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Top 10 Legacy System Modernization Companies in 2026
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techiehungerPublished on
As businesses accelerate their digital transformation initiatives, legacy systems have become one of the biggest obstacles to innovation, scalability, and operational efficiency. Outdated applications often struggle to integrate with modern technologies, increase maintenance costs, and expose organizations to security and compliance risks. Rather than replacing these systems entirely, many organizations are choosing legacy system modernization to extend the value of their existing investments while adopting cloud-native technologies, AI, automation, and modern application architectures.
However, selecting the right modernization partner is just as important as choosing the right modernization strategy. The ideal company should not only have deep technical expertise but also understand your industry, business processes, security requirements, and long-term digital transformation goals.
To help you make an informed decision, we’ve compiled a list of the top legacy system modernization companies. This guide evaluates each company based on its modernization capabilities, technology expertise, industry experience, and ability to deliver scalable, future-ready solutions for enterprises worldwide.
How We Selected the Top Legacy Modernization Companies
Choosing the right legacy modernization partner requires more than comparing company size or years in business. The most successful modernization providers combine technical expertise, industry knowledge, proven delivery capabilities, and a customer-centric approach to help organizations transform complex legacy environments with minimal business disruption.
For this list of the legacy software modernization companies, we evaluated providers using the following criteria:
Technical Expertise
We assessed each company’s capabilities in legacy application modernization, cloud migration, application re-engineering, API integration, microservices architecture, containerization, DevOps, and enterprise application development.
Industry Experience
Modernization requirements vary across industries such as banking, healthcare, manufacturing, retail, insurance, logistics, and government. We prioritized companies with proven experience delivering modernization projects across multiple industry verticals.
Technology Partnerships and Ecosystem
Organizations with strong partnerships with leading technology providers such as Microsoft Azure, Amazon Web Services (AWS), Google Cloud, and other enterprise platforms were given preference due to their ability to deliver scalable and future-ready solutions.
End-to-End Modernization Services
The companies included in this list offer comprehensive modernization services—from legacy system assessment and strategy to application modernization, cloud migration, integration, testing, deployment, and ongoing support.
Innovation and Emerging Technologies
We considered each company’s ability to leverage modern technologies such as artificial intelligence (AI), automation, analytics, cloud-native development, and low-code platforms to accelerate modernization initiatives and deliver greater business value.
Client Success and Market Reputation
Our evaluation also considered customer success stories, enterprise project experience, market presence, industry recognition, and overall reputation for delivering successful modernization engagements.
Global Delivery and Support Capabilities
Since many organizations require distributed development teams and long-term support, we also assessed each company’s global delivery model, scalability, and ability to support enterprise clients across different regions.
By evaluating these factors, we’ve created a balanced list of companies that consistently demonstrate the expertise, reliability, and innovation needed to help businesses modernize legacy systems and achieve long-term digital transformation goals.
Comparison Table: Top Legacy Application Modernization Companies in 2026
Every organization has a different modernization roadmap. Some enterprises need to migrate decades-old mainframe applications, while others are looking to re-architect monolithic systems into cloud-native applications or modernize complex ERP ecosystems. As a result, choosing the right modernization partner depends on your existing technology landscape, industry requirements, and long-term digital transformation goals.
The comparison below highlights ten globally recognized legacy system modernization companies based on their modernization expertise, enterprise capabilities, industry specialization, and ideal use cases. Consider it a starting point to identify vendors whose strengths best align with your business objectives.
