Category: Mainframe Migration

Introduction You are about to rebuild a mainframe application that has run your organization for 30 years, and here is what most teams underestimate going in: the rebuild is not the hard part. Knowing what you are replacing is. A mainframe estate holds thousands of business rules. They are spread across legacy languages it was […]

This post is co-written with Reshma Nuggehally, Jai Bagmar and Kanai Lal Dutta from Accenture Background: Organizations running mainframes face a critical challenge: 90% are pursuing cloud modernization, yet organizations have transitioned fewer than 20% of workloads. Rising operating costs, retiring talent, and rigid architectures demand a fundamentally different approach. In this post, we explore how […]

AWS Transform for mainframe replatform is a migration service that helps organizations accelerate the modernization of their mainframe workloads to AWS. As organizations pursue their mainframe modernization journey, migrating mainframe systems to AWS has become a strategic imperative. The service provides an end-to-end automated migration pathway, including tooling, guidance, and self-managed runtime environments with Rocket […]

Your mainframe applications encode decades of critical business logic in COBOL and PL/I. That logic processes millions of transactions daily, and it is a valuable asset. But the business demands around that logic are changing faster than the legacy applications can adapt. A bank launching new digital products needs event-driven processing across every channel, not […]

Introduction Many enterprises worldwide depend on PL/I mainframe applications to run critical operations like banking, insurance claims, and government services. PL/I accounts for roughly 5% of all applications, (Leverage Compilation Technology to Optimize Investment on System z) primarily in financial services, insurance, and public sector, proving remarkably resilient over decades. However, organizations face growing challenges […]

Many enterprises have used the mainframe as a platform of choice for their core business processing over decades. The simplicity and speed of initial development in monolithic architecture have consequently resulted in the creation of large (10M+ LOC) and exceptionally large (100M+ LOC) mono-repos and complex codebases. When customers are ready to modernize these applications, […]

Mainframe modernization is necessary for enterprises to increase agility, reduce costs, innovate, and mitigate business risks. Yet organizations face a significant hurdle during modernization: testing is critically important to validate modernized applications behavior, but it typically consumes more than half of project timelines and resources. As enterprises race to modernize their legacy systems, this testing […]

AWS Transform, launched in May 2025, is the first agentic AI service for modernizing mainframe workloads at scale. The AI-powered mainframe agent accelerates mainframe modernization by automating complex, resource-intensive tasks across every phase of modernization from initial assessment to final deployment. You can streamline the migration of legacy mainframe applications, including COBOL, JCL, CICS, Db2, […]

Sessions, workshops, blogposts, and breakthrough announcements Mainframe modernization is critical imperative for enterprises seeking to reduce costs and improve agility, yet traditional approaches to modernization face significant challenges including navigating complex legacy codebases, incomplete or missing system documentation, and the scarcity of specialized mainframe expertise due to a retiring workforce. Generative AI and Agentic AI […]

In this blog post, we outline the AWS approach to modernizing mainframe legacy applications through the reimagine pattern, showcasing how organizations can transform legacy COBOL applications into modern, cloud-native architectures. Organizations are facing urgent imperatives to modernize their legacy mainframe applications due to talent shortages, increasing costs, and restrictions on business agility. AWS supports multiple […]