Legacy software can remain vital for business long after its original architecture, programming languages, and infrastructure have become hard to support. Modernized technology solutions increasingly imply integration of AI: organizations want to have clean data sources, cloud-based architectures, up-to-date APIs, automated delivery pipes, and software that can run generative and agentic AI.
The legacy modernization agencies mentioned in this article help provide application evaluation, code conversion, cloud transition, architecture renewal, and data modernization. It should be noted that this is not a ranking of service providers. Instead, it is a list that offers various agencies with long experience in legacy modernization, relevant qualifications, good tech potential, and background references.
How we selected these legacy modernization companies
The process of how we chose the legacy modernization firms
In order to be in official development, during the choosing period, the pool for research included more than sixty software engineering and digital transformation companies that could be included in reports such as Clutch, GoodFirms, DesignRush, ISG Provider Lens, Everest Group evaluations, technical documents, case studies, and partner directories.
The evaluation approach was built together with professionals who worked in the area of software architecture, cloud engineering, DevOps, database engineering, and AI/ML implementation. It was very important to have specialists in order to find out that AI-supporting modernization is not only the change of the old framework. One should also take into considerations such aspects as architecture, data funds, connections, infrastructure, security and delivery methods.
Leading legacy modernization companies for 2026
Comparing application and enterprise tech transformation providers resulted in the selection of leading legacy modernization firms below.
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Cleveroad
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Endava
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Persistent Systems
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Grid Dynamics
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Coforge
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Nagarro
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Zensar Technologies
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Hexaware Technologies
Though they differ substantially in terms of size and the way they deliver their solutions, the companies listed below apply the skills required for software modernization together with cloud, data, automation, or AI technologies necessary for creating AI-compatible enterprise environments.
Founded: 2011
Headquarters: Claymont, USA
Core modernization focus: Legacy application modernization, cloud migration, architecture transformation, AI integration
Key industries: Healthcare, FinTech, Logistics, Education, Retail, Media
Cleveroad is a legacy software modernization firm engaged in the full process of legacy software modernization that includes technical auditing, architecture modification, application refactoring, technology stack evolution, migration to the cloud, conversion of data, API creation, and implementation of AI technologies for existing products. The strategy used in modernization may focus on breaking monolithic architecture into modular or microservices-oriented ones, moving workloads to the cloud infrastructure, improving the CI/CD methodology of the project, and preparing legacy data and business logic for LLM and RAG application. The sectors home to the organization's clients include healthcare, finance, logistics, education, retail, and others as legacy software constantly implies complicated integrations and regulations. Cleveroad has both ISO 9001 and ISO 27001 certifications and the AWS Select Tier Partner badge. Its modernization services section mentions Clutch 1000 and other Clutch awards. As of September 2026, Cleveroad’s Clutch profile had collected 81 reviews with an overall rating of 4.9 out of 5.
2. Endava
Founded: 2000
Headquarters: London, United Kingdom
Core modernization focus: Core system modernization, cloud transformation, architecture redesign, AI-enabled modernization
Key industries: Banking, payments, insurance, healthcare, automotive, telecommunications
Endava is involved in changing old but important systems for organizations and convert them into advanced digital systems. Its Dava.X Core Modernisation solution applies the data utilization perspective to study the histories of applications, workflows, dependencies, and technical characteristics to choose the right path for the transformation. It says that this approach was duly employed for more than 100 clients, 300 systems, and half a billion code lines. The company is also advanced in the sphere of its earlier developed Agentic AI Virtual SME solutions. The company has experience in the sphere of banking, payment, insurance, aviation, medical, automotive, and other industries of companies possessing core systems.
