. The company also supports cloud adoption and interface improvements during these projects. Their approach usually involves careful analysis followed by implementation phases that aim to reduce future maintenance efforts without sudden disruptions.

Key Highlights:

• Enterprise application modernization

• Digital transformation of legacy systems

• Code refactoring and integration

• Cloud adoption planning

• Interface improvement work

Services:

• System assessment and analysis

• Architecture planning for updates

• Technology integration steps

• Maintenance strategy development

Contact Information:

• Website: www.esparkinfo.com

• Phone: (+91) - 6353453248

• Email: sales@esparkinfo.com

• Address: The Orion, Near Shree Balaji Temple, SG Highway, Ahmedabad - 382481, Gujarat

• LinkedIn: www.linkedin.com/company/esparkinfo

• Facebook: www.facebook.com/esparkbiz

• Twitter: x.com/esparkbiz

• Instagram: www.instagram.com/esparkbiz

9. SolGuruz

SolGuruz works with legacy enterprise applications and helps migrate them into modern environments. The company carries out cloud migration along with re-engineering of older code structures. They also perform UX refresh activities to update how users interact with the systems.

SolGuruz focuses on upgrading software that has become outdated so it can continue supporting business operations longer. The process includes steps to make applications more secure and adaptable. Their work often combines several modernization techniques depending on what the existing setup requires.

Key Highlights:

• Modernization of legacy enterprise applications

• Cloud-native migration projects

• Data security considerations

• Re-engineering of old systems

• UX refresh for legacy software

Services:

• Cloud migration for outdated platforms

• Application re-architecture

• Risk reduction during upgrades

• Lifespan extension for existing software

• Integration with modern tools

Contact Information:

• Website: solguruz.com 

• Phone: +1 (724) 577-7737

• Email: sales@solguruz.com

• Address: 10, Sundarvan Society, Near AUDA Office, Ashram Road, Usmanpura, Ahmedabad, Gujarat 380014, India

• LinkedIn: www.linkedin.com/company/solguruz

• Facebook: www.facebook.com/SolGuruzHQ

• Twitter: x.com/SolGuruz

• Instagram: www.instagram.com/solguruz

10. 7EDGE

7EDGE delivers custom application modernization services with attention to enterprise needs. The company supports cloud-based transformation of older systems by redesigning parts of the architecture. They work on updating applications so they fit better with current infrastructure and requirements.

In these projects 7EDGE handles both technical updates and planning for smoother transitions. The company applies practical methods to move legacy components forward without losing important functionality. Their services come through delivery in Bengaluru where they manage full modernization cycles.

Key Highlights:

• Custom app modernization

• Cloud-based transformation

• Enterprise system updates

• Architecture redesign work

Services:

• Legacy application assessment

• Code and structure updates

• Cloud infrastructure alignment

• Transition planning and support

Contact Information:

• Website: 7edge.com

• Phone: +91 702 222 2227

• Email: ask@7edge.com

• Address: Salarpuria Symbiosis, Arekere Village, Bannerghatta Rd, Begur Hobli, Bengaluru, Karnataka 560076

• LinkedIn: www.linkedin.com/company/7edge

• Facebook: www.facebook.com/7EDGEx

• Twitter: x.com/7edgex

• Instagram: www.instagram.com/7EDGEx

11. Albiorix Technology

Albiorix Technology offers application modernization services as part of its custom software development work. The company focuses on enterprise app modernization and supports digital transformation initiatives. They create scalable and secure systems that fit large-scale organizational requirements.

Albiorix Technology uses modern technologies and agile practices in these projects while integrating AI-powered solutions where appropriate. The company handles full-cycle development that includes design, implementation, and ongoing support. Their work in Ahmedabad often involves tailoring solutions to specific industry needs and operational workflows.