| Company | Headquarters | Core Modernization Expertise | Industries Served | Best For |
| IBM Consulting | United States | Mainframe modernization, hybrid cloud transformation, AI-assisted code modernization, application modernization | Banking, Insurance, Government, Healthcare | Large enterprises with IBM Z, COBOL, or mission-critical legacy systems |
| Accenture | Ireland | Enterprise application modernization, cloud migration, digital engineering, AI-enabled transformation | Banking, Retail, Healthcare, Telecom, Manufacturing | Global organizations executing enterprise-wide modernization initiatives |
| Capgemini | France | Legacy application transformation, cloud-native modernization, ERP modernization, digital engineering | Manufacturing, Automotive, Energy, Financial Services | Enterprises modernizing complex enterprise applications and ERP environments |
| Cognizant | United States | Application modernization, cloud migration, DevOps, legacy platform transformation | Healthcare, Banking, Life Sciences, Retail | Organizations modernizing large application portfolios while improving operational efficiency |
| Infosys | India | Legacy application modernization, cloud engineering, automation, enterprise migration | BFSI, Manufacturing, Retail, Telecommunications | Enterprises seeking structured modernization programs with global delivery capabilities |
| Tata Consultancy Services (TCS) | India | Mainframe modernization, application re-engineering, cloud transformation, enterprise modernization | Banking, Insurance, Retail, Manufacturing | Large-scale modernization projects involving complex enterprise ecosystems |
| HCLTech | India | Mainframe modernization, cloud migration, infrastructure modernization, application transformation | Financial Services, Manufacturing, Healthcare, Telecom | Enterprises migrating mission-critical legacy applications to hybrid cloud environments |
| EPAM Systems | United States | Software modernization, cloud-native engineering, platform modernization, digital product engineering | Financial Services, Healthcare, Media, Travel | Organizations focused on modern software architecture and digital product transformation |
| Wipro | India | Legacy modernization, application migration, cloud transformation, automation services | Banking, Energy, Retail, Manufacturing | Enterprises seeking cost-effective modernization with strong cloud capabilities |
| NTT DATA | Japan | Enterprise modernization, cloud migration, application transformation, systems integration | Government, Healthcare, Manufacturing, Financial Services | Organizations requiring global modernization expertise with strong integration capabilities |
This high-level comparison provides a quick snapshot of each provider’s strengths. In the next section, we’ll take a closer look at each company, exploring its modernization capabilities, technology expertise, industry focus, and the scenarios where it delivers the greatest value.
Top 10 Legacy System Modernization Companies in 2026
1. IBM Consulting
IBM Consulting is one of the world’s leading providers of legacy system modernization services, helping enterprises transform aging applications into secure, scalable, and cloud-ready platforms. With decades of experience managing mission-critical IT environments, IBM specializes in modernizing mainframes, enterprise applications, and complex software ecosystems while minimizing business disruption. Its modernization strategy combines hybrid cloud, artificial intelligence (AI), automation, and application transformation to help organizations reduce technical debt and accelerate digital innovation.
Rather than recommending a one-size-fits-all approach, IBM evaluates an organization’s existing technology landscape to determine the most effective modernization strategy. Depending on business needs, this may include rehosting, replatforming, refactoring, rearchitecting, rebuilding, or replacing legacy applications. The company also leverages AI-powered code analysis and automation to accelerate application assessments, code conversion, testing, and cloud migration while reducing project complexity and risk.
IBM serves organizations across banking, insurance, healthcare, government, manufacturing, retail, and telecommunications. Through strategic partnerships with Microsoft, AWS, Google Cloud, Oracle, and Red Hat, the company delivers comprehensive modernization solutions that improve application performance, strengthen security, and support long-term digital transformation. For enterprises operating mission-critical legacy systems, IBM Consulting remains one of the most trusted modernization partners worldwide.
Headquarters
Armonk, New York, United States
Legacy Modernization Expertise
● Mainframe modernization
● Application modernization
● Hybrid cloud transformation
● AI-assisted code modernization
● Cloud migration
● Enterprise application transformation
Industries Served
Banking, Insurance, Government, Healthcare, Manufacturing, Retail, and Telecommunications
Best Suited For
Large enterprises operating mission-critical applications, especially IBM Z, COBOL, or other complex legacy systems that require secure, low-risk modernization.
2. Accenture
Accenture is a global technology consulting and professional services company that helps organizations modernize legacy applications while accelerating enterprise-wide digital transformation. Its approach goes beyond upgrading outdated technology by aligning modernization initiatives with broader business objectives, enabling organizations to improve operational efficiency, enhance customer experiences, and create scalable digital platforms for future growth.
The company specializes in transforming monolithic applications into cloud-native architectures using microservices, APIs, containerization, DevOps, and AI-driven engineering practices. Accenture’s modernization framework covers every stage of the transformation journey, including application assessment, modernization planning, cloud migration, platform engineering, automation, and continuous optimization. By integrating artificial intelligence and automation throughout the modernization lifecycle, the company helps reduce technical debt while improving application scalability, resilience, and development speed.
