Outmoded technologies, high upkeep costs, along with limited scalability continue to impede innovation and as such legacy systems remain an essential part of many businesses. The critical aspect of modernising a company’s legacy code is to remain relevant in the digital transformation, as well as securing their long-term success.
The ascent of AI technologies such as Claude Code have made digitising a company’s legacy systems simpler to achieve than ever before by providing businesses with a means for evaluating legacy system codes, automating coding refactoring into their legacy systems, and migrating to new architecture.
Here is the complete list of the leading legacy software modernisation firms included in this article prior to more in-depth company profiles:
1) Cleveroad
2) Thoughtworks
3) Endava
4) Globant
5) Grid Dynamics
6) Nagarro
7) Persistent Systems
8) Coforge
9) Zensar Technologies
10) Softjourn
Table of Contents
Companies Using Claude Code to Transition from Legacy Systems
To compile the company list we worked with seasoned engineers researching the computer world through reputable sites (such as Clutch and goodfirms) to evaluate the overall success of each company regarding their ability to modernize, their use of AI technology, their customers’ satisfaction, and their standing within the industry among others.
1. Cleveroad
Cleveroad is a full-service software company that offers legacy systems modernization services, with particular expertise in modernizing legacy systems using AI-based technologies. They have experience using LLM technology for code refactoring, creating documentation and transforming systems. Their developers have extensive experience in migrating from the monolithic approach to utilizing multiple microservices and modernizing existing technology stacks including .NET, Java and PHP. They also build cloud native tools using AWS or Azure.
Cleveroad has an outstanding combination of knowledge and hands on experience in the process of developing regulated industries.They also continuously integrate AI tools into continuous integration and delivery (CI/CD) by providing faster code audits, helping to decrease technical debt, and increasing maintainability.
Cleveroad is an ISO 9001 and 27001 certified company, reflecting high quality and information security management systems in place.
2. Thoughtworks
Thoughtworks has pioneered contemporary software engineering practices worldwide. Their use of AI (such as Claude’s models) assists businesses with performing automated code re-engineering and decomposing legacy systems into modular components while also generating intelligent documentation about their IT systems.
Thoughtworks’ team focuses primarily on modernizing large-scale enterprise applications located in highly-regulated industries, like banks and government agencies, where there is a need to innovate while maintaining adherence to strict regulations.
Thoughtworks has consistently received numerous accolades throughout the years from both the Forrester Wave and other reports working within the software modernization space, making it one of the most respected authorities in the field of technology consulting and modern software development.
3. Endava
Endava focuses on Legacy Modernization through digital transformation by incorporating AI into their engineering practices as they redesign their customer’s legacy applications. They utilize A.I. throughout the transformation process for evaluating legacy systems, identifying potential areas for improvement, and automating any repetitive aspect of the transformation process.
Endava also has extensive experience assisting companies in modernizing their existing financial service or telecommunications infrastructure with Agile methodologies, ensuring the ability to make ongoing iterative improvements and gain insight into the next iteration of their development using AI.
Deloitte Technology Fast 500 has recognized Endava as one of the fastest growing companies in technology and continues to be regarded as experts in delivering scalable Solutions through the modernization of legacy systems for financial services and telecommunications companies.
4. Globant
Globant integrates AI and machine learning with software engineering workflows, such as modernising legacy systems, as part of their digital-native company vision. The company uses proprietary AI accelerators that complement tools like Claude, allowing them to improve understanding and transformation of code.
Globant’s focus is on modernising complex enterprise platforms, particularly in industries where performance and scalability are important (e.g., media and gaming). Globant’s “studios” model combines domain knowledge with advanced capabilities in AI.
The company has appeared on Fast Company’s “Most Innovative Companies” list multiple times, delivering continued leadership in AI-driven engineering.
5. Grid Dynamics
The focus of Grid Dynamics is AI and digital transformation. With their exceptional ability to develop and enhance current functions of existing commerce and data platforms (legacy), and with their ability to leverage machine learning through AI, they can automate the migration of code, optimize code performance, and develop technical documentation, which is what they do using AI tools such as Claude.
With their extensive experience with data-centric infrastructures, they excel in modernizing existing analytics and recommendation engines.
Cloud-native rearchitecting using Kubernetes and microservices is another area they excel at. They have gained recognition for their ability to produce world-class engineering, and consequently, many leading cloud service providers (including AWS and Google Cloud) have become partners with them.
6. Nagarro
As a global provider of digital engineering, Nagarro has been providing solutions for customers involving Legacy System Transformation and Artificial Intelligence-based Development for quite some time now. They leverage advanced Large Language Models (LLMs) to help refactor code, automate the testing of software, and create better documentation for systems.
With its “Thinking Breakthroughs” philosophy, Nagarro combines Innovative thoughts and ideas with practical means of engineering to drive value (innovate) for their Customers, delivering value and driving modernization capabilities through Legacy ERP and CRM modernizations for Large Enterprises.
Nagarro has gained multiple certifications and accolades regarding its capabilities and Agile, Scalable Delivery capabilities.
7. Persistent Systems
Persistent Systems provides software product engineering and enterprise modernization, using Artificial Intelligence (AI) tools to help speed up the transformation of legacy systems (e.g., converting them to modernized, cloud-based systems). Persistent’s teams utilize AI for code analysis, migration planning and automated refactoring of existing codebases.
They also have deep experience with migrating to the cloud and providing API enablement services, allowing companies to modernize their existing legacy systems into scalable, service-oriented architectures.
Persistent Systems has been recognized in numerous Gartner Magic Quadrants and has received several awards for innovation in its industry.
8. Coforge
Coforge is a leading provider of digital services that incorporate artificial intelligence and Machine Learning technologies to modernize its clients’ legacy systems in highly regulated industries. As a result, Coforge has developed and utilized many artificial intelligence tools and products to help users improve code quality, decrease technical debt, and shorten conversion timeframes.
With deep domain knowledge of both travel and insurance businesses, Coforge has extensive experience in working with large, complex legacy ecosystems. In addition, Coforge has strong emphasis on automation and data-driven decision making to aid in the modernization process on behalf of its clients.
Coforge has received numerous awards for industry recognition and also maintains a strong global partnership network to support its clients.
9. Zensar Technologies
Zensar Technologies provides experience-led engineering services, such as AI powered legacy modernization to support code transformation, maintainability improvements and cloud migrations by automating code transformations with AI models.
Zensar Technologies also has very strong experience working in both retail and manufacturing where legacy systems have oftentimes needed to be modernized in order to better support digital commerce and optimize supply chain.
Zensar Technologies is part of the RPG Group and has recently been recognized for inovation in digital engineering.
10. Softjourn
Softjourn provides technological services that specialize in legacy modernisation and AI powered development. Using tools such as Claude, they can help automate documentation, refactor code and develop scalable systems.
They are particularly strong in verticals such as fintech and media; both require modernising technology solutions to scale effectively as transactional volumes and end-user engagement increase.
Softjourn’s engineering professionals develop secure, compliant and scalable technology solutions.
Clutch ranks them very highly, and their clients agree that they are a client-centric and technically competent services provider.
Conclusion
To survive in a world where agility, security, and competitiveness are paramount, businesses can no longer ignore the need to modernize their existing systems. Companies that utilize modern technologies like the Claude Code AI technology have the ability to accelerate their transformation processes, lower their technical debt, and increase the overall performance of the system.
The above-listed organizations have demonstrated an ability to successfully combine AI-driven development techniques with proven modernization techniques. While the choice of partner will be determined by your desired result, your industry requirements, as well as the level of complexity of your existing systems, each organization will have the appropriate capabilities to help you transform your business.