3. Persistent Systems
Founded: 1990
Headquarters: Pune, India
Core modernization focus: Product modernization, cloud-native transformation, data modernization, AI-led engineering
Key industries: Banking, healthcare, life sciences, insurance, software, telecommunications
With over a series of decades experience in software engineering, Persistent Systems offers cloud-native and AI-led modernization services. The mastery of product modernization draws on its extensive knowledge of microservices, API-first design, containerization, Kubernetes, MACH architectures, cloud transformation, and modern software engineering practices to replace or gradually modernize legacy products. The company relies on AI-led engineering to consult on platform modernization, intelligent operations, and enterprise data transformation. This approach helps companies modernize their technology base, ensuring its relevance, easy use, and adaptability to AI. Persistent Systems are recognized as experts in banking and finance, healthcare, life sciences, insurance, software, and telecommunications. It has a number of certifications such as ISO 9001, ISO 27001, ISO 27017, ISO 13485, SOC 2 Type II, CMMI Development Maturity Level 5, and ISO 42001 for AI management systems. In 2026, Everest Group named the company a Leader and Star Performer in Software Product Engineering Services, while Google Cloud honored it as the Partner of the Year in AI-led supply chain transformation.
4. Grid Dynamics
Founded: 2006
Headquarters: San Ramon, California, USA
Core modernization focus: Application modernization, cloud-native transformation, AI-powered SDLC, microservices migration
Key industries: Retail, technology, financial services, healthcare, manufacturing
Grid Dynamics specializes in large-scale modernization that involves decomposition of monolithic applications, microservices, use of Kubernetes, containers, and cloud-native data platforms, DevOps, automated testing and continuous deployment processes. The company has many years of experience in modernizing application portfolios of Fortune 1000 companies. Recently, the company has used artificial intelligence in the modernization process. For example, in one healthcare modernization project, Grid Dynamics has implemented AI-enabled SDLC when migrating the application from .NET 4.5 monolith to microservices in Azure. The team rewrote 23,000 lines of legacy code implementing test coverage from 0 to 58%. In 2026, the company has launched an AI native modernization service provided on Microsoft Azure and has received the MACH Alliance Agent Ready Award for production level agent AI. The company has experience in working within such industries as retail, financial services, technology, healthcare, and manufacturing. According to recent data, as of June 30, 2026 the company has 4,838 employees.
5. Coforge
Founded: 1992
Headquarters: Greater Noida, India
Core modernization focus: Agentic AI-assisted modernization, cloud migration, data modernization, legacy code transformation
Key industries: Banking, insurance, travel, healthcare, public sector, high-tech
Coforge uses a mix of cloud engineering, data conversion, automation, and intelligent AI to modernize their processes. The Technology Modernization branch of Coforge employs the Forge-X platform and specially-made agents in order to guarantee modernization while ensuring traceability and compliance with enterprise architecture. The more extensive modernization solution of Coforge encompasses such services as application rationalization, AI-based code refactoring, moving from the mainframe to the cloud, and modernization of the legacy applications and data storage. Coforge has profound experience in banking and financial specialists’ services, insurance, tourism, and public services. HFS acknowledges Coforge as an innovator in the area of legacy application modernization services, while Everest Group gives it the title of a leader in digital transformation.
6. Nagarro
Founded: 1996
Headquarters: Munich, Germany
Core modernization focus: Application modernization, cloud migration, digital engineering, AI-enabled transformation
Key industries: Automotive, manufacturing, financial services, retail, healthcare, telecommunications
Nagarro aids businesses in legacy transformation through application portfolio assessment, modernizing architecture, migrating to cloud, engineering platform, DevOps, modernizing data as well as intelligent automation. Its digital engineering model is particularly suited for businesses that are slowly upgrading their entire application estate from rigid legacy legacy environment to APIs, microservices, containers and sophisticated cloud environments as well as AI applications. Nagarro operates in the fields of automotive industry, industrial production, finance organization, healthcare sector, retail, telecommunications and others where modernization needs to take into account complex systems of operation and large amounts of historical data. The notion of success of its modernization programs was proved in February 2026 when Nagarro received AWS Migration and Modernization Competency. AWS gives such competency to its partners to show that they have the required level of knowledge and have proven successful experience in application migration and modernization.