Accenture has extensive experience delivering modernization projects across banking, healthcare, retail, manufacturing, telecommunications, energy, and public sector organizations. Its strategic alliances with Microsoft, AWS, Google Cloud, SAP, Oracle, and Salesforce enable clients to modernize complex enterprise systems while adopting the latest cloud and AI technologies. Its combination of business consulting, engineering expertise, and global delivery capabilities makes Accenture one of the preferred partners for large-scale legacy modernization initiatives.
Headquarters
Dublin, Ireland
Legacy Modernization Expertise
● Enterprise application modernization
● Cloud migration
● Cloud-native application development
● Digital engineering
● AI-enabled modernization
● DevOps transformation
Industries Served
Banking, Healthcare, Retail, Manufacturing, Telecommunications, Energy, and Public Sector
Best Suited For
Global enterprises looking to modernize large application portfolios while aligning technology transformation with long-term business strategy.
3. Capgemini
Capgemini is a globally recognized technology consulting and engineering company that helps organizations modernize legacy systems, accelerate cloud adoption, and improve enterprise agility. With decades of experience in digital transformation, the company enables businesses to transform outdated applications into secure, scalable, and cloud-ready solutions without disrupting critical business operations.
Its modernization approach combines application assessment, modernization strategy, cloud migration, platform engineering, API integration, DevOps, and automation to simplify complex transformation initiatives. Capgemini has extensive expertise in modernizing enterprise applications, ERP platforms, and mainframe environments while preserving valuable business logic accumulated over years of operation. The company also emphasizes cloud-native development, helping organizations adopt modern architectures that improve performance, security, scalability, and long-term maintainability.
Capgemini serves clients across manufacturing, automotive, financial services, energy, retail, consumer products, and the public sector. Through partnerships with Microsoft, AWS, Google Cloud, SAP, Oracle, and IBM, the company delivers modernization solutions tailored to industry-specific challenges and regulatory requirements. Its strong consulting capabilities, engineering expertise, and global delivery network make Capgemini an excellent choice for organizations seeking a strategic partner to modernize complex enterprise applications and accelerate digital transformation.
Headquarters
Paris, France
Legacy Modernization Expertise
● Legacy application modernization
● Cloud-native modernization
● ERP modernization
● Hybrid cloud engineering
● Application transformation
● Platform modernization
Industries Served
Manufacturing, Automotive, Financial Services, Energy, Retail, Consumer Products, and Public Sector
Best Suited For
Enterprises seeking industry-specific modernization expertise, cloud transformation capabilities, and end-to-end consulting support for complex legacy environments.
4. Cognizant
Cognizant is a leading global technology services company that helps enterprises modernize legacy systems while preparing their IT environments for cloud, AI, and digital transformation. Its legacy modernization practice focuses on transforming outdated applications into scalable, cloud-native platforms that improve operational efficiency, reduce maintenance costs, and accelerate innovation. Rather than simply migrating applications, Cognizant emphasizes reimagining legacy environments to support future business growth through its Human + AI approach.
The company offers end-to-end modernization services, including application portfolio assessment, legacy application transformation, cloud migration, API enablement, application reengineering, DevOps implementation, and AI-driven code modernization. Cognizant leverages automation and generative AI to analyze legacy codebases, identify modernization opportunities, and streamline migration with minimal business disruption. Its structured modernization methodology helps organizations preserve critical business logic while transitioning to modern architectures that are more agile, secure, and scalable.
Cognizant serves organizations across healthcare, banking, life sciences, retail, manufacturing, insurance, and telecommunications. The company also collaborates with major cloud providers, including Microsoft Azure, AWS, and Google Cloud, enabling clients to modernize applications using cloud-native technologies and AI-powered solutions. With deep industry expertise, global delivery capabilities, and a strong focus on innovation, Cognizant has established itself as one of the preferred modernization partners for enterprises looking to transform complex legacy application portfolios.
Headquarters
Teaneck, New Jersey, United States
Legacy Modernization Expertise
● Legacy application modernization
● Cloud migration
● Application reengineering
● AI-driven code modernization
● DevOps transformation
● API modernization
Industries Served
Healthcare, Banking, Life Sciences, Insurance, Retail, Manufacturing, and Telecommunications
Best Suited For
Organizations looking to modernize large application portfolios while leveraging AI and cloud technologies to improve agility, reduce technical debt, and accelerate digital transformation.