Key Highlights:

• Enterprise app modernization

• Digital transformation support

• Custom software development for modernization

• AI integration in updated systems

Services:

• Bespoke application development

• SaaS development with modern architecture

• Full stack development and integration

• Odoo ERP customization and updates

• Digital product development with AI features

Contact Information:

• Website: www.albiorixtech.com 

• Phone: (+91) 991-308-8360

• Email: sales@albiorix.com

• Address: 712, Palak Prime, Ambli Road, Opp. Hotel DoubleTree by Hilton, Sanidhya, Ahmedabad, Gujarat 380058

• LinkedIn: www.linkedin.com/company/lifeatalbiorix 

• Facebook: www.facebook.com/albiorix.technology

• Twitter: x.com/AlbiorixT

• Instagram: www.instagram.com/albiorixtech

12. Clarion Technologies

Clarion Technologies provides application modernization services with a focus on practical upgrades for existing systems. The company works on transforming older applications into versions that fit better with today's infrastructure. They carry out assessment and targeted changes as part of the process.

Clarion Technologies handles modernization projects in Pune by applying structured methods to update legacy setups. The company supports steps that move applications forward while maintaining core operations. Their services cover various aspects needed for a smoother shift to modern platforms.

Key Highlights:

• Application modernization services

• Legacy system transformation

• Structured upgrade processes

• Infrastructure alignment work

Services:

• System assessment

• Code and architecture updates

• Integration planning

• Transition support

Contact Information:

• Website: www.clariontech.com

• Phone: +1 (888)-551-0371

• Email: info@clariontech.com

• Address: The Hive, Raja Bahadur Mill Road, Beside Sheraton Grand Hotel, Sangamvadi, Pune - 411001

• LinkedIn: www.linkedin.com/company/clariontechnologies

• Twitter: x.com/Clarion_Tech

• Instagram: www.instagram.com/clarion_technologies

13. CipherNutz

CipherNutz offers legacy application modernization services with a focus on mainframe and COBOL systems along with legacy Java applications. The company works on updating outdated systems through methods that aim for zero business disruption during the process. They apply automated code conversion with minimal manual intervention and use patterns such as the Strangler Fig approach for gradual changes.

CipherNutz handles mainframe modernization by migrating COBOL and PL/1 applications toward cloud-native setups in languages like Java, .NET, or Python while keeping business logic intact. The company also performs database modernization to move rigid legacy databases into more scalable platforms. Their services include replatforming to cloud environments, microservices rearchitecting with Domain-Driven Design, and UI/UX updates that refresh interfaces without altering backends.

Key Highlights:

• Mainframe and COBOL modernization

• Legacy Java application updates

• Zero-disruption migration approaches

• Automated code refactoring

• Database modernization to scalable platforms

Services:

• Replatforming to cloud environments

• Microservices rearchitecting using Domain-Driven Design

• Strangler Fig pattern implementation

• Cloud-native transformation with CI/CD pipelines

• UI/UX modernization for legacy interfaces

• Data integration and consistency checks

Contact Information:

• Website: ciphernutz.com

• Phone: +91 70160 03347

• Email: hello@ciphernutz.com

• Address: 303, SNS Business Park, Opp. J. H. Ambani School, Vesu, Surat, Gujarat - 395007

• LinkedIn: www.linkedin.com/company/ciphernutz-it-services

• Instagram: www.instagram.com/ciphernutz

14. Infosys

Infosys offers application modernization services with a cloud-first and AI-first focus. The company helps organizations update legacy data and applications through advisory work, in-place optimization, and full transformation journeys. Infosys applies a multistrategy method that includes low-code platforms and open source tools to manage technical debt.

Infosys also runs a dedicated mainframe modernization practice that follows an accelerate-renew-transform approach. The company performs rehosting with minimal changes, rebuilding in modern languages, and replacing with packaged solutions when suitable. Their work includes exposing mainframe business logic through APIs and converting batch processes to real-time operations.