7. Zensar Technologies
Founded: 1963
Headquarters: Pune, India
Core modernization focus: Legacy application transformation, GenAI-assisted code modernization, cloud engineering, enterprise application modernization
Key industries: Banking, insurance, retail, manufacturing, technology, telecommunications
Zensar utilizes application modernization in combination with generative AI, cloud engineering, automation, and data transformation. Its projects help to showcase how such capabilities are used in tandem: according to the company, it has obtained relevant contracts which included legacy modernization in treasury and risk areas using GenAI solution in cooperation with global FinTech organization as well as the AI-powered initiative related to payment channels modernization for a large African bank. In addition, Zensar supports ongoing efforts in application transformation, platform engineering, cloud migrations, digital workplace modernization, and infrastructure services. Presently, Zensar works with more than 145 clients and has over 10,000 employees positioned in more than 30 countries. The company's industry experience concerns such fields as banking, insurance, retail, production, technology, telecommunications.
8. Hexaware Technologies
Founded: 1990
Headquarters: Mumbai, India
Core modernization focus: Mainframe modernization, GenAI-powered legacy transformation, cloud migration, automated software engineering
Key industries: Banking, insurance, healthcare, travel, manufacturing, retail, technology
Hexaware has developed an exceptionally robust AI-assisted modernization portfolio based around four leading platforms: RapidX, Agentverse, Tensai, and Zerovity. RapidX uses AI generated text in refactoring, code transformation, documentation, etc., whereas Zerovity assesses relationships, business logic, dependencies, and technology obsolescence within legacy systems before modernization. Its methodology embraces discovery, ROI assessment, rehosting, reengineering, rewriting, refactoring, replacement, cloud conversion, and AI testing under human control. In 2026, ISG recognized Hexaware as a Leader in Application Modernization Services among U.S. Mainframes Services and Solutions after drawing attention to GenAI-driven modernization and enterprise AI agents. Hexaware collaborates actively with businesses from bank, insurance, healthcare, manufacturing, travel, retail, and IT industries. Hexaware has won seven 2026 Stevie Awards at the American Business Awards, including in the area of AI innovations.
What AI-powered legacy modernization should include
AI technologies have the potential to speed up modernization processes, yet the mere presence of coding assistance within execution processes cannot solve the long-standing problems with architecture and technology. To succeed in transforming a business organization, enterprises need to focus on interdependencies between apps, embedded business rules, info structures, weighting, constraints, specifications for security matters, and business activities supported by the existing system.
Generative AI technology may assist software engineers carry out the following tasks: clarifying registered legacy codes, creating documentation for apps, developing tests, analyzing dependencies, finding ways for refactoring codes, finding the necessary means for translating codes into the desired programming languages, and discovering the unnecessary components of codes. Agentic AI will help to advance the task of coordinating multilevel modernization tasks by following them and retaining contextual knowledge about numerous app estates.
Therefore, companies assessing the services provided by organizations engaged in legacy modernization must focus on the knowledge and experience of the provider in a certain programming language. The organization should know software architecture, as well as cloud platforms and enterprise data.
Final thoughts
Legacy modernization has transformed from being primarily an infrastructure-centric initiative into a more broad and comprehensive software transformation discipline. In this regard, cloud technologies, generative AIs, automated engineering tools and agent-specific workflows allow for analyzing and transforming complicated software estates much differently than it used to be done within traditional manual modernization approaches.
The eight firms being analyzed here in detail in this paper include Cleveroad, Endava, Persistent Systems, Grid Dynamics, Coforge, Nagarro, Zensar Technologies and Hexaware Technologies, which offer different ways of merging traditional approach to modernization engineering with contemporary opportunities offered by AI, cloud technologies, automation and data capabilities.
As this is only a curated list and not a ranking, the choice of a relevant provider strongly relies on the current technology stack in use, complexity of the system, specific requirements of the industry, scope of the transformation, cloud strategy, availability of internal engineering resources and anticipated role of AI in future software architecture.