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5. Infosys
Infosys is one of the world’s leading digital services and consulting companies, helping enterprises modernize legacy systems through cloud, automation, artificial intelligence, and platform engineering. With decades of experience delivering enterprise technology solutions, Infosys enables organizations to transform outdated applications into modern, resilient, and cloud-ready systems that support continuous innovation and business growth.
Its modernization services cover the complete application lifecycle, from application discovery and portfolio assessment to cloud migration, application reengineering, microservices transformation, API integration, and modernization of enterprise platforms. Infosys follows a business-driven modernization approach that prioritizes preserving critical business processes while reducing technical debt and improving application performance. By incorporating automation and AI into modernization projects, the company accelerates application analysis, testing, code conversion, and deployment, enabling faster project execution with reduced operational risk.
Infosys has delivered modernization programs for enterprises across banking and financial services, manufacturing, retail, telecommunications, healthcare, energy, and logistics. Through strategic partnerships with Microsoft, AWS, Google Cloud, Oracle, SAP, and Salesforce, the company helps organizations adopt cloud-native architectures while integrating advanced analytics, AI, and automation into their business operations. Its combination of consulting expertise, engineering excellence, and global delivery capabilities makes Infosys a reliable modernization partner for organizations undertaking large-scale digital transformation initiatives.
Headquarters
Bengaluru, Karnataka, India
Legacy Modernization Expertise
● Application modernization
● Cloud migration
● Enterprise application transformation
● Microservices adoption
● API integration
● AI and automation-led modernization
Industries Served
Banking & Financial Services, Manufacturing, Retail, Telecommunications, Healthcare, Energy, and Logistics
Best Suited For
Large enterprises seeking scalable legacy modernization programs supported by strong cloud engineering, automation, and global delivery expertise.
6. Tata Consultancy Services (TCS)
Tata Consultancy Services (TCS) is one of the world’s largest IT services and consulting firms, providing comprehensive legacy system modernization services to enterprises across multiple industries. The company helps organizations transform aging applications into agile, cloud-enabled platforms that improve operational efficiency, enhance customer experiences, and support long-term business innovation. Its modernization strategy focuses on enabling continuous transformation rather than one-time technology upgrades.
TCS offers a broad portfolio of modernization services, including application portfolio rationalization, mainframe modernization, cloud migration, legacy application reengineering, API enablement, microservices transformation, and enterprise platform modernization. The company combines automation, artificial intelligence, DevSecOps, and cloud engineering to simplify complex modernization projects while minimizing operational risks. Its experience managing large-scale enterprise transformation initiatives enables organizations to modernize mission-critical systems without disrupting business continuity.
Serving industries such as banking, insurance, retail, manufacturing, telecommunications, healthcare, travel, and public services, TCS has extensive experience handling highly regulated and large-scale enterprise environments. Through strategic partnerships with Microsoft, AWS, Google Cloud, Oracle, SAP, and other leading technology providers, TCS delivers modernization solutions tailored to each organization’s digital transformation objectives. Its strong global presence, engineering capabilities, and enterprise consulting expertise make TCS a trusted partner for organizations seeking sustainable and future-ready legacy modernization solutions.
Headquarters
Mumbai, Maharashtra, India
Legacy Modernization Expertise
● Mainframe modernization
● Legacy application transformation
● Cloud migration
● Enterprise application modernization
● API enablement
● Microservices transformation
Industries Served
Banking, Insurance, Retail, Manufacturing, Healthcare, Telecommunications, Travel, and Public Sector
Best Suited For
Large enterprises managing complex legacy environments that require end-to-end modernization, cloud transformation, and long-term technology modernization strategies.
7. HCLTech
HCLTech is a global technology company with deep expertise in legacy system modernization, helping enterprises transform outdated applications into AI-ready, cloud-native, and resilient digital platforms. Its modernization strategy focuses on preserving existing business logic while reducing technical debt, improving application performance, and enabling organizations to adopt modern technologies with minimal business disruption. Rather than relying on large-scale system replacements, HCLTech promotes an incremental modernization approach that allows enterprises to modernize applications based on business priorities and long-term digital transformation goals.