Key Highlights:

• Application modernization with AI and cloud

• Mainframe modernization offerings

• In-place optimization services

• Accelerate renew transform approach

• API exposure for legacy logic

Services:

• Advisory and roadmap creation

• Low-code application development

• Rehosting and rebuilding of applications

• Technical debt management

• Batch workload modernization

• Decommissioning of legacy components

Contact Information:

• Website: www.infosys.com

• Phone: +91 80 2852 0261

• Address: Plot No.44/97 A, 3rd cross, Electronic City, Hosur Road, Bengaluru-560 100

• LinkedIn: www.linkedin.com/company/infosys

• Facebook: www.facebook.com/Infosys

• Twitter: x.com/Infosys

15. Wipro

Wipro provides legacy modernization solutions that include re-hosting, re-engineering, and re-writing of mainframe application code. The company uses mainframe emulation products and applies techniques such as Save My MIPS and Rules Modernization to move applications to open systems like Linux, Windows, or Unix. Wipro focuses on optimizing and simplifying existing applications during the process.

Wipro also offers application simplification services that support cloud adoption and re-architecting. The company works on standardizing, rationalizing, and scaling applications while introducing microservices and API approaches. Their toolkit includes automation for migration and accelerated development to help legacy systems meet digital requirements.

Key Highlights:

• Legacy modernization through re-hosting

• Rules modernization and Save My MIPS

• Application re-engineering and re-writing

• Host transformation for open systems

• Microservices and API integration

Services:

• Application simplification and rationalization

• Cloud adoption and re-architecting

• Automated migration toolkit usage

• Digital modernization platform support

• Legacy code optimization activities

Contact Information:

• Website: www.wipro.com 

• Email: info@wipro.com

• Phone: +91 (80) 61427999

• Address: Plot no 1, 7, 8 & 9, Block DM Sector V Salt Lake Kolkata - 700091

• LinkedIn: www.linkedin.com/company/wipro

• Facebook: www.facebook.com/WiproLimited

• Instagram: www.instagram.com/wiprolimited

16. Persistent Systems

Persistent Systems offers legacy software product modernization services that focus on updating product portfolios with cloud-native technologies. The company applies approaches such as container enablement, micro frontends, and monolith-to-microservices refactoring. Persistent Systems uses architectures like MACH (microservices, API-first, cloud-native, headless) to enhance existing software products.

Persistent Systems also provides site reliability engineering support and orchestration with Kubernetes to improve deployment and operations. The company works on redesigning and extending legacy products to meet evolving requirements while maintaining compatibility with modern environments. Their glossary explains modernization as updating or rebuilding applications for better performance and flexibility.

Key Highlights:

• Legacy software product modernization

• Cloud-native architecture adoption

• Monolith to microservices refactoring

• Container orchestration with Kubernetes

• MACH architecture implementation

Services:

• Product portfolio redesign and enhancement

• Micro frontends for modular integration

• Site reliability engineering for operations

• Zero-touch deployment automation

• Legacy application re-architecture

Contact Information:

• Website: www.persistent.com 

• Phone: +91-20-6746-2004

• Email: info@persistent.com

• Address: Bhageerath, 402 Senapati Bapat Road, Pune 411 016, India

• LinkedIn: www.linkedin.com/company/persistent-systems

• Facebook: www.facebook.com/PersistentSystems

• Twitter: x.com/Persistentsys

• Instagram: www.instagram.com/persistent_systems

Conclusion

Choosing the right partner for legacy system modernization in India can feel like a big decision, especially when so much of your business still runs on systems that have been around for years. What stands out after looking at the options is how different companies approach the same challenge – some lean heavily into automation and cloud moves, while others focus on careful, low-risk steps that keep things running without drama. In the end, it really comes down to how well the partner understands your specific setup and the pace you need to move at.

The Indian market has plenty of solid choices, but success usually comes from finding someone who listens first and then matches the technology to your actual goals rather than pushing a one-size-fits-all plan. Whether you're dealing with mainframes, old .NET apps, or tangled databases, a good modernization project should leave you with something more flexible and easier to maintain – without turning your daily operations upside down. Take your time to compare approaches, ask the right questions, and pick the fit that feels practical for where your business is headed.