Google Cloud Mainframe Modernization powered by Gemini

Accelerate digital transformation with Google Cloud Mainframe Modernization

Modernize your mainframe applications with Google Cloud and unlock a new era of innovation, agility, and cost savings. Leverage our mainframe-specific agentic AI solutions, industry expertise, and robust partner ecosystem to accelerate your digital transformation journey from mainframe to Google Cloud.

Overview

Solutions for mainframe application reverse-engineering, assessment, de-risking and modernization

Proven solutions made by Google Cloud: assessment and reverse engineering of legacy mainframe applications using AI at scale, AI code transformation and application reimagination with agentic workflows, mainframe application augmentation with cloud capabilities, and de-risking the modernization application before going live.

Agentic AI mainframe modernization with Google Gemini models

Leverage Google's Gemini models and mainframe-specific modernization agents to extract business rules from the legacy codebase and transform your mainframe applications for the cloud. Google's agentic workflows support both code-to-code (AI Deterministic) and business logic-to-code (AI Generative) approaches and at real-world scale. With the power of Gemini infused with our mainframe-specific context and knowledge, you can now modernize faster, more confidently and at a lower cost.

Deploy on secure, reliable, scalable, and cost-effective cloud infrastructure

Deploy and operate your modernized mainframe applications on Google Cloud's secure, highly available, scalable, and cost-efficient infrastructure.

How It Works

Mainframe Modernization with AI and the cloud

AI is transforming mainframe modernization, turning a competitive necessity into an era of redefined possibilities. Watch our our Cloud Next '26 session to explore Google’s newest product breakthroughs and learn firsthand from SulAmérica about their journey using AI to transform the mainframe.

Mainframe Modernization at Cloud Next 2026
Mainframe Modernization at Cloud Next '26
Common Uses

Assess and Reverse Engineer mainframe applications

Mainframe Assessment Tool (MAT), powered by Gemini

Start your mainframe modernization journey with the Google Cloud Mainframe Assessment Tool (MAT), powered by Gemini models and mainframe-specific agentic workflows. MAT assesses and reverse-engineers your mainframe applications and data, generating a comprehensive knowledge base that includes business rules, automatic deep documentation of application logic, dependency insights and mapping and generated test cases, providing both explainability of your current mainframe applications and providing the foundation for powering agentic application modernization workflows.

    Mainframe Assessment Tool (MAT), powered by Gemini

    Start your mainframe modernization journey with the Google Cloud Mainframe Assessment Tool (MAT), powered by Gemini models and mainframe-specific agentic workflows. MAT assesses and reverse-engineers your mainframe applications and data, generating a comprehensive knowledge base that includes business rules, automatic deep documentation of application logic, dependency insights and mapping and generated test cases, providing both explainability of your current mainframe applications and providing the foundation for powering agentic application modernization workflows.

      Modernize mainframe application with Agentic AI workflows

      Mainframe Modernization Agents, powered by Gemini

      Accelerate mainframe application transformation with Gemini-powered agentic workflows, delivering agility, scalability and security while lowering cost and complexity.

      Google Cloud’s Mainframe Modernization Agents leverage purpose-built agentic workflows embedded with deep mainframe expertise to convert mainframe code into modern languages like Java or C#. Combined together with Google Antigravity, it bridges advanced Google AI and agentic capabilities with the complex and specific challenges of enterprise mainframe transformation projects.


        Mainframe Modernization Agents, powered by Gemini

        Accelerate mainframe application transformation with Gemini-powered agentic workflows, delivering agility, scalability and security while lowering cost and complexity.

        Google Cloud’s Mainframe Modernization Agents leverage purpose-built agentic workflows embedded with deep mainframe expertise to convert mainframe code into modern languages like Java or C#. Combined together with Google Antigravity, it bridges advanced Google AI and agentic capabilities with the complex and specific challenges of enterprise mainframe transformation projects.


          De-risk and test your modernized applications before going live

          Dual Run

          De-risk, test, and certify your mainframe modernization with Google Cloud Dual Run.

          With Dual Run, you can capture and replay live production traffic from your mainframe onto your modernized cloud application. By comparing outputs side-by-side, you ensure the correctness, completeness, and performance of your modernized applications throughout the modernization journey and before going live.


            Dual Run

            De-risk, test, and certify your mainframe modernization with Google Cloud Dual Run.

            With Dual Run, you can capture and replay live production traffic from your mainframe onto your modernized cloud application. By comparing outputs side-by-side, you ensure the correctness, completeness, and performance of your modernized applications throughout the modernization journey and before going live.


              Augment your mainframe with cloud-native capabilities

              Mainframe Connector

              Seamlessly integrate your mainframe data and applications with Google Cloud services using Google Cloud Mainframe Connector.

              Unlock previously siloed information and create powerful hybrid mainframe/cloud architectures. With Mainframe Connector, your legacy data becomes fully accessible within Google Cloud, allowing you to build new, cloud-native business functions right on top of your existing systems.

              By copying data directly from mainframe to Cloud and from Cloud back to mainframe, you can significantly reduce MIPS usage by leveraging cloud processing while keeping your existing mainframe applications intact.