The company’s application modernization services span the entire modernization lifecycle, including application portfolio assessment, legacy application transformation, mainframe modernization, cloud migration, application replatforming, API enablement, and cloud-native development. HCLTech also leverages Generative AI and Agentic AI to automate code analysis, dependency mapping, documentation, and modernization planning. This AI-driven approach helps organizations gain better visibility into complex application landscapes while accelerating modernization projects with reduced risk and improved governance.
HCLTech serves enterprises across financial services, manufacturing, healthcare, telecommunications, retail, and public sector organizations. Supported by strategic partnerships with Microsoft, AWS, Google Cloud, IBM, Oracle, and SAP, the company delivers modernization solutions that improve scalability, operational resilience, and business agility. Its strong engineering capabilities, AI-powered modernization framework, and experience handling large enterprise environments make HCLTech a trusted partner for organizations seeking long-term application modernization.
Headquarters
Noida, Uttar Pradesh, India
Legacy Modernization Expertise
● Application modernization
● Mainframe modernization
● Cloud migration
● AI-driven application transformation
● Cloud-native engineering
● Application portfolio modernization
Industries Served
Financial Services, Manufacturing, Healthcare, Telecommunications, Retail, and Public Sector
Best Suited For
Large enterprises seeking AI-powered legacy modernization while modernizing mission-critical applications with minimal operational disruption.
8. EPAM Systems
EPAM Systems is a global digital engineering and software development company known for helping enterprises modernize legacy applications through cloud-native engineering, platform modernization, and digital product transformation. Unlike traditional IT service providers, EPAM combines software engineering expertise with consulting services to help organizations redesign legacy systems into scalable, high-performance digital platforms that support continuous innovation.
Its modernization services include application assessment, cloud migration, application reengineering, microservices adoption, API development, DevOps implementation, platform engineering, and modernization of enterprise software ecosystems. EPAM places strong emphasis on modern software architecture, enabling businesses to replace monolithic applications with modular, cloud-native systems that improve scalability, resilience, and development speed. The company also integrates automation and AI into software modernization projects to accelerate delivery while maintaining code quality and reducing technical debt.
EPAM serves clients across financial services, healthcare, life sciences, media, retail, travel, and technology industries. With strategic partnerships spanning Microsoft Azure, AWS, Google Cloud, Salesforce, SAP, and other enterprise platforms, the company helps organizations modernize applications while improving customer experiences and operational efficiency. Its engineering-first culture, agile delivery model, and expertise in digital product development make EPAM an excellent choice for organizations seeking innovation-driven legacy modernization.
Headquarters
Newtown, Pennsylvania, United States
Legacy Modernization Expertise
● Software modernization
● Cloud-native engineering
● Platform modernization
● Microservices transformation
● Application reengineering
● DevOps implementation
Industries Served
Financial Services, Healthcare, Life Sciences, Retail, Media, Travel, and Technology
Best Suited For
Organizations looking to modernize legacy applications while building cloud-native digital products and scalable software platforms.
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9. Wipro
Wipro is a leading global IT consulting and technology services company that helps organizations modernize legacy applications through cloud transformation, automation, artificial intelligence, and modern software engineering. Its application modernization services are designed to help businesses maximize the value of existing technology investments while transitioning to agile, cloud-enabled architectures. Wipro’s approach focuses on minimizing modernization risks, reducing operational costs, and enabling organizations to respond faster to evolving business demands.
The company provides end-to-end modernization capabilities, including legacy application assessment, application replatforming, cloud migration, microservices implementation, API modernization, application rationalization, and modernization of enterprise platforms. Wipro also leverages AI, automation, and cloud-native development practices to simplify complex migration projects and accelerate application transformation. Its modular modernization methodology enables enterprises to modernize systems incrementally without disrupting ongoing business operations.
Wipro serves organizations across banking, insurance, healthcare, manufacturing, retail, energy, telecommunications, and consumer industries. Through partnerships with Microsoft, AWS, Google Cloud, Oracle, SAP, and Salesforce, the company delivers modernization solutions that improve scalability, strengthen security, and support long-term digital transformation. With extensive global delivery capabilities and decades of enterprise consulting experience, Wipro remains a reliable modernization partner for organizations looking to future-proof their application landscape.
Headquarters
Bengaluru, Karnataka, India
Legacy Modernization Expertise
● Legacy application modernization
● Cloud migration
● Application replatforming
● Microservices implementation
● API modernization
● Cloud-native transformation
Industries Served
Banking, Insurance, Healthcare, Manufacturing, Retail, Energy, Telecommunications, and Consumer Industries
Best Suited For
Enterprises seeking a cost-effective, cloud-first modernization strategy supported by automation, AI, and scalable engineering expertise.
10. NTT DATA
NTT DATA is a global IT services and consulting company that helps enterprises modernize legacy systems by combining deep industry expertise with cloud technologies, application engineering, and digital transformation services. The company focuses on helping organizations replace outdated, siloed applications with modern, connected, and scalable enterprise platforms that improve operational efficiency and accelerate innovation. Its modernization strategy balances business continuity with technology evolution, allowing organizations to modernize critical applications without disrupting day-to-day operations.
NTT DATA provides comprehensive modernization services, including application portfolio assessment, legacy application transformation, cloud migration, enterprise integration, API development, application reengineering, and modernization of business-critical systems. The company also incorporates automation, AI, DevOps, and cloud-native development practices into modernization projects to reduce delivery timelines and improve long-term maintainability. Its consulting-led approach helps organizations create modernization roadmaps aligned with business objectives, compliance requirements, and future growth plans.
The company serves clients across financial services, healthcare, manufacturing, government, telecommunications, automotive, and retail industries. Through strategic alliances with Microsoft, AWS, Google Cloud, SAP, Oracle, and ServiceNow, NTT DATA delivers scalable modernization solutions tailored to enterprise environments. Its strong global delivery network, industry knowledge, and end-to-end consulting capabilities make it a trusted modernization partner for organizations navigating complex digital transformation initiatives.
Headquarters
Tokyo, Japan
Legacy Modernization Expertise
● Enterprise application modernization
● Cloud migration
● Application transformation
● Systems integration
● API development
● Cloud-native modernization
Industries Served
Financial Services, Healthcare, Manufacturing, Government, Telecommunications, Automotive, and Retail
Best Suited For
Global enterprises requiring end-to-end legacy modernization, systems integration, and cloud transformation backed by strong industry consulting expertise.
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Conclusion
Modernizing legacy systems is no longer just an IT upgrade—it is a strategic investment that enables businesses to improve agility, strengthen security, reduce operational costs, and accelerate innovation. However, the success of any modernization initiative largely depends on choosing a partner with the right technical expertise, industry knowledge, and proven delivery capabilities. The companies featured in this list have consistently demonstrated their ability to help organizations transform complex legacy environments into scalable, cloud-ready, and future-proof digital ecosystems. Before making your decision, evaluate your business objectives, existing technology landscape, compliance requirements, and long-term digital transformation goals to select a modernization partner that best aligns with your organization’s vision for growth.
FAQs
1. What is a legacy system modernization company?
A legacy system modernization company helps businesses upgrade outdated software, applications, and IT infrastructure using cloud migration, application reengineering, AI, and modern development practices to improve performance, security, scalability, and long-term business agility.
2. How do I choose the best legacy system modernization company?
Choose a company based on its modernization expertise, industry experience, cloud capabilities, technology partnerships, client success stories, security practices, and ability to deliver scalable solutions that align with your business objectives.
3. What are the benefits of legacy system modernization?
Legacy system modernization reduces maintenance costs, improves application performance, enhances cybersecurity, enables cloud adoption, supports AI integration, increases scalability, and helps businesses innovate faster while extending the value of existing systems.
4. Which industries benefit the most from legacy system modernization?
Industries such as banking, healthcare, manufacturing, retail, insurance, government, telecommunications, and logistics benefit significantly from legacy system modernization due to their reliance on mission-critical enterprise applications and evolving compliance requirements.
5. Why should businesses modernize legacy systems instead of replacing them?
Modernization preserves valuable business logic while reducing costs and implementation risks. It enables organizations to adopt modern technologies, improve operational efficiency, and accelerate digital transformation without completely rebuilding existing systems.