                Mainframe Connector

                Seamlessly integrate your mainframe data and applications with Google Cloud services using Google Cloud Mainframe Connector.

                Unlock previously siloed information and create powerful hybrid mainframe/cloud architectures. With Mainframe Connector, your legacy data becomes fully accessible within Google Cloud, allowing you to build new, cloud-native business functions right on top of your existing systems.

                By copying data directly from mainframe to Cloud and from Cloud back to mainframe, you can significantly reduce MIPS usage by leveraging cloud processing while keeping your existing mainframe applications intact.


                  Replatform your mainframe applications "as-is"

                  Mainframe Application Replatforming

                  Replatform your mainframe applications to Google Cloud with automated solutions from our certified technology partners together with Google Cloud Dual Run for de-risking. With Replatforming, your mainframe applications can run "as-is" in Google Cloud preserving existing application functionality, substantially reducing costs migrating away from the mainframe, and boosting developer productivity with access to modern IDEs.

                  Read more about best practices in our Modernizing Mainframes with Rocket Enterprise Server and Google Cloud white paper.



                  Replatform Mainframe Modernization
                    Mainframe Application Replatforming

                    Replatform your mainframe applications to Google Cloud with automated solutions from our certified technology partners together with Google Cloud Dual Run for de-risking. With Replatforming, your mainframe applications can run "as-is" in Google Cloud preserving existing application functionality, substantially reducing costs migrating away from the mainframe, and boosting developer productivity with access to modern IDEs.

                    Read more about best practices in our Modernizing Mainframes with Rocket Enterprise Server and Google Cloud white paper.



                    Replatform Mainframe Modernization

                      Business Case

                      Learn more about how customers have successfully modernized mainframe applications using Google Cloud solutions

                      IntesaLogo

                      Intesa Sanpaolo Mainframe Modernization success story

                      Claudio Balbo, Head of IT Architecture at Intesa Sanpaolo

                      "To confidently move forward with Mainframe Modernization, we will need to provide confidence and assure the bank's leadership and internal control units as well as get approval from the regulators. One of the enablers for this is Google Cloud Dual Run, which is gradually providing the evidences to build such confidence to all three groups"

                      Customer success stories

                      Arek Oy leverages Anthos and other Google Cloud solutions with the help of partners Tietoevry, Accenture, and Heirloom to boost capacity for its core applications and improve pension management for customers.

                      Read more


                      BoaVista is able to leap forward with the company’s digital transformation journey, leveraging data analytics, reducing the time to ingest large volumes of data from 24+ hours to a few minutes and with a 9x increase in analytical models created.

                      Read more

                      UNITEC benefits from virtually infinite scalability on migrating eight servers, 22 zones, and 25 TB of data to Google Cloud in 24 days.

                      Read more

                      Start your Mainframe Modernization journey

                      Kickstart your Mainframe Modernization and unlock modernization insights. Start with a detailed assessment enhanced with generative AI capabilities. Identify opportunities to modernize and transform your legacy applications, reduce costs, innovate with new business functions, and accelerate agility.

                      Interested in learning more about Google Cloud solutions for Mainframe Modernization?

                      Learn more about Google Cloud’s Mainframe Modernization solutions for most in-demand modernization patterns, including code assessment, application code rewrite enhanced by generative AI, automatic code refactoring, testing, and augmentation of mainframe applications.

                      Use Google Gemini and Agentic AI to extract the business logic hidden in your mainframe applications, including automatic creation of code logic summaries, code documentation, test cases, application dependencies, and more. Understand your mainframe better and make informed modernization decisions using Google Mainframe Assessment Tool (MAT).

                      Unlock the full potential of your mainframe data and applications by augmenting them with Google Cloud capabilities and services. Seamlessly copy and use mainframe data with BigQuery, CloudSQL, AlloyDB and CloudRun using the Google Cloud Mainframe Connector, with automatic conversion of codepages, data types, and encodings between mainframe and non-mainframe formats.

                      Partners & Integration

                      Google Mainframe Modernization certified partners
                      • Accenture
                      • EPAM
                      • Kyndryl
                      • MO
                      • Thoughtworks
                      • Publicis Sapient
                      • Accenture
                      • EPAM
                      • Kyndryl
                      • MO
                      • Thoughtworks
                      • Publicis Sapient
                      • Accenture
                      • Capgemini
                      • Cognizant
                      • DXC Technology
                      • Deloitte
                      • HCL
                      • TCS
                      • kyndryl logo
                      • Wipro logo
                      • epam logo
                      • KPMG Logo
                      • Infosys Logo
                      • Publicis Sapient
                      • Rocket Software Logo
                      • MLogica Logo
                      • Precisely logo
                      • S software logo
                      • Tmaxsoft logo
                      • Heirloom Computing logo
                      • Stromasys logo
                      • Cast Logo
                      • Publicis Sapient

                      Our generative AI and implementation partners handle end-to-end project services, including scoping, implementation, and support. Our technology partners provide products and technologies for modernizing mainframe applications with Google Cloud.

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